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| author | Michele Simionato <michele.simionato@gmail.com> | 2015-03-16 12:19:26 +0100 |
|---|---|---|
| committer | Michele Simionato <michele.simionato@gmail.com> | 2015-03-16 12:19:26 +0100 |
| commit | d7d4bac90419a049165da9f29e2b8fef18fa7f33 (patch) | |
| tree | 1470060cdcf08596ffae6223c50871d0e8e95abe /documentation3.pdf | |
| parent | 5d0a05302b850386b2b71ff281c58db333ac7e78 (diff) | |
| download | python-decorator-git-d7d4bac90419a049165da9f29e2b8fef18fa7f33.tar.gz | |
Rebuilt the docs
Diffstat (limited to 'documentation3.pdf')
| -rw-r--r-- | documentation3.pdf | 6666 |
1 files changed, 4674 insertions, 1992 deletions
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BT 1 0 0 1 0 3.5 Tm 21 TL /F2 17.5 Tf 0 0 0 rg (The solution) Tj T* ET
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-BT 1 0 0 1 0 38 Tm 1.716412 Tw 12 TL /F4 10 Tf 0 0 0 rg (decorator ) Tj /F1 10 Tf (takes two arguments, a caller function describing the functionality of the decorator and a) Tj T* 0 Tw 2.594983 Tw (function to be decorated; it returns the decorated function. The caller function must have signature) Tj T* 0 Tw .19311 Tw /F4 10 Tf (\(f,) Tj ( ) Tj (*args,) Tj ( ) Tj (**kw\) ) Tj /F1 10 Tf (and it must call the original function ) Tj /F4 10 Tf (f ) Tj /F1 10 Tf (with arguments ) Tj /F4 10 Tf (args ) Tj /F1 10 Tf (and ) Tj /F4 10 Tf (kw) Tj /F1 10 Tf (, implementing) Tj T* 0 Tw (the wanted capability, i.e. memoization in this case:) Tj T* ET
+BT 1 0 0 1 0 38 Tm 1.716412 Tw 12 TL /F4 10 Tf 0 0 0 rg (decorator ) Tj /F1 10 Tf 0 0 0 rg (takes two arguments, a caller function describing the functionality of the decorator and a) Tj T* 0 Tw 2.594983 Tw (function to be decorated; it returns the decorated function. The caller function must have signature) Tj T* 0 Tw .19311 Tw /F4 10 Tf 0 0 0 rg (\(f,) Tj ( ) Tj (*args,) Tj ( ) Tj (**kw\) ) Tj /F1 10 Tf 0 0 0 rg (and it must call the original function ) Tj /F4 10 Tf 0 0 0 rg (f ) Tj /F1 10 Tf 0 0 0 rg (with arguments ) Tj /F4 10 Tf 0 0 0 rg (args ) Tj /F1 10 Tf 0 0 0 rg (and ) Tj /F4 10 Tf 0 0 0 rg (kw) Tj /F1 10 Tf 0 0 0 rg (, implementing) Tj T* 0 Tw (the wanted capability, i.e. memoization in this case:) Tj T* ET
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BT 1 0 0 1 0 2 Tm /F1 10 Tf 12 TL (At this point you can define your decorator as follows:) Tj T* ET
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-BT 1 0 0 1 0 26 Tm .12561 Tw 12 TL /F1 10 Tf 0 0 0 rg (The difference with respect to the ) Tj /F4 10 Tf (memoize_uw ) Tj /F1 10 Tf (approach, which is based on nested functions, is that the) Tj T* 0 Tw 2.59528 Tw (decorator module forces you to lift the inner function at the outer level \() Tj /F5 10 Tf (flat is better than nested) Tj /F1 10 Tf (\).) Tj T* 0 Tw (Moreover, you are forced to pass explicitly the function you want to decorate to the caller function.) Tj T* ET
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Q
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-BT 1 0 0 1 0 110 Tm 12 TL /F4 10 Tf .4 .4 .4 rg (>) Tj (>) Tj (>) Tj 0 0 0 rg ( ) Tj .666667 .133333 1 rg (@memoize) Tj 0 0 0 rg T* .4 .4 .4 rg (...) Tj 0 0 0 rg ( ) Tj /F3 10 Tf 0 .501961 0 rg (def) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (heavy_computation) Tj 0 0 0 rg (\(\):) Tj T* .4 .4 .4 rg (...) Tj 0 0 0 rg ( ) Tj (time) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (sleep) Tj (\() Tj .4 .4 .4 rg (2) Tj 0 0 0 rg (\)) Tj T* .4 .4 .4 rg (...) Tj 0 0 0 rg ( ) Tj /F3 10 Tf 0 .501961 0 rg (return) Tj /F4 10 Tf 0 0 0 rg ( ) Tj .729412 .129412 .129412 rg ("done") Tj 0 0 0 rg T* T* .4 .4 .4 rg (>) Tj (>) Tj (>) Tj 0 0 0 rg ( ) Tj /F3 10 Tf 0 .501961 0 rg (print) Tj /F4 10 Tf 0 0 0 rg (\() Tj (heavy_computation) Tj (\(\)\)) Tj ( ) Tj /F6 10 Tf .25098 .501961 .501961 rg (# the first time it will take 2 seconds) Tj /F4 10 Tf 0 0 0 rg T* (done) Tj T* T* .4 .4 .4 rg (>) Tj (>) Tj (>) Tj 0 0 0 rg ( ) Tj /F3 10 Tf 0 .501961 0 rg (print) Tj /F4 10 Tf 0 0 0 rg (\() Tj (heavy_computation) Tj (\(\)\)) Tj ( ) Tj /F6 10 Tf .25098 .501961 .501961 rg (# the second time it will be instantaneous) Tj /F4 10 Tf 0 0 0 rg T* (done) Tj T* ET
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+BT 1 0 0 1 0 110 Tm 12 TL /F4 10 Tf .4 .4 .4 rg (>) Tj (>) Tj (>) Tj 0 0 0 rg ( ) Tj .666667 .133333 1 rg (@memoize) Tj 0 0 0 rg T* .4 .4 .4 rg (...) Tj 0 0 0 rg ( ) Tj /F3 10 Tf 0 .501961 0 rg (def) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (heavy_computation) Tj 0 0 0 rg (\(\):) Tj 0 0 0 rg T* .4 .4 .4 rg (...) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (time) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (sleep) Tj 0 0 0 rg (\() Tj .4 .4 .4 rg (2) Tj 0 0 0 rg (\)) Tj 0 0 0 rg T* .4 .4 .4 rg (...) Tj 0 0 0 rg ( ) Tj /F3 10 Tf 0 .501961 0 rg (return) Tj /F4 10 Tf 0 0 0 rg ( ) Tj .729412 .129412 .129412 rg ("done") Tj 0 0 0 rg T* T* .4 .4 .4 rg (>) Tj (>) Tj (>) Tj 0 0 0 rg ( ) Tj /F3 10 Tf 0 .501961 0 rg (print) Tj /F4 10 Tf 0 0 0 rg (\() Tj 0 0 0 rg (heavy_computation) Tj 0 0 0 rg (\(\)\)) Tj 0 0 0 rg ( ) Tj /F6 10 Tf .25098 .501961 .501961 rg (# the first time it will take 2 seconds) Tj /F4 10 Tf 0 0 0 rg T* 0 0 0 rg (done) Tj 0 0 0 rg T* T* .4 .4 .4 rg (>) Tj (>) Tj (>) Tj 0 0 0 rg ( ) Tj /F3 10 Tf 0 .501961 0 rg (print) Tj /F4 10 Tf 0 0 0 rg (\() Tj 0 0 0 rg (heavy_computation) Tj 0 0 0 rg (\(\)\)) Tj 0 0 0 rg ( ) Tj /F6 10 Tf .25098 .501961 .501961 rg (# the second time it will be instantaneous) Tj /F4 10 Tf 0 0 0 rg T* 0 0 0 rg (done) Tj T* ET
Q
Q
Q
Q
Q
q
-1 0 0 1 62.69291 492.6236 cm
+1 0 0 1 62.69291 427.4236 cm
q
-BT 1 0 0 1 0 2 Tm 12 TL /F1 10 Tf 0 0 0 rg (The signature of ) Tj /F4 10 Tf (heavy_computation ) Tj /F1 10 Tf (is the one you would expect:) Tj T* ET
+BT 1 0 0 1 0 2 Tm 12 TL /F1 10 Tf 0 0 0 rg (The signature of ) Tj /F4 10 Tf 0 0 0 rg (heavy_computation ) Tj /F1 10 Tf 0 0 0 rg (is the one you would expect:) Tj T* ET
Q
Q
q
-1 0 0 1 62.69291 447.4236 cm
+1 0 0 1 62.69291 382.2236 cm
q
q
1 0 0 1 0 0 cm
@@ -2334,26 +1791,78 @@ q n -6 -6 468.6898 36 re B*
Q
q
-BT 1 0 0 1 0 14 Tm 12 TL /F4 10 Tf .4 .4 .4 rg (>) Tj (>) Tj (>) Tj 0 0 0 rg ( ) Tj /F3 10 Tf 0 .501961 0 rg (print) Tj /F4 10 Tf 0 0 0 rg (\() Tj (getargspec) Tj (\() Tj (heavy_computation) Tj (\)\)) Tj T* (ArgSpec) Tj (\() Tj (args) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ([],) Tj ( ) Tj (varargs) Tj .4 .4 .4 rg (=) Tj 0 .501961 0 rg (None) Tj 0 0 0 rg (,) Tj ( ) Tj (keywords) Tj .4 .4 .4 rg (=) Tj 0 .501961 0 rg (None) Tj 0 0 0 rg (,) Tj ( ) Tj (defaults) Tj .4 .4 .4 rg (=) Tj 0 .501961 0 rg (None) Tj 0 0 0 rg (\)) Tj T* ET
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+BT 1 0 0 1 0 14 Tm 12 TL /F4 10 Tf .4 .4 .4 rg (>) Tj (>) Tj (>) Tj 0 0 0 rg ( ) Tj /F3 10 Tf 0 .501961 0 rg (print) Tj /F4 10 Tf 0 0 0 rg (\() Tj 0 0 0 rg (getargspec) Tj 0 0 0 rg (\() Tj 0 0 0 rg (heavy_computation) Tj 0 0 0 rg (\)\)) Tj 0 0 0 rg T* 0 0 0 rg (ArgSpec) Tj 0 0 0 rg (\() Tj 0 0 0 rg (args) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ([],) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (varargs) Tj .4 .4 .4 rg (=) Tj 0 .501961 0 rg (None) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (keywords) Tj .4 .4 .4 rg (=) Tj 0 .501961 0 rg (None) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (defaults) Tj .4 .4 .4 rg (=) Tj 0 .501961 0 rg (None) Tj 0 0 0 rg (\)) Tj T* ET
Q
Q
Q
Q
Q
q
-1 0 0 1 62.69291 414.4236 cm
+1 0 0 1 62.69291 349.2236 cm
q
-BT 1 0 0 1 0 3.5 Tm 21 TL /F2 17.5 Tf 0 0 0 rg (A ) Tj /F3 17.5 Tf (trace ) Tj /F2 17.5 Tf (decorator) Tj T* ET
+BT 1 0 0 1 0 3.5 Tm 21 TL /F2 17.5 Tf 0 0 0 rg (A ) Tj /F3 17.5 Tf 0 0 0 rg (trace ) Tj /F2 17.5 Tf 0 0 0 rg (decorator) Tj T* ET
Q
Q
q
-1 0 0 1 62.69291 384.4236 cm
+1 0 0 1 62.69291 319.2236 cm
q
-BT 1 0 0 1 0 14 Tm .479398 Tw 12 TL /F1 10 Tf 0 0 0 rg (As an additional example, here is how you can define a trivial ) Tj /F4 10 Tf (trace ) Tj /F1 10 Tf (decorator, which prints a message) Tj T* 0 Tw (everytime the traced function is called:) Tj T* ET
+BT 1 0 0 1 0 14 Tm .479398 Tw 12 TL /F1 10 Tf 0 0 0 rg (As an additional example, here is how you can define a trivial ) Tj /F4 10 Tf 0 0 0 rg (trace ) Tj /F1 10 Tf 0 0 0 rg (decorator, which prints a message) Tj T* 0 Tw (everytime the traced function is called:) Tj T* ET
Q
Q
q
-1 0 0 1 62.69291 315.2236 cm
+1 0 0 1 62.69291 250.0236 cm
q
q
1 0 0 1 0 0 cm
@@ -2366,14 +1875,144 @@ q n -6 -6 468.6898 60 re B*
Q
q
-BT 1 0 0 1 0 38 Tm 12 TL /F3 10 Tf 0 .501961 0 rg (def) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (_trace) Tj 0 0 0 rg (\() Tj (f) Tj (,) Tj ( ) Tj .4 .4 .4 rg (*) Tj 0 0 0 rg (args) Tj (,) Tj ( ) Tj .4 .4 .4 rg (**) Tj 0 0 0 rg (kw) Tj (\):) Tj T* ( ) Tj (kwstr) Tj ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj .729412 .129412 .129412 rg (', ') Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (join) Tj (\() Tj .729412 .129412 .129412 rg (') Tj /F3 10 Tf .733333 .4 .533333 rg (%r) Tj /F4 10 Tf .729412 .129412 .129412 rg (: ) Tj /F3 10 Tf .733333 .4 .533333 rg (%r) Tj /F4 10 Tf .729412 .129412 .129412 rg (') Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (%) Tj 0 0 0 rg ( ) Tj (\() Tj (k) Tj (,) Tj ( ) Tj (kw) Tj ([) Tj (k) Tj (]\)) Tj ( ) Tj /F3 10 Tf 0 .501961 0 rg (for) Tj /F4 10 Tf 0 0 0 rg ( ) Tj (k) Tj ( ) Tj /F3 10 Tf .666667 .133333 1 rg (in) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 .501961 0 rg (sorted) Tj 0 0 0 rg (\() Tj (kw) Tj (\)\)) Tj T* ( ) Tj /F3 10 Tf 0 .501961 0 rg (print) Tj /F4 10 Tf 0 0 0 rg (\() Tj .729412 .129412 .129412 rg ("calling ) Tj /F3 10 Tf .733333 .4 .533333 rg (%s) Tj /F4 10 Tf .729412 .129412 .129412 rg ( with args ) Tj /F3 10 Tf .733333 .4 .533333 rg (%s) Tj /F4 10 Tf .729412 .129412 .129412 rg (, {) Tj /F3 10 Tf .733333 .4 .533333 rg (%s) Tj /F4 10 Tf .729412 .129412 .129412 rg (}") Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (%) Tj 0 0 0 rg ( ) Tj (\() Tj (f) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (__name__) Tj (,) Tj ( ) Tj (args) Tj (,) Tj ( ) Tj (kwstr) Tj (\)\)) Tj T* ( ) Tj /F3 10 Tf 0 .501961 0 rg (return) Tj /F4 10 Tf 0 0 0 rg ( ) Tj (f) Tj (\() Tj .4 .4 .4 rg (*) Tj 0 0 0 rg (args) Tj (,) Tj ( ) Tj .4 .4 .4 rg (**) Tj 0 0 0 rg (kw) Tj (\)) Tj T* ET
+.960784 .960784 .862745 rg
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+BT 1 0 0 1 0 38 Tm 12 TL /F3 10 Tf 0 .501961 0 rg (def) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (_trace) Tj 0 0 0 rg (\() Tj 0 0 0 rg (f) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (*) Tj 0 0 0 rg (args) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (**) Tj 0 0 0 rg (kw) Tj 0 0 0 rg (\):) Tj 0 0 0 rg T* ( ) Tj 0 0 0 rg (kwstr) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj .729412 .129412 .129412 rg (', ') Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (join) Tj 0 0 0 rg (\() Tj .729412 .129412 .129412 rg (') Tj /F3 10 Tf .733333 .4 .533333 rg (%r) Tj /F4 10 Tf .729412 .129412 .129412 rg (: ) Tj /F3 10 Tf .733333 .4 .533333 rg (%r) Tj /F4 10 Tf .729412 .129412 .129412 rg (') Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (%) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (\() Tj 0 0 0 rg (k) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (kw) Tj 0 0 0 rg ([) Tj 0 0 0 rg (k) Tj 0 0 0 rg (]\)) Tj 0 0 0 rg ( ) Tj /F3 10 Tf 0 .501961 0 rg (for) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 0 0 rg (k) Tj 0 0 0 rg ( ) Tj /F3 10 Tf .666667 .133333 1 rg (in) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 .501961 0 rg (sorted) Tj 0 0 0 rg (\() Tj 0 0 0 rg (kw) Tj 0 0 0 rg (\)\)) Tj 0 0 0 rg T* ( ) Tj /F3 10 Tf 0 .501961 0 rg (print) Tj /F4 10 Tf 0 0 0 rg (\() Tj .729412 .129412 .129412 rg ("calling ) Tj /F3 10 Tf .733333 .4 .533333 rg (%s) Tj /F4 10 Tf .729412 .129412 .129412 rg ( with args ) Tj /F3 10 Tf .733333 .4 .533333 rg (%s) Tj /F4 10 Tf .729412 .129412 .129412 rg (, {) Tj /F3 10 Tf .733333 .4 .533333 rg (%s) Tj /F4 10 Tf .729412 .129412 .129412 rg (}") Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (%) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (\() Tj 0 0 0 rg (f) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (__name__) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (args) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (kwstr) Tj 0 0 0 rg (\)\)) Tj 0 0 0 rg T* ( ) Tj /F3 10 Tf 0 .501961 0 rg (return) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 0 0 rg (f) Tj 0 0 0 rg (\() Tj .4 .4 .4 rg (*) Tj 0 0 0 rg (args) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (**) Tj 0 0 0 rg (kw) Tj 0 0 0 rg (\)) Tj T* ET
Q
Q
Q
Q
Q
q
-1 0 0 1 62.69291 270.0236 cm
+1 0 0 1 62.69291 204.8236 cm
q
q
1 0 0 1 0 0 cm
@@ -2386,21 +2025,45 @@ q n -6 -6 468.6898 36 re B*
Q
q
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-BT 1 0 0 1 0 26 Tm 12 TL /F3 10 Tf 0 .501961 0 rg (def) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (on_success) Tj 0 0 0 rg (\() Tj (result) Tj (\):) Tj ( ) Tj /F6 10 Tf .25098 .501961 .501961 rg (# default implementation) Tj /F4 10 Tf 0 0 0 rg T* ( ) Tj .729412 .129412 .129412 rg ("Called on the result of the function") Tj 0 0 0 rg T* ( ) Tj /F3 10 Tf 0 .501961 0 rg (return) Tj /F4 10 Tf 0 0 0 rg ( ) Tj (result) Tj T* ET
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+BT 1 0 0 1 0 26 Tm /F1 10 Tf 12 TL 1.647485 Tw (We have just seen an examples of a simple decorator factory, implemented as a function returning a) Tj T* 0 Tw .29784 Tw (decorator. For more complex situations, it is more convenient to implement decorator factories as classes) Tj T* 0 Tw (returning callable objects that can be converted into decorators.) Tj T* ET
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+BT 1 0 0 1 0 50 Tm 2.853876 Tw 12 TL /F1 10 Tf 0 0 0 rg (As an example, here will I show a decorator which is able to convert a blocking function into an) Tj T* 0 Tw 2.477126 Tw (asynchronous function. The function, when called, is executed in a separate thread. Moreover, it is) Tj T* 0 Tw .288443 Tw (possible to set three callbacks ) Tj /F4 10 Tf 0 0 0 rg (on_success) Tj /F1 10 Tf 0 0 0 rg (, ) Tj /F4 10 Tf 0 0 0 rg (on_failure ) Tj /F1 10 Tf 0 0 0 rg (and ) Tj /F4 10 Tf 0 0 0 rg (on_closing) Tj /F1 10 Tf 0 0 0 rg (, to specify how to manage) Tj T* 0 Tw 1.854724 Tw (the function call \(of course the code here is just an example, it is not a recommended way of doing) Tj T* 0 Tw (multi-threaded programming\). The implementation is the following:) Tj T* ET
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Q
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+BT 1 0 0 1 0 26 Tm 12 TL /F3 10 Tf 0 .501961 0 rg (def) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (on_success) Tj 0 0 0 rg (\() Tj 0 0 0 rg (result) Tj 0 0 0 rg (\):) Tj 0 0 0 rg ( ) Tj /F6 10 Tf .25098 .501961 .501961 rg (# default implementation) Tj /F4 10 Tf 0 0 0 rg T* ( ) Tj .729412 .129412 .129412 rg ("Called on the result of the function") Tj 0 0 0 rg T* ( ) Tj /F3 10 Tf 0 .501961 0 rg (return) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 0 0 rg (result) Tj T* ET
Q
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Q
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-BT 1 0 0 1 0 26 Tm 12 TL /F3 10 Tf 0 .501961 0 rg (def) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (on_closing) Tj 0 0 0 rg (\(\):) Tj ( ) Tj /F6 10 Tf .25098 .501961 .501961 rg (# default implementation) Tj /F4 10 Tf 0 0 0 rg T* ( ) Tj .729412 .129412 .129412 rg ("Called at the end, both in case of success and failure") Tj 0 0 0 rg T* ( ) Tj /F3 10 Tf 0 .501961 0 rg (pass) Tj T* ET
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+BT 1 0 0 1 0 26 Tm 12 TL /F3 10 Tf 0 .501961 0 rg (def) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (on_failure) Tj 0 0 0 rg (\() Tj 0 0 0 rg (exc_info) Tj 0 0 0 rg (\):) Tj 0 0 0 rg ( ) Tj /F6 10 Tf .25098 .501961 .501961 rg (# default implementation) Tj /F4 10 Tf 0 0 0 rg T* ( ) Tj .729412 .129412 .129412 rg ("Called if the function fails") Tj 0 0 0 rg T* ( ) Tj /F3 10 Tf 0 .501961 0 rg (pass) Tj T* ET
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-n -6 -6 468.6898 84 re B*
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Q
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-BT 1 0 0 1 0 62 Tm 12 TL /F3 10 Tf 0 .501961 0 rg (class) Tj /F4 10 Tf 0 0 0 rg ( ) Tj /F3 10 Tf 0 0 1 rg (Async) Tj /F4 10 Tf 0 0 0 rg (\() Tj 0 .501961 0 rg (object) Tj 0 0 0 rg (\):) Tj T* ( ) Tj /F6 10 Tf .729412 .129412 .129412 rg (""") Tj T* ( A decorator converting blocking functions into asynchronous) Tj T* ( functions, by using threads or processes. Examples:) Tj T* T* ( async_with_threads = Async\(threading.Thread\)) Tj T* ET
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+BT 1 0 0 1 0 26 Tm 12 TL /F3 10 Tf 0 .501961 0 rg (def) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (on_closing) Tj 0 0 0 rg (\(\):) Tj 0 0 0 rg ( ) Tj /F6 10 Tf .25098 .501961 .501961 rg (# default implementation) Tj /F4 10 Tf 0 0 0 rg T* ( ) Tj .729412 .129412 .129412 rg ("Called at the end, both in case of success and failure") Tj 0 0 0 rg T* ( ) Tj /F3 10 Tf 0 .501961 0 rg (pass) Tj T* ET
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Examples:) Tj T* T* ( async_with_threads = Async\(threading.Thread\)) Tj T* ( async_with_processes = Async\(multiprocessing.Process\)) Tj T* ( """) Tj /F4 10 Tf 0 0 0 rg T* T* ( ) Tj /F3 10 Tf 0 .501961 0 rg (def) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (__init__) Tj 0 0 0 rg (\() Tj 0 .501961 0 rg (self) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (threadfactory) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (on_success) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg (on_success) Tj 0 0 0 rg (,) Tj 0 0 0 rg T* ( ) Tj 0 0 0 rg (on_failure) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg (on_failure) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (on_closing) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg (on_closing) Tj 0 0 0 rg (\):) Tj 0 0 0 rg T* ( ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (threadfactory) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (threadfactory) Tj 0 0 0 rg T* ( ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (on_success) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (on_success) Tj 0 0 0 rg T* ( ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (on_failure) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (on_failure) Tj 0 0 0 rg T* ( ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (on_closing) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (on_closing) Tj 0 0 0 rg T* T* ( ) Tj /F3 10 Tf 0 .501961 0 rg (def) Tj /F4 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (__call__) Tj 0 0 0 rg (\() Tj 0 .501961 0 rg (self) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (func) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (*) Tj 0 0 0 rg (args) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (**) Tj 0 0 0 rg (kw) Tj 0 0 0 rg (\):) Tj 0 0 0 rg T* ( ) Tj /F3 10 Tf 0 .501961 0 rg (try) Tj /F4 10 Tf 0 0 0 rg (:) Tj 0 0 0 rg T* ( ) Tj 0 0 0 rg (counter) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (func) Tj .4 .4 .4 rg (.) 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BT 1 0 0 1 0 3.5 Tm 21 TL /F2 17.5 Tf 0 0 0 rg (contextmanager) Tj T* ET
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-BT 1 0 0 1 0 14 Tm 2.685984 Tw 12 TL /F1 10 Tf 0 0 0 rg (For a long time Python had in its standard library a ) Tj /F4 10 Tf (contextmanager ) Tj /F1 10 Tf (decorator, able to convert) Tj T* 0 Tw (generator functions into ) Tj /F4 10 Tf (_GeneratorContextManager ) Tj /F1 10 Tf (factories. For instance if you write) Tj T* ET
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1 0 0 1 0 0 cm
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-1 0 0 1 62.69291 467.6236 cm
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-BT 1 0 0 1 0 14 Tm .955976 Tw 12 TL /F1 10 Tf 0 0 0 rg (then ) Tj /F4 10 Tf (before_after ) Tj /F1 10 Tf (is a factory function returning ) Tj /F4 10 Tf (_GeneratorContextManager ) Tj /F1 10 Tf (objects which can) Tj T* 0 Tw (be used with the ) Tj /F4 10 Tf (with ) Tj /F1 10 Tf (statement:) Tj T* ET
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Q
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-1 0 0 1 62.69291 306.4236 cm
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-BT 1 0 0 1 0 26 Tm .462488 Tw 12 TL /F1 10 Tf 0 0 0 rg (Basically, it is as if the content of the ) Tj /F4 10 Tf (with ) Tj /F1 10 Tf (block was executed in the place of the ) Tj /F4 10 Tf (yield ) Tj /F1 10 Tf (expression in) Tj T* 0 Tw 2.146342 Tw (the generator function. In Python 3.2 ) Tj /F4 10 Tf (_GeneratorContextManager ) Tj /F1 10 Tf (objects were enhanced with a) Tj T* 0 Tw /F4 10 Tf (__call__ ) Tj /F1 10 Tf (method, so that they can be used as decorators as in this example:) Tj T* ET
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-1 0 0 1 62.69291 189.2236 cm
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-1 0 0 1 62.69291 85.22362 cm
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Q
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-BT 1 0 0 1 0 62 Tm 4.63311 Tw 12 TL /F1 10 Tf 0 0 0 rg (Notice that while I do not have plans to change or remove the functionality provided in the) Tj T* 0 Tw 1.00936 Tw /F4 10 Tf (FunctionMaker ) Tj /F1 10 Tf (class, I do not guarantee that it will stay unchanged forever. For instance, right now I) Tj T* 0 Tw .791318 Tw (am using the traditional string interpolation syntax for function templates, but Python 2.6 and Python 3.0) Tj T* 0 Tw .712093 Tw (provide a newer interpolation syntax and I may use the new syntax in the future. On the other hand, the) Tj T* 0 Tw .639985 Tw (functionality provided by ) Tj /F4 10 Tf (decorator ) Tj /F1 10 Tf (has been there from version 0.1 and it is guaranteed to stay there) Tj T* 0 Tw (forever.) Tj T* ET
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-BT 1 0 0 1 0 38 Tm 1.471235 Tw 12 TL /F1 10 Tf 0 0 0 rg (\(see bug report ) Tj 0 0 .501961 rg (1764286 ) Tj 0 0 0 rg (for an explanation of what is happening\). Unfortunately the bug is still there,) Tj T* 0 Tw 1.541235 Tw (even in Python 2.7 and 3.1. There is however a workaround. The decorator module adds an attribute) Tj T* 0 Tw .103984 Tw /F4 10 Tf (.__wrapped__ ) Tj /F1 10 Tf (to the decorated function, containing a reference to the original function. The easy way to) Tj T* 0 Tw (get the source code is to call ) Tj /F4 10 Tf (inspect.getsource ) Tj /F1 10 Tf (on the undecorated function:) Tj T* ET
+BT 1 0 0 1 0 38 Tm 1.471235 Tw 12 TL /F1 10 Tf 0 0 0 rg (\(see bug report ) Tj 0 0 .501961 rg (1764286 ) Tj 0 0 0 rg (for an explanation of what is happening\). Unfortunately the bug is still there,) Tj T* 0 Tw 1.541235 Tw (even in Python 2.7 and 3.1. There is however a workaround. The decorator module adds an attribute) Tj T* 0 Tw .103984 Tw /F4 10 Tf 0 0 0 rg (.__wrapped__ ) Tj /F1 10 Tf 0 0 0 rg (to the decorated function, containing a reference to the original function. The easy way to) Tj T* 0 Tw (get the source code is to call ) Tj /F4 10 Tf 0 0 0 rg (inspect.getsource ) Tj /F1 10 Tf 0 0 0 rg (on the undecorated function:) Tj T* ET
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-n -6 -6 468.6898 96 re B*
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-BT 1 0 0 1 0 26 Tm .13104 Tw 12 TL /F1 10 Tf 0 0 0 rg (Notice that I am not providing this functionality in the ) Tj /F4 10 Tf (decorator ) Tj /F1 10 Tf (module directly since I think it is best to) Tj T* 0 Tw 2.070751 Tw (rewrite the decorator rather than adding an additional level of indirection. However, practicality beats) Tj T* 0 Tw (purity, so you can add ) Tj /F4 10 Tf (decorator_apply ) Tj /F1 10 Tf (to your toolbox and use it if you need to.) Tj T* ET
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+BT 1 0 0 1 0 26 Tm .13104 Tw 12 TL /F1 10 Tf 0 0 0 rg (Notice that I am not providing this functionality in the ) Tj /F4 10 Tf 0 0 0 rg (decorator ) Tj /F1 10 Tf 0 0 0 rg (module directly since I think it is best to) Tj T* 0 Tw 2.070751 Tw (rewrite the decorator rather than adding an additional level of indirection. However, practicality beats) Tj T* 0 Tw (purity, so you can add ) Tj /F4 10 Tf 0 0 0 rg (decorator_apply ) Tj /F1 10 Tf 0 0 0 rg (to your toolbox and use it if you need to.) Tj T* ET
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-1 0 0 1 62.69291 285.8236 cm
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BT 1 0 0 1 0 2 Tm /F1 10 Tf 12 TL (Here the decorator is implemented as a class returning callable objects.) Tj T* ET
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-1 0 0 1 62.69291 240.6236 cm
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Q
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-1 0 0 1 62.69291 220.6236 cm
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BT 1 0 0 1 0 2 Tm /F1 10 Tf 12 TL (Here is how you apply the upgraded decorator to the good old factorial:) Tj T* ET
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-1 0 0 1 62.69291 575.8236 cm
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-BT 1 0 0 1 0 50 Tm 1.05528 Tw 12 TL /F1 10 Tf 0 0 0 rg (You see here the inner call to the decorator ) Tj /F4 10 Tf (trace) Tj /F1 10 Tf (, which calls ) Tj /F4 10 Tf (f\(*args,) Tj ( ) Tj (**kw\)) Tj /F1 10 Tf (, and a reference to) Tj T* 0 Tw .076457 Tw /F4 10 Tf (File) Tj ( ) Tj (") Tj (<) Tj (string) Tj (>) Tj (",) Tj ( ) Tj (line) Tj ( ) Tj (2,) Tj ( ) Tj (in) Tj ( ) Tj (f) Tj /F1 10 Tf (. This latter reference is due to the fact that internally the decorator) Tj T* 0 Tw 2.053318 Tw (module uses ) Tj /F4 10 Tf (exec ) Tj /F1 10 Tf (to generate the decorated function. Notice that ) Tj /F4 10 Tf (exec ) Tj /F1 10 Tf (is ) Tj /F5 10 Tf (not ) Tj /F1 10 Tf (responsibile for the) Tj T* 0 Tw 1.507485 Tw (performance penalty, since is the called ) Tj /F5 10 Tf (only once ) Tj /F1 10 Tf (at function decoration time, and not every time the) Tj T* 0 Tw (decorated function is called.) Tj T* ET
+BT 1 0 0 1 0 50 Tm 1.05528 Tw 12 TL /F1 10 Tf 0 0 0 rg (You see here the inner call to the decorator ) Tj /F4 10 Tf 0 0 0 rg (trace) Tj /F1 10 Tf 0 0 0 rg (, which calls ) Tj /F4 10 Tf 0 0 0 rg (f\(*args,) Tj ( ) Tj (**kw\)) Tj /F1 10 Tf 0 0 0 rg (, and a reference to) Tj T* 0 Tw .076457 Tw /F4 10 Tf 0 0 0 rg (File) Tj ( ) Tj (") Tj (<) Tj (string) Tj (>) Tj (",) Tj ( ) Tj (line) Tj ( ) Tj (2,) Tj ( ) Tj (in) Tj ( ) Tj (f) Tj /F1 10 Tf 0 0 0 rg (. This latter reference is due to the fact that internally the decorator) Tj T* 0 Tw 2.053318 Tw (module uses ) Tj /F4 10 Tf 0 0 0 rg (exec ) Tj /F1 10 Tf 0 0 0 rg (to generate the decorated function. Notice that ) Tj /F4 10 Tf 0 0 0 rg (exec ) Tj /F1 10 Tf 0 0 0 rg (is ) Tj /F5 10 Tf (not ) Tj /F1 10 Tf (responsibile for the) Tj T* 0 Tw 1.507485 Tw (performance penalty, since is the called ) Tj /F5 10 Tf (only once ) Tj /F1 10 Tf (at function decoration time, and not every time the) Tj T* 0 Tw (decorated function is called.) Tj T* ET
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-1 0 0 1 62.69291 497.8236 cm
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-BT 1 0 0 1 0 62 Tm .932209 Tw 12 TL /F1 10 Tf 0 0 0 rg (At present, there is no clean way to avoid ) Tj /F4 10 Tf (exec) Tj /F1 10 Tf (. A clean solution would require to change the CPython) Tj T* 0 Tw .777485 Tw (implementation of functions and add an hook to make it possible to change their signature directly. That) Tj T* 0 Tw .74186 Tw (could happen in future versions of Python \(see PEP ) Tj 0 0 .501961 rg (362) Tj 0 0 0 rg (\) and then the decorator module would become) Tj T* 0 Tw 2.385318 Tw (obsolete. However, at present, even in Python 3.2 it is impossible to change the function signature) Tj T* 0 Tw .931751 Tw (directly, therefore the ) Tj /F4 10 Tf (decorator ) Tj /F1 10 Tf (module is still useful. Actually, this is one of the main reasons why I) Tj T* 0 Tw (keep maintaining the module and releasing new versions.) Tj T* ET
+BT 1 0 0 1 0 62 Tm .932209 Tw 12 TL /F1 10 Tf 0 0 0 rg (At present, there is no clean way to avoid ) Tj /F4 10 Tf 0 0 0 rg (exec) Tj /F1 10 Tf 0 0 0 rg (. A clean solution would require to change the CPython) Tj T* 0 Tw .777485 Tw (implementation of functions and add an hook to make it possible to change their signature directly. That) Tj T* 0 Tw .74186 Tw (could happen in future versions of Python \(see PEP ) Tj 0 0 .501961 rg (362) Tj 0 0 0 rg (\) and then the decorator module would become) Tj T* 0 Tw 2.385318 Tw (obsolete. However, at present, even in Python 3.2 it is impossible to change the function signature) Tj T* 0 Tw .931751 Tw (directly, therefore the ) Tj /F4 10 Tf 0 0 0 rg (decorator ) Tj /F1 10 Tf 0 0 0 rg (module is still useful. Actually, this is one of the main reasons why I) Tj T* 0 Tw (keep maintaining the module and releasing new versions.) Tj T* ET
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-1 0 0 1 62.69291 455.8236 cm
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-BT 1 0 0 1 0 26 Tm 1.043828 Tw 12 TL /F1 10 Tf 0 0 0 rg (In the present implementation, decorators generated by ) Tj /F4 10 Tf (decorator ) Tj /F1 10 Tf (can only be used on user-defined) Tj T* 0 Tw .152485 Tw (Python functions or methods, not on generic callable objects, nor on built-in functions, due to limitations of) Tj T* 0 Tw (the ) Tj /F4 10 Tf (inspect ) Tj /F1 10 Tf (module in the standard library.) Tj T* ET
+BT 1 0 0 1 0 26 Tm 1.043828 Tw 12 TL /F1 10 Tf 0 0 0 rg (In the present implementation, decorators generated by ) Tj /F4 10 Tf 0 0 0 rg (decorator ) Tj /F1 10 Tf 0 0 0 rg (can only be used on user-defined) Tj T* 0 Tw .152485 Tw (Python functions or methods, not on generic callable objects, nor on built-in functions, due to limitations of) Tj T* 0 Tw (the ) Tj /F4 10 Tf 0 0 0 rg (inspect ) Tj /F1 10 Tf 0 0 0 rg (module in the standard library.) Tj T* ET
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-1 0 0 1 62.69291 425.8236 cm
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-BT 1 0 0 1 0 14 Tm .785777 Tw 12 TL /F1 10 Tf 0 0 0 rg (There is a restriction on the names of the arguments: for instance, if try to call an argument ) Tj /F4 10 Tf (_call_ ) Tj /F1 10 Tf (or) Tj T* 0 Tw /F4 10 Tf (_func_ ) Tj /F1 10 Tf (you will get a ) Tj /F4 10 Tf (NameError) Tj /F1 10 Tf (:) Tj T* ET
+BT 1 0 0 1 0 14 Tm .785777 Tw 12 TL /F1 10 Tf 0 0 0 rg (There is a restriction on the names of the arguments: for instance, if try to call an argument ) Tj /F4 10 Tf 0 0 0 rg (_call_ ) Tj /F1 10 Tf 0 0 0 rg (or) Tj T* 0 Tw /F4 10 Tf 0 0 0 rg (_func_ ) Tj /F1 10 Tf 0 0 0 rg (you will get a ) Tj /F4 10 Tf 0 0 0 rg (NameError) Tj /F1 10 Tf 0 0 0 rg (:) Tj T* ET
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-1 0 0 1 62.69291 308.6236 cm
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-BT 1 0 0 1 0 14 Tm 1.533318 Tw 12 TL /F1 10 Tf 0 0 0 rg (Finally, the implementation is such that the decorated function contains a ) Tj /F5 10 Tf (copy ) Tj /F1 10 Tf (of the original function) Tj T* 0 Tw (dictionary \() Tj /F4 10 Tf (vars\(decorated_f\)) Tj ( ) Tj (is) Tj ( ) Tj (not) Tj ( ) Tj (vars\(f\)) Tj /F1 10 Tf (\):) Tj T* ET
+BT 1 0 0 1 0 14 Tm 1.533318 Tw 12 TL /F1 10 Tf 0 0 0 rg (Finally, the implementation is such that the decorated function contains a ) Tj /F5 10 Tf (copy ) Tj /F1 10 Tf (of the original function) Tj T* 0 Tw (dictionary \() Tj /F4 10 Tf 0 0 0 rg (vars\(decorated_f\)) Tj ( ) Tj (is) Tj ( ) Tj (not) Tj ( ) Tj (vars\(f\)) Tj /F1 10 Tf 0 0 0 rg (\):) Tj T* ET
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