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authorMichele Simionato <michele.simionato@gmail.com>2015-07-21 16:43:59 +0200
committerMichele Simionato <michele.simionato@gmail.com>2015-07-21 16:43:59 +0200
commit10e035eaf93997a63a30687f6fe33b918714ba61 (patch)
tree7bc04aceba74e15306e54b542414cdda99291de1 /documentation.pdf
parent5e4bc16af3f5d0e6eca3ac95ddb89ef4331c8fb8 (diff)
downloadpython-decorator-git-10e035eaf93997a63a30687f6fe33b918714ba61.tar.gz
First version of dispatch_on
Diffstat (limited to 'documentation.pdf')
-rw-r--r--documentation.pdf661
1 files changed, 485 insertions, 176 deletions
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BT 1 0 0 1 0 14 Tm .26311 Tw 12 TL /F1 10 Tf 0 0 0 rg (Here the original function takes a single argument named ) Tj /F3 10 Tf 0 0 0 rg (x) Tj /F1 10 Tf 0 0 0 rg (, but the decorated function takes any number) Tj T* 0 Tw (of arguments and keyword arguments:) Tj T* ET
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-BT 1 0 0 1 0 26 Tm .411235 Tw 12 TL /F1 10 Tf 0 0 0 rg (This means that introspection tools such as ) Tj /F4 10 Tf (pydoc ) Tj /F1 10 Tf (will give wrong informations about the signature of ) Tj /F3 10 Tf 0 0 0 rg (f1) Tj /F1 10 Tf 0 0 0 rg (.) Tj T* 0 Tw .161654 Tw (This is pretty bad: ) Tj /F4 10 Tf (pydoc ) Tj /F1 10 Tf (will tell you that the function accepts a generic signature ) Tj /F3 10 Tf 0 0 0 rg (*args) Tj /F1 10 Tf 0 0 0 rg (, ) Tj /F3 10 Tf 0 0 0 rg (**kw) Tj /F1 10 Tf 0 0 0 rg (, but when) Tj T* 0 Tw (you try to call the function with more than an argument, you will get an error:) Tj T* ET
+BT 1 0 0 1 0 38 Tm .411235 Tw 12 TL /F1 10 Tf 0 0 0 rg (This means that introspection tools such as ) Tj /F4 10 Tf (pydoc ) Tj /F1 10 Tf (will give wrong informations about the signature of ) Tj /F3 10 Tf 0 0 0 rg (f1) Tj /F1 10 Tf 0 0 0 rg (,) Tj T* 0 Tw .010488 Tw (unless you are using a recent of Python 3.X. This is pretty bad: ) Tj /F4 10 Tf (pydoc ) Tj /F1 10 Tf (will tell you that the function accepts) Tj T* 0 Tw .624431 Tw (a generic signature ) Tj /F3 10 Tf 0 0 0 rg (*args) Tj /F1 10 Tf 0 0 0 rg (, ) Tj /F3 10 Tf 0 0 0 rg (**kw) Tj /F1 10 Tf 0 0 0 rg (, but when you try to call the function with more than an argument, you) Tj T* 0 Tw (will get an error:) Tj T* ET
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+BT 1 0 0 1 0 14 Tm 1.545814 Tw 12 TL /F1 10 Tf 0 0 0 rg (Notice even in Python 3.5 ) Tj /F4 10 Tf 0 0 0 rg (inspect.getargspec ) Tj /F1 10 Tf 0 0 0 rg (and ) Tj /F4 10 Tf 0 0 0 rg (inspect.getfullargspec ) Tj /F1 10 Tf 0 0 0 rg (\(which are deprecated in that) Tj T* 0 Tw (release\) will give the wrong signature. ) Tj /F4 10 Tf 0 0 0 rg (inspect.signature ) Tj /F1 10 Tf 0 0 0 rg (will return the right signature on the surface.) Tj T* ET
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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 26 Tm 3.313984 Tw 12 TL /F1 10 Tf 0 0 0 rg (The solution is to provide a generic factory of generators, which hides the complexity of making) Tj T* 0 Tw 3.962976 Tw (signature-preserving decorators from the application programmer. The ) Tj /F3 10 Tf 0 0 0 rg (decorate ) Tj /F1 10 Tf 0 0 0 rg (function in the) Tj T* 0 Tw /F3 10 Tf 0 0 0 rg (decorator ) Tj /F1 10 Tf 0 0 0 rg (module is such a factory:) Tj T* ET
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BT 1 0 0 1 0 38 Tm 2.144983 Tw 12 TL /F3 10 Tf 0 0 0 rg (decorate ) 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 /F3 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 /F3 10 Tf 0 0 0 rg (f ) Tj /F1 10 Tf 0 0 0 rg (with arguments ) Tj /F3 10 Tf 0 0 0 rg (args ) Tj /F1 10 Tf 0 0 0 rg (and ) Tj /F3 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
Q
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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 /F3 10 Tf 0 0 0 rg (memoize_uw ) Tj /F1 10 Tf 0 0 0 rg (approach, which is based on nested functions, is that the) Tj T* 0 Tw .598876 Tw (decorator module forces you to lift the inner function at the outer level. Moreover, you are forced to pass) Tj T* 0 Tw (explicitly the function you want to decorate, there are no closures.) Tj T* ET
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0 0 0 rg
BT 1 0 0 1 0 2 Tm /F1 10 Tf 12 TL (Here is a test of usage:) Tj T* ET
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BT 1 0 0 1 0 2 Tm 12 TL /F1 10 Tf 0 0 0 rg (The signature of ) Tj /F3 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
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+BT 1 0 0 1 0 14 Tm 12 TL /F5 10 Tf 0 .501961 0 rg (def) Tj /F3 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (wrapper) 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 /F5 10 Tf 0 .501961 0 rg (return) Tj /F3 10 Tf 0 0 0 rg ( ) Tj 0 0 0 rg (func) 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
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