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author | Claudiu Popa <pcmanticore@gmail.com> | 2019-02-13 11:11:57 +0100 |
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committer | Claudiu Popa <pcmanticore@gmail.com> | 2019-02-13 11:11:57 +0100 |
commit | c20bcf0b83c422c0943437864d41c3c33e8f4269 (patch) | |
tree | 0daee782b72329987a26e2819f12acb43c916c84 /doc | |
parent | 69325b4d1f2f43c66bdb0fc3591f52236cf2ce49 (diff) | |
download | pylint-git-c20bcf0b83c422c0943437864d41c3c33e8f4269.tar.gz |
Document how the pragma controls work. Close #2732
Diffstat (limited to 'doc')
-rw-r--r-- | doc/user_guide/message-control.rst | 139 | ||||
-rw-r--r-- | doc/whatsnew/2.3.rst | 3 |
2 files changed, 112 insertions, 30 deletions
diff --git a/doc/user_guide/message-control.rst b/doc/user_guide/message-control.rst index 203229d1f..8321b6642 100644 --- a/doc/user_guide/message-control.rst +++ b/doc/user_guide/message-control.rst @@ -1,8 +1,94 @@ - Messages control ----------------- +================ + +``pylint`` has an advanced message control for its checks, offering the ability +to enable / disable a message either from the command line or from the configuration +file, as well as from the code itself. + +For all of these controls, ``pylint`` accepts the following values: + +* a symbolic message: ``no-member``, ``undefined-variable`` etc. + +* a numerical ID: ``E1101``, ``E1102`` etc. + +* The name of the group of checks. You can grab those with ``pylint --list-groups``. + For example, you can disable / enable all the checks related to type checking, with + ``typecheck`` or all the checks related to variables with ``variables`` + +* Corresponding category of the checks + + * (C) convention related checks + * (R) refactoring related checks + * (W) various warnings + * (E) errors, for probable bugs in the code + * (F) fatal, if an error occurred which prevented ``pylint`` from doing further processing. + +* All the checks with ``all`` + -An example available from the examples directory: +Block disables +-------------- + +This describes how the pragma controls operate at a code level. + +The pragma controls can disable / enable: + +* All the violations on a single line + +.. sourcecode:: python + + a, b = ... # pylint: disable=unbalanced-tuple-unpacking + +* All the violations in a single scope + +.. sourcecode:: python + + def test(): + # Disable all the no-member violations in this function + # pylint: disable=no-member + ... + +* All the violations in a `block`. For instance, each separate branch of an + ``if`` statement is considered a separate block, as in the following example: + +.. sourcecode:: python + + def meth5(self): + # pylint: disable=no-member + # no error + print(self.bla) + if self.blop: + # pylint: enable=no-member + # disable all no-members for this block + print(self.blip) + else: + # This is affected by the scope disable + print(self.blip) + # pylint: enable=no-member + print(self.blip) + if self.blop: + # pylint: enable=no-member + # disable all no-members for this block + print(self.blip) + else: + # This emits a violation + print(self.blip) + + +* If the violation occurs on a block starting line, then it applies only to that line + +.. sourcecode:: python + + if self.blop: # pylint: disable=no-member; applies only to this line + # Here we get an error + print(self.blip) + else: + # error + print(self.blip) + + + +Here's an example with all these rules in a single place: .. sourcecode:: python @@ -18,80 +104,77 @@ An example available from the examples directory: def meth1(self, arg): """this issues a message""" - print self + print(self) def meth2(self, arg): """and this one not""" # pylint: disable=unused-argument - print self\ - + "foo" + print(self\ + + "foo") def meth3(self): """test one line disabling""" # no error - print self.bla # pylint: disable=no-member + print(self.bla) # pylint: disable=no-member # error - print self.blop + print(self.blop) def meth4(self): """test re-enabling""" # pylint: disable=no-member # no error - print self.bla - print self.blop + print(self.bla) + print(self.blop) # pylint: enable=no-member # error - print self.blip + print(self.blip) def meth5(self): """test IF sub-block re-enabling""" # pylint: disable=no-member # no error - print self.bla + print(self.bla) if self.blop: # pylint: enable=no-member # error - print self.blip + print(self.blip) else: # no error - print self.blip + print(self.blip) # no error - print self.blip + print(self.blip) def meth6(self): """test TRY/EXCEPT sub-block re-enabling""" # pylint: disable=no-member # no error - print self.bla + print(self.bla) try: # pylint: enable=no-member # error - print self.blip + print(self.blip) except UndefinedName: # pylint: disable=undefined-variable # no error - print self.blip + print(self.blip) # no error - print self.blip + print(self.blip) def meth7(self): """test one line block opening disabling""" if self.blop: # pylint: disable=no-member # error - print self.blip + print(self.blip) else: # error - print self.blip + print(self.blip) # error - print self.blip - + print(self.blip) def meth8(self): """test late disabling""" # error - print self.blip + print(self.blip) # pylint: disable=no-member # no error - print self.bla - print self.blop - - + print(self.bla) + print(self.blop) diff --git a/doc/whatsnew/2.3.rst b/doc/whatsnew/2.3.rst index 1f3cbc9ff..53fd8408d 100644 --- a/doc/whatsnew/2.3.rst +++ b/doc/whatsnew/2.3.rst @@ -9,8 +9,7 @@ Summary -- Release highlights ============================= -* This release improves the performance of the 2.X series after it was affected by a -performance regression a couple of releases ago. +* This release improves the performance of the 2.X series after it was affected by a performance regression a couple of releases ago. New checkers ============ |