Regex to catch code that uses private members in python, unless its a function def

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Chapters
00:00 Question
01:34 Accepted answer (Score 2)
01:49 Answer 2 (Score 1)
02:52 Thank you

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Full question
https://stackoverflow.com/questions/3625...

Accepted answer links:
[Example]: http://pythex.org/?rege
[source]: http://www.regular-expressions.info/look...

Answer 2 links:
[ast.NodeVisitor]: https://docs.python.org/2/library/ast.ht...
[here]: https://stackoverflow.com/questions/3019...
[greentreesnakes]: https://greentreesnakes.readthedocs.org/...

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Tags
#python #regex #python27

#avk47

ACCEPTED ANSWER

Score 2

You could try :

(?<!def\s)(\b__[a-zA-Z])

Example

source

ANSWER 2

Score 1

Using ast.NodeVisitor it is very easy to get the attributes and a lot more reliable than a regex:

import inspect
import importlib
import ast

class FindAttr(ast.NodeVisitor):
    def visit_Attribute(self, node):
        print(node.attr)


mod = "test"
mod = importlib.import_module(mod)
p = ast.parse(inspect.getsource(mod))

f = FindAttr()
f.visit(p)

test.py:

class Foo(object):
    def __init__(self):
        self.__foo = "foo"

    def meth1(self):
        self.bar = "bar"

    def meth2(self):
        self.__foobar = "foobar"


    def meth3(self):
        self.blah = "foobar"
        return self.blah

Output:

In [7]: mod = "test"

In [8]: mod = importlib.import_module(mod)

In [9]: p = ast.parse(inspect.getsource(mod))

In [10]: f = FindAttr()

In [11]: f.visit(p)
__foo
bar
__foobar
blah

All you need to so is check if node.attr.startswith("__") etc.. You can visit any nodes you like, FunctionDef, ClassDef like shown here, there is a comprehensive list of all the nodes in the greentreesnakes docs and their attributes.