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�D] Z e GHq� Wn d S( sC List python source files.
There are three functions to check whether a file is a Python source, listed
here with increasing complexity:
- has_python_ext() checks whether a file name ends in '.py[w]'.
- look_like_python() checks whether the file is not binary and either has
the '.py[w]' extension or the first line contains the word 'python'.
- can_be_compiled() checks whether the file can be compiled by compile().
The file also must be of appropriate size - not bigger than a megabyte.
walk_python_files() recursively lists all Python files under the given directories.
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c s" | d k r g } n x| D]� } t d | � t j j | � rY | | � r| Vqq t j j | � rt d � x� t j | � D]� \ } } } x* | D]" } | | k r� | j | � q� q� WxE | D]= } t j j | | � } t d | � | | � r� | Vq� q� Wq� Wq t d � q Wd S( s^ Recursively yield all Python source files below the given paths.
paths: a list of files and/or directories to be checked.
is_python: a function that takes a file name and checks whether it is a
Python source file
exclude_dirs: a list of directory base names that should be excluded in
the search
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