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    <p>I'm the author of the "<em>mygod, he has written a python interpreter using regex...</em>" (i.e. pyminifier) mentioned <a href="https://stackoverflow.com/questions/1769332/script-to-remove-python-comments-docstrings#comment1653880_1769362">at that link below</a> =).<br> I just wanted to chime in and say that I've improved the code quite a bit using the tokenizer module (which I discovered thanks to this question =) ). </p> <p>You'll be happy to note that the code no longer relies so much on regular expressions and uses tokenizer to great effect. Anyway, here's the <code>remove_comments_and_docstrings()</code> function from pyminifier<br> (Note: It works properly with the edge cases that previously-posted code breaks on):</p> <pre><code>import cStringIO, tokenize def remove_comments_and_docstrings(source): """ Returns 'source' minus comments and docstrings. """ io_obj = cStringIO.StringIO(source) out = "" prev_toktype = tokenize.INDENT last_lineno = -1 last_col = 0 for tok in tokenize.generate_tokens(io_obj.readline): token_type = tok[0] token_string = tok[1] start_line, start_col = tok[2] end_line, end_col = tok[3] ltext = tok[4] # The following two conditionals preserve indentation. # This is necessary because we're not using tokenize.untokenize() # (because it spits out code with copious amounts of oddly-placed # whitespace). if start_line &gt; last_lineno: last_col = 0 if start_col &gt; last_col: out += (" " * (start_col - last_col)) # Remove comments: if token_type == tokenize.COMMENT: pass # This series of conditionals removes docstrings: elif token_type == tokenize.STRING: if prev_toktype != tokenize.INDENT: # This is likely a docstring; double-check we're not inside an operator: if prev_toktype != tokenize.NEWLINE: # Note regarding NEWLINE vs NL: The tokenize module # differentiates between newlines that start a new statement # and newlines inside of operators such as parens, brackes, # and curly braces. Newlines inside of operators are # NEWLINE and newlines that start new code are NL. # Catch whole-module docstrings: if start_col &gt; 0: # Unlabelled indentation means we're inside an operator out += token_string # Note regarding the INDENT token: The tokenize module does # not label indentation inside of an operator (parens, # brackets, and curly braces) as actual indentation. # For example: # def foo(): # "The spaces before this docstring are tokenize.INDENT" # test = [ # "The spaces before this string do not get a token" # ] else: out += token_string prev_toktype = token_type last_col = end_col last_lineno = end_line return out </code></pre>
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    1. POScript to remove Python comments/docstrings
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    1. USCommunity
    1. USDan McDougall
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    1. CO+1 for updating your code :)
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      1. USAnurag Uniyal
 

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