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    <p>You can tokenize Python source code using the <a href="http://docs.python.org/2/library/tokenize.html" rel="nofollow">tokenize</a> module from the standard library. This will allow you to find all variable names used in the script.</p> <p>Now suppose we define a "non-dependency" as any variable name that comes immediately before an <code>=</code> sign. Then, depending on how simple your script code really is (see the Caveats below), you may be able to determine the variable names which are not non-dependencies this way:</p> <pre><code>import tokenize import io import token import collections import keyword kwset = set(keyword.kwlist) class Token(collections.namedtuple('Token', 'num val start end line')): @property def name(self): return token.tok_name[self.num] source = ''' C = A+B D = C * 4 ''' lastname = None names = set() not_dep = set() for tok in tokenize.generate_tokens(io.BytesIO(source).readline): tok = Token(*tok) print(tok.name, tok.val) if tok.name == 'NAME': names.add(tok.val) lastname = tok.val if tok.name == 'OP' and tok.val == '=': not_dep.add(lastname) print(names) # set(['A', 'C', 'B', 'D']) print(not_dep) # set(['C', 'D']) deps = dict.fromkeys(names - not_dep - kwset, 1) print(deps) # {'A': 1, 'B': 1} </code></pre> <hr> <p><strong>Caveats</strong>:</p> <ul> <li><p>If your scripts contain statements other than simple assignments, then <code>names</code> may become populated with undesired variable names. For example,</p> <pre><code>import numpy </code></pre> <p>would add both <code>'import'</code> and <code>'numpy'</code> to the set <code>names</code>.</p></li> <li><p>If your script contains an assignment that makes use of left-hand side tuple unpacking, such as </p> <pre><code>E, F = 1, 2 </code></pre> <p>then the naive code above will only recognize that <code>F</code> is not a dependency.</p></li> </ul>
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    1. POFind dependencies in a python source/script
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    1. POFind dependencies in a python source/script
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    1. COThank you very much! That's a start ;) I guess, if I get my coworkers to write those scripts with "variables" all uppercase and not using single line multiple assignments I could use it ;)
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    2. COOr convince your coworkers to write runnable code that makes dependencies explicit. A function perhaps?
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    3. COAlso, as far as `exec source in deps` is concerned, it does not matter if `deps` contains keys for variable names which are not dependencies. The `source` redefines them anyway. So, for example, if you are bug-testing by generating random values to use in `deps`, then it is okay if your definition of dependency is overly broad.
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