Python: code statistics

Question

Do you know if there's a Python library that generates statistics about code? I'm thinking about pointing to a package and getting number of classes, functions, methods, docblock lines etc.

It could eventually include useless stuff like number of lambdas or other crazy statistics, just for fun.

Answer 1

People don't generally make packages out of things that can be done in a dozen or two lines of code. The following analyzes usage of all python syntax and returns a dictionary mapping ast nodes to how many times that node came up in the source. Examples showing the number of def and class statements are below it as well.

import collections
import os
import ast

def analyze(packagedir):
    stats = collections.defaultdict(int)
    for (dirpath, dirnames, filenames) in os.walk(packagedir):
        for filename in filenames:
            if not filename.endswith('.py'):
                continue

            filename = os.path.join(dirpath, filename)

            syntax_tree = ast.parse(open(filename).read(), filename)
            for node in ast.walk(syntax_tree):
                stats[type(node)] += 1   

    return stats

print("Number of def statements:", analyze('.')[ast.FunctionDef])
print("Number of class statements:", analyze('.')[ast.ClassDef])

Answer 2

you can have a look at Pymetrics, or check other tools enumerated there