inspect.getsource returns unrelated code

The documentation of inspect.getsource states:

Return the text of the source code for an object. [...]

But the function returns slightly more code. It returns all lines of source code that overlap the object, even if the rest of the lines belong to different objects.

For example, the following code creates two lambdas in the same line, so inspect.getsource will return the code of both lambdas instead of just one.

import inspect

# Two function declarations in the same line
x = lambda: 1; y = lambda: 2

# prints "x = lambda: 1; y = lambda: 2\n"
print(repr(inspect.getsource(y)))

The returned code is not even necessarily valid Python, as the following list comprehension demonstrates:

import inspect

funcs = [
    lambda: 1 for
    _ in range(3)
]

# prints '    lambda: 1 for\n', including indentation and a stray "for"
print(repr(inspect.getsource(funcs[0])))

Background

I was trying to access the abstract syntax tree of a function (for JIT compilation), but that does not appear to be possible for lambdas.

Linked PRs

• gh-143301

Commencez par inspect.getsource et reproduisez les deux exemples de l’issue. Examinez ensuite l’implémentation environnante et les tests existants concernant l’extraction du code source. Clarifiez le comportement attendu pour les lambdas partageant une ligne ou s’étendant sur une syntaxe de compréhension, et ajoutez une couverture de régression montrant ce qui devrait être renvoyé. Une pull request liée, gh-143301, indique que le travail a déjà été déplacé ailleurs.