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

inspect.getsource から始めて、issue にある 2 つの例を再現します。次に、周辺の実装とソース抽出に関する既存のテストを調べます。同じ行を共有するラムダや、内包表記の構文にまたがるラムダについて、意図された動作を明確にし、何が返されるべきかを示す回帰テストのカバレッジを追加します。リンクされた pull request gh-143301 は、作業がすでに別の場所に移ったことを示しています。