In 3.12 findlinestarts seems to return None for line more often#1721
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rchiodo merged 1 commit intomicrosoft:mainfrom Nov 4, 2024
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In 3.12 findlinestarts seems to return None for line more often#1721rchiodo merged 1 commit intomicrosoft:mainfrom
rchiodo merged 1 commit intomicrosoft:mainfrom
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debonte
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Nov 4, 2024
debonte
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Nov 4, 2024
| min_line = sys.maxsize | ||
| for _, line in dis.findlinestarts(code_obj): | ||
| if line > max_line: | ||
| if line is not None and line > max_line: |
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I'm confused about how line can be None since dis.findlinestarts checks for None before yielding.
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I'm not sure what makes you say that? The docs at least say it can be none. dis.findlinestarts is supposed to call: https://docs.python.org/3/reference/datamodel.html#codeobject.co_lines.
I didn't check the source in CPython though
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Oh, I didn't notice that it wasn't our code. I just used "go to def"` and saw this. Turns out this is from my CPython 3.12.7 install.
def findlinestarts(code):
"""Find the offsets in a byte code which are start of lines in the source.
Generate pairs (offset, lineno)
"""
lastline = None
for start, end, line in code.co_lines():
if line is not None and line != lastline:
lastline = line
yield start, line
return
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Fixes #1720