[ python-Bugs-973092 ] inspect.getframeinfo bug if 'context' is to big

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Bugs item #973092, was opened at 2004-06-15 11:09
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Category: Python Library
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Hans Georg Krauthaeuser (krauthae)
Assigned to: Nobody/Anonymous (nobody)
Summary: inspect.getframeinfo bug if 'context' is to big 

Initial Comment:
In inspect.getframeinfo index gets wrong if context is
larger than len(lines).

the lines are:
...
    if context > 0:
        start = lineno - 1 - context//2
        try:
            lines, lnum = findsource(frame)
        except IOError:
            lines = index = None
        else:
            start = max(start, 1)
            start = min(start, len(lines) - context)
            ^^^^^^^^^^^^^^^^^^^^^^^^
            lines = lines[start:start+context]
            index = lineno - 1 - start
    else:
        lines = index = None
...

The 'min' statement gives a negative start if context
is to large. As a result index gets to large.

The solution is just to put

context = min(context,len(lines))

after the first 'else:'

Regards

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