Dmitry Kazakov added the comment:
I think the reason this patch hasn't been discussed well is that it only
changes the behavior for traceback.*_tb functions that only deal with
tracebacks. I commented on the review page that we don't have to change the
behavior of traceback.*_stack functions to make it obvious. Let me show an
example:
import sys
def a():
b()
def b():
c()
def c():
d()
def d():
def e():
print_stack(limit=2) # Last 2 entries
''' Output:
File "file", line 331, in d
e()
File "file", line 328, in e
print_stack(limit=2) # Last 2 entries '''
raise Exception
e()
try:
a()
except Exception:
print_exc(limit=2) # 2 entries from the caller
''' Output:
Traceback (most recent call last):
File "file", line 336, in <module>
a()
File "file", line 318, in a
b()
Exception '''
If we decide to unify the behavior of *_tb and *_stack functions, the change
will break some existing code, although the breakage will be purely cosmetic.
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<http://bugs.python.org/issue22619>
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