22.10.18 02:16, Terry Reedy пише:
All
functions created from lambda expressions get the same pseudo-name
'<lambda>'. This can make tracebacks worse. Perhaps more importantly,
proper testing may become harder.
See https://bugs.python.org/issue34856. But this can work only while
lambda's body is a simple expression.
>>> for i in map(lambda x: x **
2, 'abc'):
print(i)
Traceback (most recent call last):
File "<pyshell#19>", line 2, in <module>
2, 'abc'):
File "<pyshell#19>", line 2, in <lambda>
2, 'abc'):
TypeError: unsupported operand type(s) for ** or pow(): 'str' and 'int'
In 3.8 the traceback is different (an can be even more informative with
resolved issue34856).
Traceback (most recent call last):
File "1.py", line 1, in <module>
for i in map(lambda x: x **
File "1.py", line 1, in <lambda>
for i in map(lambda x: x **
TypeError: unsupported operand type(s) for ** or pow(): 'str' and 'int'
Given that there might be a hundred functions named '<lambda>', I think
the specific name is a bit helpful.
I think the main problem is not with tracebacks, but with reprs. If you
have a pack of callbacks, it is not easy to figure out what they do if
they are anonymous functions.
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