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I want to handle AssertionErrors both to hide unnecessary parts of the stack trace from the user and to print a message as to why the error occurred and what the user should do about it.
Is there any way to find out on which line or statement the assert failed within the except block?
try:
assert True
assert 7 == 7
assert 1 == 2
# many more statements like this
except AssertionError:
print 'Houston, we have a problem.'
print
print 'An error occurred on line ???? in statement ???'
exit(1)
I don't want to have to add this to every assert statement:
assert 7 == 7, "7 == 7"
because it repeats information.
解决方案
Use the traceback module:
import sys
import traceback
try:
assert True
assert 7 == 7
assert 1 == 2
# many more statements like this
except AssertionError:
_, _, tb = sys.exc_info()
traceback.print_tb(tb) # Fixed format
tb_info = traceback.extract_tb(tb)
filename, line, func, text = tb_info[-1]
print('An error occurred on line {} in statement {}'.format(line, text))
exit(1)
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