[issue38054] enhance pdb.set_trace() to run when the specified condition is true

[Alexander Ulyanov]

Alexander Ulyanov <alex.ulnv at gmail.com> added the comment:

Perhaps it's a matter of preference. I found it convenient, since passing in a boolean expression allows me to get rid of extra if-blocks thus reducing lines of code and increasing debugging speed. I wanted to share my idea with the community - but please feel free to close the issue if you find it trivial.

############## SAMPLE USE CASE ##############
import pdb

def square(i):
	pdb.set_trace(trigger=not isinstance(i, (float, int)))
	print(i**2)

# debug: hunting for TypeError
a = 2
square(a) # will not execute set_trace()
b = None
square(b) # will execute set_trace()

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38054>
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