PyCharm breakpoint action

If we want to change a variable value to effect specific code path in debug mode at some break point in PyCharm for Python code, but we do not want to change the code or configuration, and we do not want to do this manually at the break point console window each time it is hit, then we can do it programmingly by using break point condition side effects. For example, if we want to change the varible self.multiprocessing_num_processes to 1 to avoid parallel processing that may crash a test machine with not enough memory, we can use the following break point condition:

(self.multiprocessing_num_processes==1) or (setattr(self, 'multiprocessing_num_processes',1)!=[])

This change will be automatically made if we run and hit the break point, but it will not be triggered if we step through to pass the break point.