Created
September 25, 2017 18:21
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Counting inner calls in an unknown function, incorrect code demonstration
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| import sys | |
| global_counter = 0 | |
| def count_calls(func, *args, **kwargs): | |
| """Count calls in function func""" | |
| calls = [ -1 ] | |
| def tracer(frame, event, arg): | |
| global global_counter | |
| if event == 'call': | |
| global_counter += 1 | |
| calls[0] += 1 | |
| return tracer | |
| sys.settrace(tracer) | |
| rv = func(*args, **kwargs) | |
| return calls[0], rv | |
| def add(a, b): | |
| return a + b | |
| calls, value = count_calls(add, 1, 1) | |
| print('Now after execution of "count_calls" the global attribute "global_counter" should be 1, but is not because we are calling "print" and this is also profiled (i.e. "global_counter": %s), we can see any way that our function is returing the correct number of calls: %s) ' % (global_counter, calls)) | |
| global_counter = 0 |
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