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Helper function to time a function in Python.
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from timeit import timeit | |
def time_function(func, *args, **kwargs): | |
""" | |
Time the execution of a single function, and print out | |
the result. The function is invoked exactly once, and all | |
arguments are forwarded. Forwards the return value. | |
""" | |
MAX_PRINT = 30 | |
def format_arg(arg): | |
s = repr(arg) | |
if len(s) > MAX_PRINT: | |
s = s[:int(MAX_PRINT/2)] + '...' + s[-int(MAX_PRINT/2):] | |
return s | |
ret = None | |
def run(): | |
nonlocal ret | |
ret = func(*args, **kwargs) | |
t = timeit(run, number=1) | |
print('{}({}{}), t = {:.6f}s'.format( | |
func.__name__, | |
', '.join(format_arg(arg) for arg in args), | |
''.join(', {}={}'.format(k, format_arg(v)) for k, v in kwargs.items()), | |
t | |
)) | |
return ret | |
if __name__ == '__main__': | |
def factorial(n): | |
if n == 1: | |
return 1 | |
return n * factorial(n-1) | |
a = time_function(factorial, 5) | |
b = time_function(factorial, 100) | |
c = time_function(factorial, 500) | |
print('5!={}, 100!={}, 500!={}'.format(a, b, c)) |
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