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import time import re d = re.compile(r'^[+-]?\d+$') def is_integer_re(value): return d.match(value) def is_integer(value): return value[0] in '+-0123456789' and all(x in '0123456789' for x in value[1:]) start = time.time() for i in range(100000): is_integer_re(str(i)) print(time.time() - start) start = time.time() for i in range(100000): is_integer(str(i)) print(time.time() - start)
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