Created
October 7, 2015 15:27
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#!/usr/bin/env python3 | |
def sw(op): | |
return [lambda a, b: a + b, | |
lambda a, b: a - b, | |
lambda a, b: a * b, | |
lambda a, b: a / b, | |
lambda a, b: "err: operação inválida!"]['+-*/'.find(op)] | |
from sys import argv | |
if len(argv) != 4: | |
print( | |
"""Usage: | |
{0} num_1 op num_2 | |
Ex.: | |
{0} 2 + 2 | |
4.0""".format(argv[0])) | |
exit(-1) | |
num_1, op, num_2 = argv[1:] | |
num_1 = float(num_1) | |
num_2 = float(num_2) | |
print(sw(op)(num_1, num_2)) |
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