对输入的两个分数进行+、-*、/四则运算,输出最简分数结果
最简结果要求分母和分子互质(没有除1之外的公因子)
难点主要是输入的分数长度不固定,如果可以用正则式就简单了:
import re
from fractions import Fraction
f = input()
a = re.findall(r'(\d+)/(\d+)(.)(\d+)/(\d+)',f)
if len(a[0]) == 5 and a[0][2] in '+-*/':
f1 = Fraction(int(a[0][0]), int(a[0][1]))
f2 = Fraction(int(a[0][3]), int(a[0][4]))
if a[0][2] == '+':
print(f'{f1}+{f2}={f1+f2}')
elif a[0][2] == '-':
print(f'{f1}-{f2}={f1-f2}')
elif a[0][2] == '*':
print(f'{f1}*{f2}={f1*f2}')
else:
print(f'{f1}/{f2}={f1/f2}')
else:
print('Input Error!')