python实现加减乘除计算：
# coding = utf-8
def add(num1, num2):
return num1 + num2
def minus(num1, num2):
return num1 - num2
def multiply(num1, num2):
return num1 * num2
def divide(num1, num2):
if num2 == 0:
print('除数不能为0')
else:
return num1 / num2
print('选择运算：')
print('1 是 +')
print('2 是 -')
print('3 是 *')
print('4 是 /')
operator = input('输入您的选择(1/2/3/4)：')
num1 = int(input('输入第一个数：'))
num2 = int(input('输入第二个数：'))
if operator == '1':
print('{} + {} = {}'.format(num1, num2, add(num1, num2)))
elif operator == '2':
print('{} - {} = {}'.format(num1, num2, minus(num1, num2)))
elif operator == '3':
print('{} * {} = {}'.format(num1, num2, multiply(num1, num2)))
elif operator == '4':
print('{} / {} = {}'.format(num1, num2, divide(num1, num2)))
else:
print('这不是一个合法的运算符')
运行结果：
