Question

print ('Welcome to Calculator')
a = int(input('Enter your first value'))
b = int(input('Enter your second value'))
print ('''Addition - type 1
Subtraction - type 2
Multiplication - type 3 
Division - type 4''')
procedure = input('Enter a option')
while (procedure != '1') or (procedure != '2') or (procedure != '3') or (procedure != '4'):
    procedure = input('Please choose the correct option')
def process ():
    if procedure == '1':
        print (a+b)
    elif procedure == '2':
        print(a-b)
    elif procedure == '3':
        print (a*b)
    elif procedure == '4':
        print (a/b)
    else:
        print('There is some error in code')
process ()

在这个中，我希望只要过程的值不是1,2,3,4，循环就会继续，但是循环继续循环。请告诉错误如何正确执行

Answer 1

用AND替换OR，然后查看结果。想到AND（union（联合））和OR（∩（交集））的意义以及你所写的条件，你一定会明白什么是错的...

python'或'不适用于

1 个答案: