python 中的 if 语句、while 循环和字典有问题

Question

men = {1111111111: 'Amal', 2222222222: 'Mohammed', 3333333333: 'Khadijah', 4444444444: 'Abdullah', 5555555555: 'Rawan',
       6666666666: 'Faisal', 7777777777: 'Layla'}


def mo():
    r = int(input('Please Enter The Number: '))
    if r in men:
        print(men[r])
    elif r not in men:
        print('Sorry, the number is not found')
    elif r >= 11:
        while r >= 11:
            r = r + 1 == 1
            print('This is invalid number')
mo()

我在 elif 中遇到问题。我想要的是，如果我在控制台中写入超过 10 个字符，那么代码将打印 'This is invalid number'。但是代码打印 'Sorry, the number is not found'.

输出：

Please Enter The Number: 111111111111111
Sorry, the number is not found

Process finished with exit code 0

Answer 1

我不确定您为什么要在代码中使用 while 循环和 r = r + 1 == 1。但我猜你想要这样的东西：

men = {1111111111: 'Amal', 2222222222: 'Mohammed', 3333333333: 'Khadijah', 4444444444: 'Abdullah', 5555555555: 'Rawan',
       6666666666: 'Faisal', 7777777777: 'Layla'}


def mo():
    r = int(input('Please Enter The Number: '))
    if r in men:
        print(men[r])
    elif len(str(r)) >= 11:
        print('This is invalid number')
    elif r not in men:
        print('Sorry, the number is not found')
mo()

Answer 2

if / elif / else

运行直到满足第一个条件。在您的情况下，满足的第一个条件是 r not in men

if(condition):
  do something
elif(condition):
  do something else
elif(condition):
  do something else
else:
  do something

您可以 re-order 它们，以便在检查它是否在字典中之前进行长度检查。

Answer 3

ksohan 发布的答案是正确的，但有一个问题。你想要的是如果输入的数字大于 10 个字符，那么控制台将打印 'This is invalid number'。如果你想比较字符的长度，那么你应该首先将 r 变量类型转换为字符串，然后将其长度与 10.

进行比较

试试这个：

men = {1111111111: 'Amal', 2222222222: 'Mohammed', 3333333333: 'Khadijah', 4444444444: 'Abdullah', 5555555555: 'Rawan',
       6666666666: 'Faisal', 7777777777: 'Layla'}


def mo():
    r = int(input('Please Enter The Number: '))
    if r in men:
        print(men[r])
    elif len(str(r)) > 10:
        print('This is invalid number')
    elif r not in men:
        print('Sorry, the number is not found')
mo()

python 中的 if 语句、while 循环和字典有问题

I have a problrm with if statement and while loop and dictionary in python

python

dictionary

loops

if-statement

while-loop