TypeError: list indices must be integers or slices, not str 'convert the chararter'

问题

Number = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]    
for n in range(0, 20):
      print(Number[n]+1\n)
InputNum3 = input()
Number[InputNum3] = ''.join(str('-'))

want:

1       2
     3
     4
     .... 20

input 2

want:

1
      -
      3
      4...20

but the result is:

TypeError: list indices must be integers or slices, not str

回答1:

Do:

inputNum3 = int(input())

to get an Integer, you can't access lists by a String as index.

Your variable names should start with lowercase. Generally snakecase too, with all lowercase separated by underscore:

number = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]
input_num = int(input())
number[input_num] = "-"

You don't need the .join() here because you want to have just a single character anyway.

You can also fill your number list like so:

number = [x for x in range(20)]

This is called a list comprehension.

Lastly, you can just do print(number) if you want to print the full list, no need for the for loop.

If you want to print all list elements from index x to y you can use list slicing:

number[3:15] for example.

See here for more examples of slices.

回答2:

In Python3, input() returns a string. In Python2, however, input() returns the type you are looking for, an integer. Therefore, you need to cast the input() function to an int, since you are obviously trying to assign a value in the list by index.

Number = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]    
for n in range(0, 20):
   print(Number[n]+1\n)

InputNum3 = int(input())
Number[InputNum3] = ''.join(str('-'))

回答3:

Number = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]    
for n in range(0, 20):
      print(Number[n]+1\n)
>>InputNum3 = int(input())
Number[InputNum3] = ''.join(str('-'))

input function accept values as string.

来源：https://stackoverflow.com/questions/44372559/typeerror-list-indices-must-be-integers-or-slices-not-str-convert-the-charart