数组 python || 时间.strftime

Question

i want a print current index of array using:

import os
import datetime
import time

a = time.strftime("%d", time.localtime())
list1 = ["123", 123, 123, 132, 123, 123, 123, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
print(list1[a])
input('Press ENTER to exit')

But console is close What happen?

Answer 1

I dont think you can pass a string to a list index

print(list1[a]) # Lists take integers as indices

Answer 2

I don't know what does it means that the console is closing without an error.

when running you code I get the following, using python 2.7 :

>>> print(list1[a])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: list indices must be integers, not str

This is caused because the return of time.strftime("%d", time.localtime()) is a string variable.

The change in your code needs to be:

print(list1[int(a)])

which will transform that string into an integer.

do notice that there is a lot of issue you need to take care of:

1. make sure that the number string you assigning to a is valid
2. make sure you you don't enter an index that does not exist

Answer 3

Try this instead, i hope it gives you the output you needed!

a = int(time.strftime("%d", time.localtime()))
list1 = ["123", 123, 123, 132, 123, 123, 123, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
print(list1[a])