How do I display the the index of a list element in Python? [duplicate]

问题

This question already has answers here:

Accessing the index in 'for' loops? (20 answers)

Closed 4 years ago.

I have a homework assignment. I've got the following code

hey = ["lol", "hey","water","pepsi","jam"]

for item in hey:
    print(item)

Do I display the position in the list before the item, like this:

1 lol
2 hey
3 water
4 pepsi
5 jam

回答1:

The best method to solve this problem is to enumerate the list, which will give you a tuple that contains the index and the item. Using enumerate, that would be done as follows.

In Python 3:

for (i, item) in enumerate(hey, start=1):
    print(i, item)

Or in Python 2:

for (i, item) in enumerate(hey, start=1):
    print i, item

If you need to know what Python version you are using, type python --version in your command line.

回答2:

Use the start parameter of the enumerate buit-in method:

>>> hey = ["lol", "hey","water","pepsi","jam"]
>>> 
>>> for i, item in enumerate(hey, start=1):
    print(i,item)


1 lol
2 hey
3 water
4 pepsi
5 jam

回答3:

Easy:

hey = ["lol","hey","water","pepsi","jam"]

for (num,item) in enumerate(hey):
    print(num+1,item)

来源：https://stackoverflow.com/questions/34753872/how-do-i-display-the-the-index-of-a-list-element-in-python