How to find the position of an element in a list , in Python?

for s in stocks_list:
 开发者_如何学Python   print s

how do I know what "position" s is in? So that I can do stocks_list[4] in the future?

If you know what you're looking for ahead of time you can use the index method:

>>> stocks_list = ['AAPL', 'MSFT', 'GOOG']
>>> stocks_list.index('MSFT')
1
>>> stocks_list.index('GOOG')
2

for index, s in enumerate(stocks_list):
    print index, s

[x for x in range(len(stocks_list)) if stocks_list[x]=='MSFT']

The position is called by stocks_list.index(s), for example:

for s in stocks_list:
    print(stocks_list.index(s))