Finding index of the same elements in a list
Suppose I have to find each index of letter 'e' in the word "internet":
letter = 'e'
word = 'interne开发者_StackOverflow社区t'
idx = word.index(letter)
But this code gives only the first index. How can I find the rest of them?
Try using enumerate in a list comprehension:
[index for (index, letter) in enumerate(word) if letter == 'e']
Mark's answer is better for a single letter. I'm adding this in case your real substring is longer than a single character.
If you want to use str.index()
, it can take an optional start
position and will raise
a ValueError
if the desired substring is not found:
>>> letter = 'e'
>>> word = 'internet'
>>> last_index = -1
>>> while True:
... try:
... last_index = word.index(letter, last_index + 1)
... print last_index
... except ValueError:
... break
...
3
6
Try this:
word = 'internet'
letter = 'e'
[i for i in xrange(len(word)) if word[i] == letter]
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