Extract substrings from a list into a list in Python

Question

I have a Python list like:

['[email protected]', '[email protected]'...]

And I want to extract only the strings after @ into another list directly, such as:

mylist = ['gmail.com', 'hotmail.com'...]

Is it possible? split() doesn't seem to be working with lists.

This is my try:

for x in range(len(mylist)):
  mylist[x].split("@",1)[1]

But it didn't give me a list of the output.

Sure it is. Have you tried anything yourself yet? Did you look up how to split a single value, for example? — Martijn Pieters
– Martijn Pieters, Commented Jun 8, 2017 at 22:17
In other words, have you tried breaking this problem down into smaller parts that you could attempt to solve one by one? — Martijn Pieters
– Martijn Pieters, Commented Jun 8, 2017 at 22:18
@Madno: then your post would be greatly helped if you included that attempt. — Martijn Pieters
– Martijn Pieters, Commented Jun 8, 2017 at 22:19

calico_ · Accepted Answer · 2017-06-09 19:34:30Z

11

You're close, try these small tweaks:

Lists are iterables, which means its easier to use for-loops than you think:

for x in mylist:
  #do something

Now, the thing you want to do is 1) split x at '@' and 2) add the result to another list.

#In order to add to another list you need to make another list
newlist = []
for x in mylist:
     split_results = x.split('@')
     # Now you have a tuple of the results of your split
     # add the second item to the new list
     newlist.append(split_results[1])

Once you understand that well, you can get fancy and use list comprehension:

newlist = [x.split('@')[1] for x in mylist]

edited Jun 9, 2017 at 19:34

answered Jun 8, 2017 at 22:32

calico_

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Comments

dannyxn · Accepted Answer · 2017-06-08 22:29:14Z

0

That's my solution with nested for loops:

myl = ['[email protected]', '[email protected]'...]
results = []
for element in myl:
    for x in element:
        if x == '@':
            x =  element.index('@')
            results.append(element[x+1:])

answered Jun 8, 2017 at 22:29

dannyxn

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