Adding letters to each element of a list

Question

I try to add "G:" in the beginning and a backslash before every point of each element in a list. Therefore I created this example list1:

list1 = ['AEX.EN', 'AXAL.OQ', 'AAPIOE.NW']

And I need something like list2:

list2 = ['G:AEX\.EN', 'G:AXAL\.OQ', 'G:AAPIOE\.NW']

Thank you very much for the help!

How would you do it if you only had one element that you needed to modify? — Alexander, Oct 26 '21 at 12:49
For only one element I tried it with .insert(0,"G:") but the position of the backslash is not always the same. — fjurt, Oct 26 '21 at 12:55
Note that Stack Overflow expects you to search for existing solutions before posting a question. This is a common question with many answers out there. — jarmod, Oct 26 '21 at 12:59
@jarmod sorry, I am quite new here & I will do that next time — fjurt, Oct 26 '21 at 13:03
can anyone explain why escape characters are working in string in list but outside list strings behave normal? — ujjwal_bansal, Oct 26 '21 at 15:43

score 1 · Accepted Answer · answered Oct 26 '21 at 12:54

1

Use:

>>> ['G:' + i.replace('.', '\\.') for i in list1]
['G:AEX\\.EN', 'G:AXAL\\.OQ', 'G:AAPIOE\\.NW']
>>>

In this case I prefer re.escape:

>>> import re
>>> ['G:' + re.escape(i) for i in list1]
['G:AEX\\.EN', 'G:AXAL\\.OQ', 'G:AAPIOE\\.NW']
>>>

answered Oct 26 '21 at 12:54

U13-Forward

score 1 · Answer 2 · answered Oct 26 '21 at 12:55

1

You can use + for join string then use replace() like below:

>>> list1 = ['AEX.EN', 'AXAL.OQ', 'AAPIOE.NW']

>>> [('G:'+l).replace('.','\.') for l in list1]
['G:AEX\\.EN', 'G:AXAL\\.OQ', 'G:AAPIOE\\.NW']

answered Oct 26 '21 at 12:55

I'mahdi

> list2 = ['G:AEX\.EN', 'G:AXAL\.OQ', 'G:AAPIOE\.NW'] >print(list2) > OUTPUT: ['G:AEX\\.EN', 'G:AXAL\\.OQ', 'G:AAPIOE\\.NW'] for i in list2: print(i) > OUTPUT: G:AEX\.EN G:AXAL\.OQ G:AAPIOE\.NW Why this is happening? – ujjwal_bansal Oct 26 '21 at 15:44
@ujjwal_bansal this happen in python, you can read [here](https://stackoverflow.com/questions/6477823/display-special-characters-when-using-print-statement) or [here](https://stackoverflow.com/questions/32491682/how-to-print-in-python) – I'mahdi Oct 26 '21 at 16:39

2 Answers2