How to find the python list item that start with

Question

I have the list that contains some items like:

"GFS01_06-13-2017 05-10-18-38.csv"
"Metadata_GFS01_06-13-2017 05-10-18-38.csv"

How to find the list item that start with "GFS01_"

In SQL I use query: select item from list where item like 'GFS01_%'

`[x for x in list if x.startswith('GFS01_')]` returns a list of items that startswith what you want — Ludisposed, Jun 13 '17 at 09:17
and if you **just** want to get the next item with that property you can do `next(x for x in list if x.startswith('GFS01_'))` — Ma0, Jun 13 '17 at 09:20
Result will give ['GFS01_06-13-2017 05-10-18-38.csv'], how to remove [' & '], please help — Learnings, Jun 13 '17 at 09:30

score 85 · Accepted Answer · edited Nov 13 '19 at 20:32

85

You have several options, but most obvious are:

Using list comprehension with a condition:

result = [i for i in some_list if i.startswith('GFS01_')]

Using filter (which returns iterator)

result = filter(lambda x: x.startswith('GFS01_'), some_list)

edited Nov 13 '19 at 20:32

GabLeRoux

answered Jun 13 '17 at 09:26

temasso

Result will give ['GFS01_06-13-2017 05-10-18-38.csv'], how to remove/replace [' & '] – Learnings Jun 13 '17 at 09:37
@linus What do you mean by _remove/replace [' & ']_ ? – temasso Jun 13 '17 at 09:42
I want to replace " [' " and " '] " with blank from results – Learnings Jun 13 '17 at 09:45
@linus I don't fully understand your problem, but there should not be any other items in results apart from those started with 'GFS01_'. – temasso Jun 13 '17 at 09:50
(str(sourceFileName).replace("['","")).replace("']","") this is working...if you have better version please update... – Learnings Jun 13 '17 at 09:51
It retuns in the form of a list, if you want output in form of string do `for x in result: print x` I suggest looking up some of the basics of lists in the pythondocs – Ludisposed Jun 13 '17 at 09:54

score 4 · Answer 2 · answered Jun 13 '17 at 09:20

4

You should try something like this :

[item for item in my_list if item.startswith('GFS01_')]

where "my_list" is your list of items.

answered Jun 13 '17 at 09:20

RyanU

Result will give ['GFS01_06-13-2017 05-10-18-38.csv'], how to remove/replace [' & '] – Learnings Jun 13 '17 at 09:37

score 1 · Answer 3 · answered Jul 23 '18 at 09:03

If you really want the string output like this "GFS01_06-13-2017 05-10-18-38.csv","GFS01_xxx-xx-xx.csv", you could try this:

', '.join([item for item in myList if item.startswith('GFS01_')])

Or with quotes

', '.join(['"%s"' % item for item in myList if item.startswith('GFS01_')])

Filtering of list will gives you list again and that needs to be handled as per you requirement then.

3 Answers3