Concatenate python string from list entries [duplicate]

Question

Lets say that I have a list of strings that I would like to jam together into a single string separated by underscores. I know I can do this using a loop, but python does a lot of things without loops. Is there something in python that already has this functionality? For example I have:

string_list = ['Hello', 'there', 'how', 'are', 'you?']

and I want to make a single string like:

'Hello_there_how_are_you?'

What I have tried:

mystr = ''    
mystr.join(string_list+'_')

But this gives a "TypeError: can only concatenate list (not "str") to list". I know its something simple like this, but its not immediately obvious.

Martijn Pieters · Accepted Answer · 2015-04-10 16:39:40Z

35

You use the joining character to join the list:

string_list = ['Hello', 'there', 'how', 'are', 'you?']
'_'.join(string_list)

Demo:

>>> string_list = ['Hello', 'there', 'how', 'are', 'you?']
>>> '_'.join(string_list)
'Hello_there_how_are_you?'

answered Apr 10, 2015 at 16:39

Martijn Pieters

1.1m326 gold badges4.2k silver badges3.4k bronze badges

Sign up to request clarification or add additional context in comments.

Comments

veda905 · Accepted Answer · 2015-04-10 16:41:51Z

1

Got it I used:

mystr+'_'.join(string_list)
'Hello_there_how_are_you?'

I wanted to use the join function from the string, not the list. Seems obvious now.

answered Apr 10, 2015 at 16:41

veda905

7722 gold badges14 silver badges33 bronze badges

1 Comment

Martijn Pieters Over a year ago

You don't need to use mystr at all here; it is just an empty string.

Collectives™ on Stack Overflow

Concatenate python string from list entries [duplicate]

2 Answers 2

Comments

1 Comment

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Linked

Related