[Tut] Python Join List with Underscore [The Most Pythonic Way]

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Python Join List with Underscore [The Most Pythonic Way]

The

Code:

'_'.join(list)

method on the underscore string

Code:

'_'

glues together all strings in the

Code:

list

using the underscore string as a delimiter—and returns a new string. For example, the expression

Code:

'_'.join(['a', 'b', 'c'])

returns the new string

Code:

'a_b_c'

.

Definition and Usage

The

Code:

string.join(iterable)

method joins the string elements in the

Code:

iterable

to a new string by using the

Code:

string

on which it is called as a delimiter.

Here’s a short example:

Code:

friends = ['Alice', 'Bob', 'Carl'] # Empty delimiter string '' print(''.join(friends)) # AliceBobCarl # Delimiter string '_' print('_'.join(friends)) # Alice_Bob_Carl

The string elements in the list

Code:

friends

are concatenated using the delimiter string

Code:

''

in the first example and the underscore character

Code:

'_'

in the second example.

Related articles:

• Python Join List [Ultimate Guide]
  
  
• Python Concatenation
  
  
• Python How to Concatenate Lists
  
  
• The Ultimate Guide to Python Lists
  

Syntax

You can call this method on each list object in Python. Here’s the syntax:

Code:

string.join(iterable)

Argument |
Description

Code:

iterable

|
The elements to be concatenated.

Code Puzzle

To practice what you’ve learned so far, feel free to solve the following interactive code puzzle:

https://trinket.io/embed/python/21de9b905d

Exercise: Guess the output and check if you were right by running the interactive code shell.

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