The '_'.join(list) method on the underscore string '_' glues together all strings in the list using the underscore string as a delimiter—and returns a new string. For example, the expression '_'.join(['a', 'b', 'c']) returns the new string 'a_b_c'.
Definition and Usage
The string.join(iterable) method joins the string elements in the iterable to a new string by using the string on which it is called as a delimiter.
Here’s a short example:
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 friends are concatenated using the delimiter string '' in the first example and the underscore character '_' 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:
string.join(iterable)
| Argument | Description |
|---|---|
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:
Exercise: Guess the output and check if you were right by running the interactive code shell.
Where to Go From Here?
Enough theory, let’s get some practice!
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