'_'.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
Definition and Usage
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.
- Python Join List [Ultimate Guide]
- Python Concatenation
- Python How to Concatenate Lists
- The Ultimate Guide to Python Lists
You can call this method on each list object in Python. Here’s the syntax:
|The elements to be concatenated.|
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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While working as a researcher in distributed systems, Dr. Christian Mayer found his love for teaching computer science students.
To help students reach higher levels of Python success, he founded the programming education website Finxter.com. He’s author of the popular programming book Python One-Liners (NoStarch 2020), coauthor of the Coffee Break Python series of self-published books, computer science enthusiast, freelancer, and owner of one of the top 10 largest Python blogs worldwide.
His passions are writing, reading, and coding. But his greatest passion is to serve aspiring coders through Finxter and help them to boost their skills. You can join his free email academy here.