python join list of strings example
To connect a string list in Python, you should use the .join() method of the string; 1. This method is called with a delimiter string, such as ' '.join(list); 2. The list must be of string type, otherwise you need to first use map(str, list) or list derivation conversion; 3. Common separators include spaces, commas, empty strings or newlines; 4. The wrong usage is to call join() as a list method, and the correct syntax is separator.join(list_of_strings).
When you want to join a list of strings in Python, the most common and efficient way is to use the .join() method. Here's a clear example:
Basic Example
words = ['Hello', 'world', 'from', 'Python'] sentence = ' '.join(words) print(sentence) # Output: Hello world from Python
In this case, ' ' (a single space) is the separator, and .join() combines all strings in the list into one.
Key Points:
- The
.join()method is called on the separator string (eg,' ',',','-'). - It only works with lists of strings — if your list contains numbers or other types, you need to convert them first.
More Examples with Different Separators
# Comma and space items = ['apple', 'banana', 'cherry'] result = ', '.join(items) print(result) # Output: apple, banana, cherry # No separator result = ''.join(items) print(result) # Output: applebananacherry # Newline separator lines = ['First line', 'Second line', 'Third line'] result = '\n'.join(lines) print(result) # Output: # First line # Second line # Third line
Handling Non-String Values
If your list has numbers or mixed types, convert them first:
numbers = [1, 2, 3, 4] result = ', '.join(map(str, numbers)) print(result) # Output: 1, 2, 3, 4
Alternatively:
result = ', '.join([str(x) for x in numbers])
Common Mistake
Don't do this:
words = ['a', 'b', 'c'] # Wrong: # result = words.join(' ') # AttributeError
.join() is a string method, not a list method.
So remember:
separator.join(list_of_strings)
That's the correct pattern.
Basically just pick your separator and plug in your list of strings. Pretty straightforward once you get the syntax.
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