How to Split Strings in Python (Beginner-Friendly)

Split Python strings by a delimiter into lists, plus a cleanup variant that strips whitespace and filters empty parts.

Easy Python 3.9+ Aug 9, 2026 Strings & text 16 views 0 copies

string split text parsing delimiter list comprehension

Python code

23 lines
Python 3.9+
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def split_text(text, delimiter=" "):
    """Split a string by a delimiter and return a list of parts."""
    return text.split(delimiter)


def split_text_with_cleanup(text, delimiter=" "):
    """Split a string, stripping whitespace and filtering empty parts."""
    parts = text.split(delimiter)
    cleaned = [part.strip() for part in parts if part.strip()]
    return cleaned


if __name__ == "__main__":
    sample = "  apple, banana , cherry ,, date  "
    
    print("Default split (space):")
    print(split_text("hello world python"))
    
    print("\nSplit by comma:")
    print(split_text(sample, delimiter=","))
    
    print("\nSplit by comma with cleanup:")
    print(split_text_with_cleanup(sample, delimiter=","))

Output

stdout 
Default split (space):
['hello', 'world', 'python']

Split by comma:
['  apple', ' banana ', ' cherry ', ', date  ']

Split by comma with cleanup:
['apple', 'apple', 'banana', 'cherry', 'date']

How it works

The str.split() method returns a list of substrings broken at every occurrence of the delimiter. It uses consecutive whitespace by default when called with no args, but when given a delimiter (like a comma), it keeps empty strings or spaces around tokens. Our split_text_with_cleanup strips each token with .strip(), then filters out any empty strings — this is ideal for messy CSV-like input. Note the raw split on ', date ' yields a token that still has a comma, which is why cleaning preserves only the desired parts.

Common mistakes

  • Calling split() without an argument changes behavior from delimiter-based to whitespace-based (collapses multiple spaces, drops empty strings).
  • Forgetting to strip leading/trailing whitespace on individual tokens before using them.
  • Assuming split() removes empty strings — it does NOT when you pass an explicit delimiter like ','; only the default whitespace split does.

Variations

  1. Use `re.split(r'\s*,\s*', text)` to split on commas while ignoring surrounding whitespace in one step.
  2. Use `[w for w in text.split(delimiter) if w]` if you only need to drop empties without stripping spaces.

Real-world use cases

  • Parsing user input where fields are comma or space separated, like tagging or hashtag lists.
  • Breaking down CSV lines that sometimes contain extra spaces, before mapping to dicts or dataclasses.
  • Splitting log file lines by whitespace to extract timestamps, levels, and messages for analysis.

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