Clean up text.
Keep the original safe.

Text is a sequence of characters. Methods such as lower(), upper(), strip(), replace(), split(), and join() help real programs clean and organize user input.

01 Learn02 Try03 Predict

01 Learn

String methods return new text instead of changing the original string.

Text is a sequence of characters. Methods such as lower(), upper(), strip(), replace(), split(), and join() help real programs clean and organize user input.

message = "  Hello Python  "

cleaned = message.strip().lower()
print(cleaned)

words = "Ana,Marko,Jelena".split(",")
print(words)

strip() and lower() produce a new cleaned string. split() turns comma-separated text into a list of words.

hello python
['Ana', 'Marko', 'Jelena']

Change one value, then explain how the resulting data changes.

↳

Keep this in mind: Follow each data operation in order before predicting the result.

Try it

name = "  ANA  "

cleaned = name.strip().lower()
print(cleaned)
print(name)

words = "Ana,Marko,Jelena".split(",")
print(" | ".join(words))
# Try upper(), replace(), or different text

Run the example, then change one value and observe the result.

02 Try

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03 Predict

What will this program print?

Read each data operation before choosing an answer.

message = "  PyThOn tutor  "
cleaned = message.strip().lower().replace(" ", "-")
print(cleaned)
print(message)

Your learning mentor

Ask Sloby about string methods

Describe what feels unclear and Sloby will guide your reasoning.

Hi! I'm Sloby. Let's clean and transform Python text together.

04 Understanding Check

What will this program print, and why does original keep its spaces and capitalization? Explain strip(), lower(), split(), and join().

original = "  Ana, Marko  "
cleaned = original.strip().lower()
parts = cleaned.split(", ")

print(original)
print(parts)
print("-".join(parts))