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What is a String?
In Python, a string (data type str) is a sequence of characters enclosed in single quotes ('...') or double quotes ("...").
Real-world analogy
Imagine letters printed on a train boxcar or beads threaded on a necklace. Each character sits in a specific order along the string. You can inspect individual letters, count how many there are, or format the message for display!
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Text Representation
Stores words, sentences, code, symbols, or even numbers formatted as text.
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Zero-Indexed Sequence
Each character has an index position starting at 0.
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Immutable
Strings cannot be changed in-place. Modifying a string creates a new string.
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Length with len()
Use len(text) to get the total character count.
Key vocabulary
- String Literal — text enclosed in quotes written directly in your code.
- Character — a single letter, number, space, or symbol inside a string.
- Immutability — once created, a string's internal content cannot be altered.
- Escape Sequence — special characters preceded by a backslash like
\n(newline) or\"(quote).
🧪 Compact String Playground
Run the script below to inspect a string and check its character count using len():
🧪 Compact String Playground
Ready to run
Python ScriptEditable
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Variable Inspector
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Run your Python code to see them appear here live!
Variable Inspector
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Run your Python code to see them appear here live!
Output & Console
Output Console
Press Run Code above to see Python output here.
Real Python Execution & Tracing
Interactive input() Supported