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Strings and Operators (Python)

Learning Objectives

• Perform slicing and indexing.
• Use common string methods.
• Apply arithmetic, logical, identity, and membership operators.

Example

text = "Programming"
print(text[0:4])
print(text[-3:])
print(text.upper())

a, b = 10, 3
print(a + b, a > b, a in [10, 20])

Dry Run

• text[0:4] -> Prog
• text[-3:] -> ing
• a > b -> True

Common Mistakes

• Wrong slice end index expectations.
• Confusing is with == for value comparison.

Practice

1. Count vowels in a string.
2. Build expression evaluator for arithmetic operators.