INTRODUCTION TO PYTHON VARIABLE, IDENTIFIER AND STRINGS
Variables and Identifiers
Variables: Store data in a program
Identifiers: Names for variables, functions, and classes
Rules:
Start with letter or underscore
Contain letters, digits, and underscores
Case-sensitive
Strings
Sequences of characters in quotes ("") or apostrophes ('')
Types: single-quoted, double-quoted, triple-quoted (multiline)
Operations: concatenation (+), repetition (*)
String Slicing
Extracting a subset of characters
Syntax: string[start:stop:step]
start: inclusive, stop: exclusive, step: increment (default=1)
Examples: "Hello"[1:4] = "ell", "Hello"[::2] = "Hlo", "Hello"[::-1] = "olleH"
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