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Iterative primitives (loops) in Python include while and for loops. While loops execute code based on a condition until it becomes false; they require an exit strategy to avoid infinite loops. For loops iterate over sequences like lists or strings, providing a structured way to perform repetitive tasks. The range function generates a sequence of numbers useful with for loops. String operations in Python include accessing characters, slicing, and using methods like upper(), lower(), and find(). Lists are mutable sequences that can contain various types of elements; they support operations like append, extend, sort, and slicing. List comprehensions offer
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- Iterative primitives (loops) in Python include while and for loops; while loop executes code as long as a condition is true, for loop iterates over sequences.
- Key points about while loop: includes an "exit strategy" to avoid infinite loops, break keyword allows early termination based on conditions, while True loop runs indefinitely until broken by break.
- Continue keyword skips current iteration and moves to the next one; for loop is used for known iterations or sequence traversal, simpler than while for predictable tasks.
- Range function generates a sequence of numbers useful with for loops, len() returns string length, slicing extracts substrings using start:end syntax, strings are immutable in Python.
- String methods like .upper(), .lower(), .strip() manipulate content without changing the original; in operator checks substring presence case-sensitively, comparison operators compare ASCII values.
- List is an ordered, mutable sequence of elements (can be mixed types), supports operations like append, extend, remove, sort, and reverse; len() and sum() are useful for lists, join() and split() facilitate conversion between strings and lists.
- Equality checks in Python: == checks semantic equality, is checks if two variables point to the same object in memory; list comprehensions provide concise ways to create new lists based on existing ones or conditions.
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