Python Fundamentals: Using While Loops with Composite Data Types
This note explains Python's while loop, detailing its three-part structure, special considerations such as the one‑time initial condition, lack of ++/-- operators and do‑while syntax, and provides a concrete example that prints "hello world" ten times.
Python’s while loop is introduced as a basic control‑flow tool for repeating actions, especially when working with composite data types.
The loop consists of three parts:
Initial condition – executed only before the first iteration.
Loop body – the statements run while the condition holds.
Update condition – typically modifies variables to eventually break the loop.
Key notes for Python:
The initial condition runs only once; it is not re‑evaluated on each pass.
Python does not support ++ or -- increment operators.
There is no native do‑while construct.
Example code demonstrates printing "hello world" ten times using a while loop:
num = 0</code><code>while num < 10:</code><code> print("hello world")</code><code> num += 1The output consists of ten consecutive "hello world" lines, confirming the loop’s correct operation.
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