For vs While Loops in Python

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For vs While Loops in Python

In Python, for and while loops are used for iteration, but they differ in structure and use cases.

for loop is used when you know the number of iterations in advance. It iterates over a sequence like a list, tuple, string, or range. It's concise and commonly used in data processing.

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for i in range(5):

    print(i)

This prints numbers from 0 to 4. The for loop automatically handles increment and stop conditions.

while loop is used when the number of iterations is unknown and depends on a condition. It keeps running as long as the condition is true.

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i = 0

while i < 5:

    print(i)

    i += 1

Here, the loop continues until i becomes 5. If the condition is never false, it can create an infinite loop.

Key Differences:

for is preferred for fixed iterations; while is better for conditions.

for loops are more readable for sequence-based operations.

while loops require manual control of the loop variable.

Common Uses:

for: Iterating over arrays, files, strings.

while: Waiting for a condition like user int or a flag.

Both loops can use break, continue, and else clauses.

In summary, use for when looping through known items or ranges, and while when the loop depends on a condition being met.

Learn More   Python Conditional Statements Explained

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