Allen Balif

Loops in Python

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Allen Balif
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2 min read

Introduction to Loops:

Loops in programming are used to execute a block of code repeatedly until a certain condition is met. In Python, there are two main types of loops: for loops and while loops.

1. for Loops:

A for loop is used to iterate over a sequence (such as a list, tuple, dictionary, or string) and execute a block of code for each item in the sequence.

Syntax:

for item in sequence:
    # code block to be executed

Example:

fruits = ["apple", "banana", "cherry"]
for fruit in fruits:
    print(fruit)

Output:

apple
banana
cherry

2. while Loops:

A while loop is used to repeatedly execute a block of code as long as a condition is true.

Syntax:

while condition:
    # code block to be executed

Example:

count = 0
while count < 5:
    print(count)
    count += 1

Output:

0
1
2
3
4

Loop Control Statements:

Python provides loop control statements to alter the flow of loops.

1. break Statement:

The break statement is used to exit the loop prematurely, regardless of whether the loop condition has been fulfilled or not.

Example:

for num in range(10):
    if num == 5:
        break
    print(num)

Output:

0
1
2
3
4

2. continue Statement:

The continue statement is used to skip the rest of the code inside the loop for the current iteration and proceed to the next iteration.

Example:

for num in range(10):
    if num == 5:
        continue
    print(num)

Output:

0
1
2
3
4
6
7
8
9

3. else Clause:

Python allows an optional else block in loops, which is executed if the loop completes normally (i.e., without encountering a break statement).

Example:

for num in range(5):
    print(num)
else:
    print("Loop completed normally.")

Output:

0
1
2
3
4
Loop completed normally.

Conclusion:

Loops are powerful constructs in Python that allow you to execute code repeatedly. Whether you need to iterate over a sequence or perform an action until a certain condition is met, loops are essential tools in your programming arsenal. Practice using loops in your code to become proficient in their usage!

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