{"id":540,"date":"2024-11-20T03:47:26","date_gmt":"2024-11-20T03:47:26","guid":{"rendered":"https:\/\/techkubo.com\/python\/?p=540"},"modified":"2025-06-21T16:58:27","modified_gmt":"2025-06-21T16:58:27","slug":"python-for-loops","status":"publish","type":"post","link":"https:\/\/techkubo.com\/python\/python-for-loops\/","title":{"rendered":"Python For Loops"},"content":{"rendered":"\n

A for<\/code> loop allows you to iterate over a sequence of elements, such as a list, tuple, string, or range. It is useful for performing repetitive tasks on each item in a sequence.<\/p>\n\n\n\n

Basic For Loop<\/h2>\n\n\n\n

The basic syntax of a for<\/code> loop is as follows:<\/p>\n\n\n\n

The for<\/code> loop iterates over each item in the sequence, executing the indented block of code for each item.<\/p>\n\n\n\n

for item in sequence:\n    # Code to be executed<\/pre><\/div>\n\n\n\n
<\/p>\n\n\n\n
In this example, the loop prints each fruit in the fruits<\/code> list.<\/p>\n\n\n\n
fruits = ["apple", "banana", "cherry"]\nfor fruit in fruits:\n    print(fruit)<\/pre><\/div>\n\n\n\n
<\/p>\n\n\n\n
Looping Through a String<\/h2>\n\n\n\n
You can use a for<\/code> loop to iterate over each character in a string. The loop iterates over each character in the string and executes the code block for each character.<\/p>\n\n\n\n
text = "Hello"\nfor char in text:\n    print(char)<\/pre><\/div>\n\n\n\n
<\/p>\n\n\n\n
Looping Through a Range<\/h2>\n\n\n\n
The range()<\/code> function creates a sequence of numbers from 0 up to (but not including) the specified end value, which can be used to control the number of times a loop executes. In this example, the loop prints numbers from 0 to 4.<\/p>\n\n\n\n
for i in range(5):\n    print(i)<\/pre><\/div>\n\n\n\n
<\/p>\n\n\n\n
Looping with an Else Clause<\/h2>\n\n\n\n
You can include an else<\/code> clause with a for<\/code> loop. The else<\/code> block will be executed after the loop finishes iterating over all items in the sequence. The else<\/code> block runs after the loop completes normally.<\/p>\n\n\n\n
for i in range(5):\n    print(i)\nelse:\n    print("Loop is finished")<\/pre><\/div>\n\n\n\n
<\/p>\n\n\n\n
Breaking out of a For Loop<\/h2>\n\n\n\n
You can use the break<\/code> statement to exit a for<\/code> loop prematurely, even if there are more items to iterate over.<\/p>\n\n\n\n
In this example, the loop prints numbers from 0 to 4 and then exits when i<\/code> is equal to 5. The break<\/code> statement immediately terminates the loop.<\/p>\n\n\n\n
for i in range(10):\n    if i == 5:\n        break\n    print(i)<\/pre><\/div>\n\n\n\n
<\/p>\n\n\n\n
Skipping Iterations in a For Loop<\/h2>\n\n\n\n
The continue<\/code> statement skips the current iteration and moves to the next iteration of the loop.<\/p>\n\n\n\n
 In this example, the loop prints only odd numbers from 0 to 9. The continue<\/code> statement allows you to skip specific iterations based on a condition.<\/p>\n\n\n\n
for i in range(10):\n    if i % 2 == 0:\n        continue\n    print(i)<\/pre><\/div>\n\n\n\n
<\/p>\n\n\n\n
Nested For Loops<\/h2>\n\n\n\n
You can nest for<\/code> loops within each other to iterate over multi-dimensional data structures.<\/p>\n\n\n\n
This example prints each item in a 2D list (matrix) in a structured format. Nested for<\/code> loops allow you to iterate over each item in a multi-dimensional sequence.<\/p>\n\n\n\n
matrix = [\n    [1, 2, 3],\n    [4, 5, 6],\n    [7, 8, 9]\n]\n\nfor row in matrix:\n    for item in row:\n        print(item, end=" ")\n    print()<\/pre><\/div>\n\n\n\n
<\/p>\n\n\n\n
Python For Loops Example Code<\/strong><\/h2>\n\n\n\n
This program uses for<\/code> loops to iterate over lists, strings, ranges, and demonstrates breaking out of loops, skipping iterations, and nesting loops.<\/p>\n\n\n\n
# Basic for loop\nfruits = ["apple", "banana", "cherry"]\nfor fruit in fruits:\n    print(fruit)\n\n# Looping through a string\ntext = "Hello"\nfor char in text:\n    print(char)\n\n# Looping through a range\nfor i in range(5):\n    print(i)\n\n# Looping with an else clause\nfor i in range(5):\n    print(i)\nelse:\n    print("Loop is finished")\n\n# Breaking out of a for loop\nfor i in range(10):\n    if i == 5:\n        break\n    print(i)\n\n# Skipping iterations in a for loop\nfor i in range(10):\n    if i % 2 == 0:\n        continue\n    print(i)\n\n# Nested for loops\nmatrix = [\n    [1, 2, 3],\n    [4, 5, 6],\n    [7, 8, 9]\n]\n\nfor row in matrix:\n    for item in row:\n        print(item, end=" ")\n    print()<\/pre><\/div>\n\n\n\n
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Python Labs<\/strong><\/h2>\n\n\n\n