Python for loop is an essential tool that helps you do things repeatedly with items in a list, one item at a time. Think of it like going through a checklist. This article will show you how to use the “for loop” with simple examples and clear explanations.<\/p>\n
Imagine you have a list of things, like fruits, in a basket. You can use a “for loop”<\/strong> to pick up each fruit, one by one, and do something with it, like eat it or count it. This loop makes it easy to work with lots of items without doing the same thing over and over again manually.<\/p>\n For items in sequence:<\/p>\n # Code to be executed for each item<\/p>\n item:<\/strong> Represents the current item in the sequence during each iteration.<\/p>\n sequence:<\/strong> The collection of elements to be iterated over.<\/p>\n Let’s begin by iterating through a list of strings and printing each string’s length.<\/p>\n Output:<\/strong> The range() function generates a sequence of numbers that can be used with the for loop.<\/p>\n Output:<\/strong> To create more intricate patterns, you can specify a step value for the range() function.<\/p>\n Output:<\/strong> Strings can be treated as sequences, allowing you to iterate through them in reverse.<\/p>\n Output:<\/strong> To access the index and list element, you can use the enumerate() function.<\/p>\n Output:<\/strong>Before we dive into examples, let’s refresh our memory on the basic syntax of the for loop<\/h3>\n
Example 1: Iterating through a List of Strings<\/h2>\n
fruits = [\"apple\", \"banana\", \"cherry\", \"date\", \"elderberry\"]\r\n\r\nfor fruit in fruits:\r\n\r\nprint(f\"The length of {fruit} is {len(fruit)} characters.\")<\/code><\/pre>\n
\nThe length of apple is 5 characters.
\nThe length of banana is 6 characters.
\nThe length of cherry is 6 characters.
\nThe length of date is 4 characters.
\nThe length of elderberry is 10 characters.<\/p>\nExample 2: Using range() for Numeric Iteration:<\/h2>\n
for i in range(1, 6):\r\n\r\nprint(i)<\/code><\/pre>\n
\n1
\n2
\n3
\n4
\n5<\/p>\nExample 3: Iterating with Step in range()<\/h2>\n
for i in range(0, 10, 2):\r\n\r\nprint(i)<\/code><\/pre>\n
\n0
\n2
\n4
\n6
\n8<\/p>\nExample 4: Iterating Through a String Backwards<\/h2>\n
word = \"Python\"\r\n\r\nfor char in reversed(word):\r\n\r\nprint(char)<\/code><\/pre>\n
\nn
\no
\nh
\nt
\ny
\np<\/p>\nExample 5: Iterating Through a List with Index<\/h2>\n
colors = [\"red\", \"green\", \"blue\"]\r\n\r\nfor index, color in enumerate(colors):\r\n\r\nprint(f\"Color {index + 1}: {color}\")<\/code><\/pre>\n
\nColor 1: red
\nColor 2: green
\nColor 3: blue<\/p>\n