For Loops

Learning to Use ‘For Loops’ in Python

If you are new to programming or Python, you may be familiar with the term ‘for loops.’ In Python, a ‘for loop’ is a type of loop used to iterate or repeat a piece of code for a given number of times. ‘For loops’ are a powerful tool used by programmers to execute code repeatedly, and they can help you optimize your programming workflows by automating repetitive tasks.

Syntax of a For Loop

The syntax of a ‘for loop’ looks like this:

for variable_name in iterable_object:
    # do something

The iterable_object is usually a list or a sequence of some sort. You can think of a list as a collection of values that are stored in a specific order. You’ll typically use this type of loop when you want to perform the same operation on each item in an iterable object, such as a list or tuple.

Here is an example of how to use ‘for loops’ to output a list of numbers from 1 to 10:

for i in range(1, 11):

In this example, range(1,11) is an iterable object that contains each number from 1 to 10, and the ‘for loop’ iterates through each value and prints it to the console using the print() function.

Using a For Loop with a List

In Python, we can use ‘for loops’ with lists to perform different operations on each item in the list. Here is an example that demonstrates how to use a ‘for loop’ with a list:

colors = ['red', 'green', 'blue', 'yellow']

for color in colors:

In this example, we have created a list called ‘colors’ that contains strings representing different colors. We then use the ‘for loop’ to iterate over each item in the list and print it to the console using the print() function.

Using Range with For Loops

In Python, the range() function is used to generate a sequence of numbers, which can be used with ‘for loops.’ The syntax of the range() function looks like this:

range(start, stop, step)

The parameters for the range() function are:

– start: The starting value of the sequence. If not specified, the sequence starts from 0.
– stop: The ending value of the sequence. This value is not included in the sequence.
– step: The increment between each value in the sequence. If not specified, the default value is 1.

Here is an example of how to use the range() function with a ‘for loop’:

for i in range(0, 10, 2):

In this example, we are using the range() function to create a sequence of even numbers from 0 to 10. The ‘for loop’ iterates over each value in the sequence and prints it to the console using the print() function.

Using For Loops with Dictionaries

In Python, a dictionary is a collection of key-value pairs, where each key is associated with a value. You can use ‘for loops’ with dictionaries to access the keys and values within the dictionary. Here is an example:

cars = {'make': 'Toyota', 'model': 'Corolla', 'year': '2020'}

for key, value in cars.items():
    print(key + ': ' + value)

In this example, we have a dictionary called ‘cars’ that contains information about a specific car. We use the .items() method of the dictionary to iterate over each key-value pair and print it to the console using the print() function.


‘For loops’ are an essential tool that every Python programmer should know. They allow you to automate repetitive tasks and iterate over different types of objects with ease. As you continue to learn Python, you will find many opportunities to use ‘for loops’ in your code. Keep practicing and learning the ins and outs of this powerful tool.

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