Python 3 While Loop tutorial



The two distinctive loops we have in Python 3 logic are the "for loop" and the "while loop." Both of them achieve very similar results, and can almost always be used interchangeably towards a goal. Many times it comes down to programmer preference, or is reliant on efficiency. Generally, the for loop can be more efficient than the while loop, but not always.

The idea of the While loop is:

While something is the case, do the following block of code.

Here is an example of a while loop:

condition = 1

while condition < 10:
	print(condition)
	condition += 1

In this code, we have defined a variable name condition, and condition starts at a value of 1.

Next, we specify the terms of the while statement, which are : While the condition variable is less than 10, we will print the condition variable out. After printing out the condition, we will add 1 to the current condition.

This process will continue until condition equals 10.

There is usually more complex code within the while loop. If you are not familiar with what a code block is, in the case of the while loop above, the "code block" within the while loop is:

	print(condition)
	condition += 1

This setup of a while loop is known as creating a "counter," since basically that is what we're doing. We're saying we just want to count 1 for every iteration and eventually stop at our limit. While loops are usually finite and defined in this sense, but while loops can also be undefined. Something like:

Assuming we had something built to detect weather:

while isRaining:
	print(condition)

In this case, this loop would continue running while it was raining outside. When the rain stopped, the loop would cease.

Another example is what is known as the infinite loop. This is easiest done with the help of a while loop.

while True:
	print('doing stuff!!')

If you actually run the above code, you can stop it by doing ctrl+c to break it. The above is an intentional infinite loop.


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