Python for loop
Let me first show you how a basic for loop in Python looks:
for x in y:
# Do something
Based on this example, you can already see it translates to:
For each element X inside of statement Y, Evaluate a code block.
Let’s say we have a list with animals and would like to print each animal.
animals = ["cat", "dog", "penguin", "tiger"]
for animal in animals:
print(animal)
This will result in:
cat
dog
penguin
tiger
We can also use the range to loop x amount of times. Let’s say we want to make a loop go four times.
for item in range(4):
print("Happy Birthday")
Wil print out:
Happy Birthday
Happy Birthday
Happy Birthday
Happy Birthday
Python while loop
Besides the for loop, there is also the option to loop while a certain condition is met.
The basics for a while loop are like this:
while x == True:
# Do something
With that, we say while X is true, you must keep executing this code block.
If we actually used the code above, we would, however, build an infinite loop.
So let’s make a basic while loop and break it after the first run, so it only executes once
foo = True
while foo == True:
print("Foo is true")
foo = False
print("Foo is false now!")
And this code block will return the following:
Foo is true
Foo is false now!
You’ve seen the range option, but we could also use a while loop for that.
number = 2
while number < 5:
print("Still smaller")
number = number + 1
This gives us:
Still smaller
Still smaller
Still smaller
And there, you have the basics of two versions to loop code blocks in Python.
from Blogger http://damianfallon.blogspot.com/2021/05/python-loops-explained.html
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