for-loops

A for loop is used to iterate over a given sequence like a list, string, or repeat a specific block of code a known number of times.

Example - Iterating over a list

Code

students = ['mary', 'jerry', 'larry']

# prints names in list
for student in students:
    print(student)    

Output

mary
jerry
larry

We can quickly print the items in our list instead of having 3 separate print statements!

range()

Remember how it was mentioned that for loops can be used to repeat a block of code a certain number of times? In python there is a neat function called range() that allows us to accomplish this! For now range(x) will take in a positive whole number x and the function will return a sequence of numbers starting from 0 incrementing by 1 until we reach x - 1

Example - using range()

Code

for x in range(3):
    print(x)    

Output

0
1
2