Loops

Loops let you repeat a block of code multiple times without writing it out again and again. This is essential in data science, where you'll frequently need to process every row of a dataset or repeat a calculation until a condition is met.

The for Loop

A for loop iterates over a sequence, such as a list, string, or range of numbers.

scores = [72, 85, 90, 66]

for score in scores:
    print(score)

The while Loop

A while loop continues to run as long as its condition remains true.

count = 0

while count < 5:
    print(count)
    count += 1

Coming Up

With loops covered, the final topic in this section looks at command line arguments, which let you pass input into a Python script directly from the terminal.