Repeating instructions

In our early programs, each Python instruction was executed only once. That makes programming a bit pointless, because our programs are limited by our typing speed.

In this section we will take a closer look at the for statement that repeats one or more instructions several times.

Exercise 1

What does the following program do?

for number in range(1, 43):
    print(number)

Exercise 2

What advantages does the for loop have over the following one?

print(0)
print(1)
print(2)
print(3)
print(4)
..

Exercise 3

Write a for loop that creates the following output

1
4
9
16
25
36
49

Exercise 4

Explain the difference between the following two programs:

total = 0
for number in range(10):
    total = total + number
    print(total)

and

total = 0
for number in range(10):
    total = total + number
print(total)

Exercise 5

What does the following program do?

text = ""
characters = "Hannah"
for char in characters:
    text = char + text
print(text)

Exercise 6

Write a program that calculates the number of characters in Stefani Joanne Angelina Germanotta. Spaces count as well!