Square Numbers¶

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In this chapter you will:¶

area	topic
🚀	calculate square numbers
⚙	use `for` loops
⚙	indent instructions
💡	use the `range()` function
💡	use the `time` module
🐞	recognize bugs at runtime

Exercise 1: Pat your own shoulder¶

Execute the following program. What happens?

import time

for i in range(5):
    print("You are great at programming!")
    time.sleep(5)

Exercise 2: Counting¶

Execute the following two lines:

for number in range(1, 7):
    print(number)

Make the code print the numbers from 1 to 20.

Exercise 3: Prints¶

Explain why the for-loop is better than this code sniplet:

print(1)
print(2)
print(3)
print(4)
print(5)
print(6)
print(7)

Exercise 4: Indentation¶

Explain the difference between the following two programs:

x = 1
for i in range(10):
    x = x * 2
    print(x)

and

x = 1
for i in range(10):
    x = x * 2
print(x)

Exercise 5: Squares¶

Implement a for loop that produces the following output:

Exercise 6: More loops¶

Execute the following loops one by one.

for char in "ABCD":
    print(char)

for i in range(10):
    print(i)

for number in [4, 9, 16, 25]:
    print(number)

for x, y in [(1,2), (3,4), (5,6)]:
    print(x, y)

rabbits = 10
for i in range(9):
     rabbits = rabbits + rabbits // 5
     print(rabbits)