🐍 Python from scratch · Session 3

Talking to the user: input() and types: practice sheet

Name ____________________Date __________Score ____ / 24

← Back to the lesson

Part 1: Asking a question

Remember: input("question") shows the question, waits for an answer and gives it back. Store it in a variable.

1. Warm-up Ask for a name and print Welcome, <name>!
2. Core Ask for a colour, then an animal. Print: Your <colour> <animal> is ready.
3. Stretch 🔥 Ask for three words, then print them in reverse order on one line, separated by spaces.

Part 2: input() always gives text

Remember: input() gives back a string even if digits are typed. "11" + "5" is "115".

4. Warm-up Read two numbers and print their sum as the last line.
5. Core Read a whole number n. Print n joined with itself as text, then n doubled as a number, on the last two lines (for 5: 55 then 10).
6. Stretch 🔥 Read the side of a square. Print Area: … and Perimeter: … as the last two lines.

Part 3: Convert straight away

Remember: Convert as you read: age = int(input("Age? ")). Use int for whole numbers and float for anything with a decimal point.

7. Warm-up Read an age and print: Next year you will be <age + 1>.
8. Core Read a price (decimal) and a quantity (whole). Print Total: and the cost.
9. Stretch 🔥 Read a temperature in °C and print it in °F (F = C × 9 / 5 + 32) as the last line, just the number.

Part 4: Calculators that work for anyone

Remember: Put it together: read, convert, calculate, print. The program has no numbers of its own any more: it works for whatever is typed.

10. Warm-up Read two whole numbers and print their product as the last line.
11. Core Read a bill and the number of people. Print Each pays: and the share.
12. Stretch 🔥 Read a number of seconds and print it as minutes and seconds, like 2 min 10 sec, as the last line.

Activity 1: Age in the year 2040

13. Ask for a name and a birth year. The last two lines must be: Hi <name>! and In 2040 you will be <age>.
1. Read the name.
2. Read the birth year and convert it with int().
3. Work out age = 2040 - year.
4. Print the two lines with f-strings.
```
name = input("Your name? ")
year = input("Year you were born? ")

# Step 2: convert year

# Step 3: work out the age

# Step 4: print two lines
```

Activity 2: Pizza party planner

14. Read the number of guests and how many slices each eats. A pizza has 8 slices. The last three lines must be: Slices: …, Pizzas: … (enough pizzas, rounded up) and Spare slices: ….
1. Read guests and slices each, as whole numbers.
2. slices = guests × slices each.
3. pizzas = (slices + 7) // 8 rounds up to whole pizzas.
4. spare = pizzas × 8 - slices.
5. Print the three lines.
```
guests = int(input("Guests? "))
each = int(input("Slices each? "))

# Step 2

# Step 3

# Step 4

# Step 5
```

Activity 3: Story machine

15. Read a name, an animal, a place and a food. Print a story of at least three lines. The first story line must be exactly: Once upon a time, <name> the <animal> lived on <place>.
1. Read the four words.
2. Print the first line exactly as shown, with an f-string.
3. Add at least two more lines that use the place and the food.
4. Run it with silly words and read it aloud!
```
name = input("A name? ")
animal = input("An animal? ")
place = input("A place? ")
food = input("A food? ")

# Step 2: the first line

# Step 3: two more lines
```

Predict the output

Work it out on paper first, then type it into the lesson page to check.

16. What does this print?
```
print("7" + "3")
```
17. What does this print?
```
print(int("7") + 3)
```
18. What does this print?
```
print(str(5) + "5")
```
19. What does this print?
```
print(float("2.5") * 2)
```
20. What does this print?
```
print(int(3.9))
```
21. What does this print?
```
print("3" * 3)
```

Homework

22. Warm-up Read a number and print its square as the last line.
23. Core Read the length and width of a room (decimals allowed) and print the area as the last line.
24. Stretch 🔥 Read the marks of three tests. Print the total and then the average, as the last two lines.

Answer key

name = input("Name? ")
print(f"Welcome, {name}!")

c = input("Colour? ")
a = input("Animal? ")
print(f"Your {c} {a} is ready.")

a = input("1? ")
b = input("2? ")
c = input("3? ")
print(c, b, a)

a = int(input("a? "))
b = int(input("b? "))
print(a + b)

n = input("n? ")
print(n + n)
print(int(n) * 2)

s = int(input("Side? "))
print(f"Area: {s * s}")
print(f"Perimeter: {4 * s}")

age = int(input("Age? "))
print(f"Next year you will be {age + 1}.")

p = float(input("Price? "))
q = int(input("Qty? "))
print(f"Total: {p * q}")

c = float(input("C? "))
print(c * 9 / 5 + 32)

a = int(input())
b = int(input())
print(a * b)

bill = float(input("Bill? "))
n = int(input("People? "))
print(f"Each pays: {bill / n}")

s = int(input("Seconds? "))
print(f"{s // 60} min {s % 60} sec")

name = input("Your name? ")
year = int(input("Year you were born? "))
age = 2040 - year
print(f"Hi {name}!")
print(f"In 2040 you will be {age}.")

guests = int(input("Guests? "))
each = int(input("Slices each? "))
slices = guests * each
pizzas = (slices + 7) // 8
spare = pizzas * 8 - slices
print(f"Slices: {slices}")
print(f"Pizzas: {pizzas}")
print(f"Spare slices: {spare}")

name = input("A name? ")
animal = input("An animal? ")
place = input("A place? ")
food = input("A food? ")
print(f"Once upon a time, {name} the {animal} lived on {place}.")
print(f"Every day {name} ate {food} for breakfast.")
print(f"One day the {food} ran out on {place}...")

73
10
55
5.0
3
333
```
n = int(input("Number? "))
print(n * n)
```

l = float(input("Length? "))
w = float(input("Width? "))
print(l * w)

a = int(input())
b = int(input())
c = int(input())
print(a + b + c)
print((a + b + c) / 3)