Learning outcomes
You will learn to use:
The input function
The int function
String formatting
Number formatting
Activity 6.1
Input function
The input function allows the user to input a value and assign it to a variable.
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Copy and run this program.
myAnswer=input("Please enter your name: ")
print(myAnswer)
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Re-run the program several times, entering different names each time.
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Write a program that asks the user for their name and favourite food and displays these on the screen.
Activity 6.2
Int function
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Copy and run this program.
age=input("Please enter your age: ")
agePlusTen = age + 10
print("You will be",agePlusTen,"in 10 years")
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Explain why it does not work.
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Correct the program.
Activity 6.3
Write a program that asks you to enter a number then displays the number doubled.
Activity 6.4
String formatting
The string method .format gives you more control over the formatting of your output than printing using space-separated values. The string formatting commands are given in curly brackets {}.
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Copy and run these lines of code:
>>>foodOne="fish"
>>>foodTwo="chips"
>>>print("{0} and {1}".format(foodOne,foodTwo))
fish and chips
>>>print("{1} and {0}".format(foodOne,foodTwo))
chips and fish
>>>print("{1} {1} {1} and {0} {0} {0}".format(foodOne,foodTwo))
chipschipschips and fishfishfish
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Create these variables:
one = “cheese”
two =”onion”
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Use the .formatcommand to display:
My favourite crisps are cheese and onion. I love them!
cheese and onion and cheese and onion and cheese and onion
cheesecheesecheese and oniononiononion
You guessed it. The best crisps are onion and … cheese.
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Try altering the flavours assigned to the variables to your favourite flavour! Enjoy.
Activity 6.5
Formatting numbers
You can use the .format method to format the number of decimal places.
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Copy and run these lines of code:
>>>number = 98.1468297645
>>>print("The answer is {0:.5f}".format(number))
The answer is 98.14683
>>>print("The answer is {0:.4f}".format(number))
The answer is 98.1468
>>>print("The answer is {0:.3f}".format(number))
The answer is 98.147
>>>print("The answer is {0:.1f}".format(number))
The answer is 98.1
>>>print("The answer is {0:.0f}".format(number))
The answer is 98
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Assign the number 765.87641987 to a variable and display the number with 5, 2 and no decimal places using the .format command.
Activity 6.6
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Write a program that asks how much your bill is at a restaurant and then asks you to enter the % you want to give in a tip. The program should display the amount of tip to give to the waiter.
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Amend the program so that it also displays the total cost of the meal including the tip.
Activity 6.7
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Write a program that displays the square of a number.
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Write a program that prompts for a number and then displays the cube of a number.
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Write a program to find the perimeter of a square.
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Write a program to find the perimeter of a rectangle.
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Write a program that finds the area of a square.
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Write a program that finds the area of a cube.
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Write a program to convert from pounds to euros.
Hint: All these programs should prompt for the input information and display the result appropriately.
