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Taking input using input() in Python - Cheat Sheet & Quick Revision

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Recall & Review
beginner
What does the input() function do in Python?
The input() function waits for the user to type something and press Enter. It then returns what the user typed as a string.
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beginner
How do you store user input in a variable?
You assign the result of input() to a variable like this: name = input(). Now name holds the text the user typed.
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beginner
How can you show a message to the user before taking input?
You can pass a string to input() like this: input('Enter your name: '). This message appears before the user types.
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beginner
What type of data does input() return?
input() always returns a string, even if the user types numbers. You need to convert it if you want another type.
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beginner
How do you convert user input to an integer?
Use the int() function like this: age = int(input('Enter your age: ')). This changes the input string to a number.
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What does input() return when the user types 123?
AError
B123 (an integer)
C"123" (a string)
DNone
How do you show a prompt message before input?
Ainput() + 'Enter your name: '
Binput('Enter your name: ')
Cprint('Enter your name: ')
Dprompt('Enter your name: ')
Which code correctly stores user input in a variable?
Aname() = input
Binput = name()
Cinput(name)
Dname = input()
How to convert input to an integer?
Aint(input())
Bstr(input())
Cfloat(input())
Dinput(int())
What happens if user types a non-number and you use int(input())?
AProgram gives an error
BInput is converted to 0
CInput is ignored
DInput is converted to string
Explain how to take user input and store it in a variable with a prompt message.
Think about how to show a message and save what user types.
You got /3 concepts.
    Describe how to convert user input to a number and why it is necessary.
    Remember input is text by default.
    You got /3 concepts.

      Practice

      (1/5)
      1. What does the input() function do in Python?
      easy
      A. It stops the program immediately.
      B. It prints text on the screen.
      C. It asks the user to type something and returns it as text.
      D. It converts text to numbers automatically.

      Solution

      1. Step 1: Understand the purpose of input()

        The input() function waits for the user to type something and press Enter.

      2. Step 2: Identify what input() returns

        It always returns the typed data as a string (text), not numbers or other types.

      3. Final Answer:

        It asks the user to type something and returns it as text. -> Option C

      4. Quick Check:

        input() returns text [OK]
      Hint: Remember: input() always returns text, never numbers directly [OK]
      Common Mistakes:
      • Thinking input() prints text
      • Assuming input() stops the program
      • Believing input() converts text to numbers automatically
      2. Which of the following is the correct way to ask the user for their name using input()?
      easy
      A. name = input Enter your name:
      B. name = input('Enter your name: ')
      C. name = input['Enter your name:']
      D. name = input{Enter your name:}

      Solution

      1. Step 1: Check the syntax of input() with prompt

        The prompt must be inside parentheses and quotes, like input('prompt').

      2. Step 2: Identify the correct option

        Only name = input('Enter your name: ') uses parentheses and quotes correctly to show the prompt.

      3. Final Answer:

        name = input('Enter your name: ') -> Option B

      4. Quick Check:

        Prompt text inside parentheses and quotes [OK]
      Hint: Use parentheses and quotes for prompt text in input() [OK]
      Common Mistakes:
      • Missing parentheses around prompt
      • Using brackets or braces instead of parentheses
      • Not putting prompt text inside quotes
      3. What will be the output of this code if the user types 25 when asked? 
      age = input('Enter your age: ')
print(age + 5)
      medium
      A. 30
      B. 255
      C. 5
      D. TypeError

      Solution

      1. Step 1: Understand input() returns a string

        The variable age will be the string '25', not the number 25.

      2. Step 2: Analyze the print statement

        age + 5 attempts to add a string and an integer. In Python, this causes a TypeError, but if the code was print(age + '5'), it would concatenate to '255'. Since the code is print(age + 5), it raises a TypeError.

      3. Final Answer:

        TypeError -> Option D

      4. Quick Check:

        String + int causes TypeError [OK]
      Hint: input() returns text; convert to int before adding numbers [OK]
      Common Mistakes:
      • Assuming input() returns number
      • Trying to add int to string without conversion
      • Expecting automatic type conversion
      4. Find the error in this code snippet: 
      number = input('Enter a number: ')
result = number * 2
print(result)
      medium
      A. number is a string, multiplying repeats text instead of doubling number
      B. input() should be replaced with print()
      C. Missing parentheses in print statement
      D. No error, code works fine

      Solution

      1. Step 1: Identify the type of number

        The input() function returns a string, so number is text.

      2. Step 2: Understand what number * 2 does for strings

        Multiplying a string by 2 repeats it twice, so if user types '3', result is '33', not 6.

      3. Final Answer:

        number is a string, multiplying repeats text instead of doubling number -> Option A

      4. Quick Check:

        String * 2 repeats text, not math multiply [OK]
      Hint: Convert input to int before math operations [OK]
      Common Mistakes:
      • Assuming input returns number
      • Expecting string * 2 to double value
      • Ignoring type conversion
      5. You want to ask the user for two numbers and print their sum. Which code correctly does this?
      hard
      A. a = int(input('First number: ')) b = int(input('Second number: ')) print(a + b)
      B. a = input('First number: ') b = input('Second number: ') print(a + b)
      C. a = input('First number: ') b = input('Second number: ') print(int(a) + b)
      D. a = input('First number: ') b = int(input('Second number: ')) print(a + b)

      Solution

      1. Step 1: Convert inputs to numbers

        To add numbers, convert both inputs from strings to integers using int().

      2. Step 2: Add the converted numbers

        Only a = int(input('First number: ')) b = int(input('Second number: ')) print(a + b) converts both inputs before adding, so it sums correctly.

      3. Final Answer:

        a = int(input('First number: ')) b = int(input('Second number: ')) print(a + b) -> Option A

      4. Quick Check:

        Convert both inputs to int before adding [OK]
      Hint: Convert all inputs to int before math [OK]
      Common Mistakes:
      • Adding strings instead of numbers
      • Converting only one input
      • Forgetting to convert inputs