print() function basics in Python - Mini Project: Build & Apply

print() function basics

📖 Scenario: You are learning how to show messages on the screen using Python. This is like writing a note on a board for others to see.

🎯 Goal: Learn how to use the print() function to display text and numbers.

📋 What You'll Learn

Create a variable with a message

Create a number variable

Use print() to show the message

Use print() to show the number

Use print() to show both message and number together

💡 Why This Matters

🌍 Real World

Showing messages and information on the screen is the first step in making programs that communicate with users.

💼 Career

Understanding how to display output is essential for debugging and creating user-friendly applications.

1

Create a message variable

Create a variable called message and set it to the text "Hello, world!".

Python

# Create a variable called message and set it to "Hello, world!"
# Your code here

Hint

Use quotes around the text to make it a string.

2

Create a number variable

Create a variable called number and set it to the number 42.

Python

message = "Hello, world!"
# Create a variable called number and set it to 42
# Your code here

Hint

Just write the number without quotes.

3

Print the message and number separately

Use print() to show the message variable on one line, and then use print() to show the number variable on the next line.

Python

message = "Hello, world!"
number = 42
# Print the message variable
# Your code here
# Print the number variable
# Your code here

Hint

Use two separate print statements, one for each variable.

4

Print message and number together

Use one print() statement to show both message and number together separated by a space.

Python

message = "Hello, world!"
number = 42
print(message)
print(number)
# Print message and number together in one print statement
# Your code here

Hint

Use a single print with both variables separated by a comma.

Practice

1. What does the print() function do in Python?

easy

A. It displays messages or values on the screen.

B. It saves data to a file.

C. It reads input from the user.

D. It creates a new variable.

Solution

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

   The print() function is used to show messages or values on the screen, making it easy to see output from the program.

2. Step 2: Compare with other options

   Saving data, reading input, or creating variables are done by other functions, not print().

3. Final Answer:

   It displays messages or values on the screen. -> Option A

4. Quick Check:

   print() shows output [OK]

Hint: Remember: print() means show on screen [OK]

Common Mistakes:

• Confusing print() with input()
• Thinking print() saves data
• Assuming print() creates variables

2. Which of the following is the correct way to print the words Hello and World separated by a space?

easy

A. print('Hello' 'World')

B. print('Hello' + 'World')

C. print('Hello', 'World')

D. print('Hello'; 'World')

Solution

1. Step 1: Understand how print separates items

   Using commas in print() separates items with spaces by default, so print('Hello', 'World') prints "Hello World".

2. Step 2: Check other options

   print('Hello' 'World') joins strings without space; print('Hello' + 'World') concatenates without space; print('Hello'; 'World') uses invalid syntax.

3. Final Answer:

   print('Hello', 'World') -> Option C

4. Quick Check:

   Comma adds space in print() [OK]

Hint: Use commas to print multiple items with spaces [OK]

Common Mistakes:

• Forgetting commas between items
• Using semicolon inside print()
• Concatenating without spaces

3. What will be the output of this code?

print('A', 'B', 'C', sep='-')

medium

A. A B C

B. A-B-C

C. ABC

D. A-B C

Solution

1. Step 1: Understand the sep parameter in print()

   The sep parameter changes the separator between printed items. Here, it is set to '-'.

2. Step 2: Apply sep to the items

   Items 'A', 'B', 'C' will be joined with '-' between them, resulting in 'A-B-C'.

3. Final Answer:

   A-B-C -> Option B

4. Quick Check:

   sep='-' joins items with dash [OK]

Hint: sep changes space to your chosen separator [OK]

Common Mistakes:

• Ignoring sep and expecting spaces
• Confusing sep with end
• Missing quotes around separator

4. The code below gives an error. What is the problem?

print('Hello' end='!')

medium

A. Missing comma between arguments

B. end parameter cannot be used

C. Quotes are incorrect

D. print() cannot print strings

Solution

1. Step 1: Check syntax of print() arguments

   Arguments in print() must be separated by commas. Here, 'Hello' and end='!' are missing a comma.

2. Step 2: Understand correct usage

   Correct syntax is print('Hello', end='!') with a comma separating the string and the keyword argument.

3. Final Answer:

   Missing comma between arguments -> Option A

4. Quick Check:

   Separate print args with commas [OK]

Hint: Separate print arguments with commas [OK]

Common Mistakes:

• Forgetting commas between arguments
• Thinking end is not allowed
• Misplacing quotes

5. How can you print the numbers 1, 2, and 3 on the same line separated by commas, but end the line with a period instead of a newline?

hard

A. print(1, 2, 3, sep=',') print(end='.')

B. print(1, 2, 3, sep='.', end=',')

C. print(1, 2, 3, sep=', end='.')

D. print(1, 2, 3, sep=',', end='.')

Solution

1. Step 1: Use sep to set commas between numbers

   Setting sep=',' prints numbers separated by commas: '1,2,3'.

2. Step 2: Use end to replace newline with a period

   Setting end='.' prints a period instead of moving to a new line.

3. Step 3: Check argument order

   Argument order does not matter, but both sep and end must be included in the same print call.

4. Final Answer:

   print(1, 2, 3, sep=',', end='.') -> Option D

5. Quick Check:

   sep=',' and end='.' print 1,2,3. [OK]

Hint: Use sep for commas and end for period [OK]

Common Mistakes:

• Swapping sep and end values
• Using two print statements instead of one
• Forgetting to set end to '.'