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int and float

Learn int and float types and conversions.

int and float

In Python numbers come in two basic types: int (integer) and float (decimal).

age = 25          # int
price = 19.99     # float

int holds whole numbers; Python has no integer limit (as long as memory allows). float is for decimal numbers.

When you mix the two, the result is usually a float: 5 + 2.0 gives 7.0. This is called automatic type conversion.

Large numbers and underscores

Python accepts underscores in large numbers to make them easier to read:

population = 7_900_000_000
budget = 1_250_000.50

The underscores are ignored by Python; the number has the same value. This works like a thousands separator and improves readability.

Scientific notation is also supported: 1e6 means one million (float).

Practice Print int and float

Assign 100 (int) to count, assign 2.5 (float) to weight. Then print print(count, weight).

Starter code

main.py
# Define the numbers

Sample solution

main.py
count = 100
weight = 2.5
print(count, weight)

Expected output

100 2.5

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 What is the result of 5 + 2.0?

  • 7
  • 7.0 Correct answer
  • 5.0
  • It raises an error

Explanation: int + float = float, the result is 7.0.

2 Assign a decimal price

Question 
price = ____
print(price)
Answer 
price = 19.99
print(price)

Explanation: price = 19.99 assigns a float value.

3 Which of these is a float?

  • 5
  • '5.0'
  • 5.0 Correct answer
  • "5"

Explanation: 5.0 is a decimal number, a float.

All lessons in Beginner

1 Python basics

  1. What is Python?
  2. REPL and print
  3. Comments
  4. Indentation blocks
  5. python -c and scripts
  6. Summary - Python basics

2 Variables

  1. Variable assignment
  2. Multiple assignment
  3. Naming variables
  4. id and type
  5. Swapping variables
  6. Summary - Variables

3 Data types

  1. int and float
  2. bool
  3. str basics
  4. None
  5. Type conversion
  6. Summary - Data types

4 Project: Calculator

  1. Project design
  2. Add/subtract
  3. Multiply/divide
  4. Error handling
  5. Putting it together

5 Operators

  1. Arithmetic
  2. Comparison
  3. Logical
  4. Bitwise
  5. Membership and identity
  6. Summary - Operators

6 String basics

  1. f-string
  2. Concatenation
  3. str.format
  4. Raw strings
  5. Triple-quote
  6. Summary - String basics

7 Conditionals

  1. The if statement
  2. elif and else
  3. Nested if
  4. Truthiness
  5. Conditional expression
  6. Summary - Conditionals

8 Loops

  1. The for loop
  2. range
  3. The while loop
  4. break and continue
  5. Loop else
  6. Summary - Loops

9 Project: Shopping cart

  1. Cart design
  2. Adding items
  3. Calculating totals
  4. Updating quantity
  5. Putting it together

10 Lists

  1. Declaring lists
  2. Index and slice
  3. List methods
  4. in and count
  5. Sorting lists
  6. Summary - Lists

11 List comprehension

  1. Comprehension basics
  2. Filtered comprehension
  3. Dict and set comprehension
  4. Nested comprehension
  5. Generator expression
  6. Summary - List comprehension

12 Tuple, set and dict

  1. Tuple
  2. Set
  3. Dict basics
  4. Dict methods
  5. Dict comprehension
  6. Summary - Tuple, set and dict

13 Functions

  1. def
  2. return
  3. Docstring
  4. Default parameters
  5. *args and **kwargs
  6. Summary - Functions

14 Function parameters

  1. Positional parameters
  2. Keyword parameters
  3. Keyword-only
  4. Positional-only
  5. Type hints basics
  6. Summary - Function parameters

15 Project: To-do CLI

  1. Task model
  2. Adding tasks
  3. Listing tasks
  4. Completing tasks
  5. Putting it together

16 Advanced string methods

  1. split and join
  2. strip, lstrip, rstrip
  3. replace
  4. find and index
  5. startswith, endswith
  6. Summary - Advanced strings

17 Input and output

  1. input()
  2. int/float conversion
  3. print parameters
  4. f-string formatting
  5. sys.argv
  6. Summary - Input and output

18 Error handling

  1. try/except
  2. else and finally
  3. raise
  4. Exception hierarchy
  5. Custom exceptions
  6. Summary - Error handling

19 Modules

  1. import
  2. from import
  3. as alias
  4. __name__ == '__main__'
  5. Standard library
  6. Summary - Modules

20 Beginner final

  1. Project design
  2. Data model
  3. Business logic
  4. Error handling
  5. Putting it together