References

1. Python 3.14.6 documentation

• Built-in Functions (T012 [1])
  • round(number, ndigits=None) (T012 [3])
• Built-in Types (T001 [1])

• 3. An Informal Introduction to Python
  
  • 3.1. Using Python as a Calculator
    • 3.1.1. Numbers (T003-T006 [1], T007-T008 [3])
    • 3.1.2. Text (T002 [4])
• 6. Modules (T015 [1])
• 9. Classes (T013 [1])
  
  • 9.2. Python Scopes and Namespaces (T014 [1])

• 2: Lexical Analysis
  
  • 2.1. Line structure
    • 2.1.1. Logical Lines
    • 2.1.2. Physical Lines
    • 2.1.3. Comments (T009-T011 [3])
    • 2.1.5. Explicit Line Joining (T009-T011 [1])
    • 2.1.6. Implicit Line Joining (T009-T011 [2])
    • 2.1.8. Indentation (T009-T011 [4])
  • 2.3. Names (Identifiers and Keywords) (T007-T008 [2])
  • 2.4. Literals (T002 [1])
  • 2.5. String and Bytes Literals (T002 [2])
  • 2.6. Numeric Literals (T002 [3])
  • 2.7. Operators and Delimiters (T003-T006 [2])
• 5: The import system
  
  • 5.2. Packages (T015 [2])
  • 5.7. Package Relative Imports (T015 [4])
• 6: Expressions
  
  • 6.17. Operator precedence (T003-T006 [3])
• 7: Simple Statements
  
  • 7.1. Expression statements
  • 7.2. Assignment statements (T007-T008 [4])
  • 7.6. The return statement
  • 7.9. The break statement
  • 7.10. The continus statement
  • 7.11. The import statement (T015 [3])
  • 7.12. The global statement
  • 7.13. The nonlocal statement
• 8: Compound Statements
  
  • 8.1. The if statement
  • 8.2. The while statement
  • 8.3. The for statement
  • 8.7. Function definitions(T012 [2])
  • 8.8. Class definitions

2. Real Python

• Variables in Python: Usage and Best Practices (T007-T008 [1])

3. W3 Schools (Python Tutorial)

• Python Variables - Assign Multiple Values (T007-T008 [1])
• Python Indentation (T009-T011 [5])

4. Tutorials Point (Python Tutorial)

• Python - Functions (T012 [4])