Python Keywords

Introduction

• Keywords in Python are reserved words with special meanings and purposes in the language syntax.
• They cannot be used as names for variables, functions, and classes or any identifiers.

List of Keywords

• Some of the keywords include: True, False, None, and, or, not, is, if, else, elif, for, while, break, continue, pass, try, except, finally, raise, assert, def, return, lambda, yield, class, import, from, in, as, del, global, with, nonlocal, async, await.

Getting List of All Python Keywords

• Python provides a way to get all keywords using the keyword module.

  import keyword
  print(keyword.kwlist)
  

Methods to Identify Python Keywords

• Syntax Highlighting: IDEs provide this feature to display keywords in different colors or styles.
• Look for SyntaxError: Using a keyword incorrectly results in a SyntaxError.

Categorization of Keywords

Value Keywords

• Keywords: True, False, None
• True & False: Represent boolean values.
• None: Represents a null value or void. Python considers None as NoneType.

Operator Keywords

• Keywords: and, or, not, in, is
• and: Returns True if both operands are True.
• or: Returns True if at least one operand is True.
• not: Inverts the truth value.
• in: Checks membership in sequences.
• is: Checks if two variables point to the same object in memory.

Control Flow Keywords

• Keywords: if, else, elif, for, while, break, continue, pass
• if/else/elif: Conditional execution.
• for/while: Looping constructs.
• break: Exits the loop.
• continue: Skips current iteration.
• pass: Null statement for placeholders.

Exception Handling Keywords

• Keywords: try, except, finally, raise, assert
• try/except: Catches exceptions.
• finally: Always executed after try-except.
• raise: Explicitly raises an exception.
• assert: Debugging tool to test conditions.

Structure Keywords

• Keywords: def, class, return, lambda, yield
• def: Function definition.
• class: Class declaration.
• return: Exits a function and returns a value.
• yield: Similar to return but for generators.
• lambda: Defines anonymous functions.

Context Management

• Keywords: with, as
• with: Context management for resource handling.
• as: Aliasing during imports.

Import and Module Keywords

• Keywords: import, from
• import: Import modules.
• from: Import specific parts of a module.

Scope and Namespace Keywords

• Keywords: global, nonlocal
• global: Declares a global variable.
• nonlocal: Refers to a variable in the outer enclosing function.

Async Programming Keywords

• Keywords: async, await
• async: Declares asynchronous functions.
• await: Pauses execution until a task completes.

Additional Resources

• Suggested Quiz: Contains questions on Python keywords.
• Related Topics & Tutorials: Python data types, exception handling, and OOP concepts.

Conclusion

Python's keywords are foundational to its syntax and structure, enabling effective programming through control flow, data manipulation, and more.