Variables and Data Types

Variables and Data Types

1. Variables and Naming Conventions:

• What are variables and why are they used?
• Rules for naming variables (must start with a letter, no spaces, etc.).
• Choosing meaningful variable names. Variable assignment and reassignment.
• Variable assignment and reassignment.

2. Numeric Data Types:

• Integers (int): Whole numbers without decimals.
• Floating-point numbers (float): Numbers with decimal points.
• Complex numbers (complex): Numbers with real and imaginary parts.

3. Textual Data Type - Strings:

• Creating strings using single, double, or triple quotes.
• Escaping characters within strings.
• String concatenation using the + operator.
• String repetition using the * operator.
• Accessing characters in a string using indexing.
• Slicing strings to extract substrings.
• String methods (.lower(), .upper(), .strip(), .replace(), etc.).

4. Boolean Data Type:

• Boolean values (True and False).
• Boolean operators (and, or, not).
• Comparison operators (==, !=, <, >, <=, >=).

5. Type Conversion (Casting):

• Converting between different data types (e.g., int to float, float to int).
• Using built-in functions like int(), float(), str().

6. Type Inference:

• Python's ability to automatically determine variable types.
• Checking the type of a variable using the type() function.

7. None Type:

• Understanding the special value None and its purpose.
• Using None to indicate the absence of a value.

8. Mutable vs. Immutable Types:

• Explaining the difference between mutable and immutable data types.
• Lists as mutable and strings as immutable examples.

9. Type Checking and isinstance():

• Checking the type of a variable using isinstance().
• Handling different types of data differently in your code.

10. Variables and Memory Allocation:

• How variables store references to objects in memory.
• The concept of garbage collection.

11. Arithmetic Operations:

• Performing arithmetic operations on numeric types.
• Operator precedence and parentheses.

12. String Escapes and Raw Strings:

• Special characters in strings (\n, \t, etc.).
• Raw strings and their usage.

13. Unicode and Encoding:

• Brief introduction to Unicode and character encoding.
• Handling Unicode characters in strings.

14. Variables and Scope:

• Local and global variables.
• Scope rules within functions and code blocks.

15. Constants:

• Creating constants using uppercase variable names.
• Convention for indicating that a variable is a constant.