Coding Schools

In Python, declaring a variable is simple and straightforward. You just need to assign a value to a name using the = operator. Here's a basic example:

# Integer variable
age = 25

# Float variable
pi = 3.14159

# String variable
name = "Alice"

# Boolean variable
is_student = True

# List variable
fruits = ["apple", "banana", "cherry"]

# Dictionary variable
person = {"name": "Alice", "age": 25}

# Tuple variable
coordinates = (100, 200)

Key Points:

1. Dynamic Typing: Python is dynamically typed, meaning the type of a variable is determined at runtime and you don't need to declare the type of the variable explicitly.

   python

   variable = 10     # Now variable is an integer
   variable = "text" # Now variable is a string
   

2. Case Sensitivity: Variable names are case-sensitive, so age and Age would be considered different variables.

   python

   age = 25
   Age = 30
   

3. Naming Conventions: It's a good practice to use meaningful variable names and follow naming conventions such as using lowercase letters and underscores (_) for readability.

   python

   student_name = "Bob"
   student_age = 20
   

4. Reserved Keywords: Avoid using Python's reserved keywords (like def, class, if, else, etc.) as variable names.

   python

   # This would raise an error
   def = 42  
   

5. Reassignment: Variables in Python can be reassigned to different types of data. The new assignment will completely overwrite the previous value and type.

   python

   my_var = "hello"
   my_var = 42
   

Feel free to let me know if you have any specific scenarios or questions about variable declaration!