How do you declare and assign variables in Python?

Declaring and Assigning Variables

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Declaring Variables in Python

In Python, variables are used to store data. You can declare a variable by following these rules:

1. Naming Variables:

   • Variable names must begin with a letter or an underscore.
   • Subsequent characters can be letters, digits, or underscores.
   • Variable names are case-sensitive, which means "myVar" and "myvar" are different.

2. Assigning Values:

   • You can assign a value to a variable using the "=" operator.
   • For example: my_var = 42

3. Data Types:

   • Python is dynamically typed, meaning you don't need to declare the data type explicitly.
   • The data type of a variable is determined automatically based on the assigned value.

Assigning Variables in Python

After declaring a variable, you can assign a value to it in several ways:

1. Direct Assignment:

   • As shown earlier, you can assign a value directly using the "=" operator.

2. Multiple Assignments:

   • Python allows you to assign values to multiple variables in a single line.
   • For example: x, y, z = 10, 20, 30

3. Chained Assignments:

   • You can assign the same value to multiple variables in a single line.
   • For example: a = b = c = 42

4. Updating Variables:

   • You can update the value of a variable by reassigning it.
   • For example: counter = 0 and later counter = counter + 1

5. Swapping Variables:

   • Python allows you to swap the values of two variables without using a temporary variable.
   • For example: a, b = b, a

6. Constants:

   • While Python doesn't have constants in the traditional sense, it's a common convention to use uppercase variable names for constants.

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