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Python Variables


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Python Variables

Variables in Python are used to store data values. They are created when you assign a value to them, and you don't need to declare their type explicitly. Python is dynamically typed, meaning the type of a variable is inferred from the value assigned to it.

#### Creating Variables

To create a variable, simply assign a value to it using the equals sign (`=`):

```python
Creating variables
x = 5
y = "Hello"
z = 3.14
```

In this example, `x` is an integer, `y` is a string, and `z` is a float.

#### Variable Naming Rules

1. Variable names must start with a letter (a-z, A-Z) or an underscore (_).
2. The rest of the name can contain letters, numbers (0-9), or underscores.
3. Variable names are case-sensitive (`myVar`, `myvar`, and `MYVAR` are different).

#### Examples of Valid Variable Names

```python
my_variable = 10
_myVariable = "Python"
myVariable2 = 3.14
```

#### Examples of Invalid Variable Names

```python
2myvariable = 10 # Cannot start with a number
my-variable = 20 # Cannot contain hyphens
my variable = 30 # Cannot contain spaces
```

#### Assigning Multiple Values

You can assign values to multiple variables in one line:

```python
a, b, c = 1, 2, "Hello"
```

This assigns `1` to `a`, `2` to `b`, and `"Hello"` to `c`.

#### Assigning the Same Value to Multiple Variables

You can also assign the same value to multiple variables in one line:

```python
x = y = z = "Python"
```

This assigns `"Python"` to `x`, `y`, and `z`.

#### Changing the Value of a Variable

The value of a variable can be changed by reassigning it:

```python
x = 5
x = "Hello"
```

Initially, `x` is an integer with the value `5`. Then, `x` is reassigned to the string `"Hello"`.



Understanding variables and how to use them effectively is a fundamental aspect of programming in Python. They allow you to store, manipulate, and retrieve data in your programs.