Python scope of variables
Sure! Here's a **simple and clear description of Python variables**:
---
🐍 *Python Variables - Explained*
A *variable* in Python is a name that refers to a value stored in memory. You use variables to store data that your program can use and manipulate.
---
📌 *Key Points:*
1. *No Declaration Needed:*
You don't need to declare the type of variable beforehand.
Example:
```python
x = 5 # integer
name = "Ali" # string
pi = 3.14 # float
```
2. *Dynamic Typing:*
The type of variable can change depending on the value assigned.
Example:
```python
x = 10 # x is an integer
x = "Hello" # now x is a string
```
3. *Variable Naming Rules:*
Must start with a letter or underscore `_`
Can contain letters, digits, and underscores
Case-sensitive (e.g., `age` and `Age` are different)
✅ Valid:
```python
user_name = "Ahmed"
_count = 10
```
❌ Invalid:
```python
1name = "Ali" # starts with a number
user-name = "Zara" # contains a hyphen
```
4. *Assigning Multiple Variables:*
```python
a, b, c = 1, 2, 3
```
5. *Global vs Local Variables:*
**Global**: declared outside functions, accessible everywhere.
**Local**: declared inside functions, only accessible inside them.
---
📘 Example:
```python
name = "Sara" # global variable
def greet():
local_msg = "Hello"
print(local_msg, name) # access global inside function
greet()
```
---
Let me know if you'd like notes in PDF, or examples with input/output!
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