What is the difference between a module-level variable and a global variable?

Question

Accepted Answer

**Module-level variable** is defined at the top level of a module. **Global variable** is declared with `global` inside a function.

**Module-level:**
```python
# module.py
count = 0  # Module-level

def increment():
    global count
    count += 1
```

**Global in function:**
```python
def func():
    global x
    x = 10  # Creates global variable

func()
print(x)  # 10
```

**Best practice:**
- Avoid global variables.
- Use function arguments and return values.
- Use classes to group state.

Python: What is the difference between a module-level variable and a global variable?