10 Essential Python Snippets for Everyday Programming Tasks

## Essential Python Snippets

Python's simple syntax and powerful standard library allow developers to accomplish complex tasks with minimal code. Here are ten essential code snippets that solve common programming problems.

### 1. Read a File Safely Using contextlib
Using `with open` ensures that file descriptors are freed correctly, preventing resource leaks.
```python
with open('data.txt', 'r', encoding='utf-8') as f:
    content = f.read()
```

### 2. Deep Flatten a Nested List
Transform arbitrary nested lists using a simple recursive generator.
```python
def flatten(lst):
    for item in lst:
        if isinstance(item, list):
            yield from flatten(item)
        else:
            yield item
```

### 3. Measure Execution Time
A neat custom decorator to profile performance of any utility block.
```python
import time

def timer(func):
    def wrapper(*args, **kwargs):
        start = time.perf_counter()
        result = func(*args, **kwargs)
        print(f'{func.__name__} took {time.perf_counter() - start:.6f}s')
        return result
    return wrapper
```
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