Python List Index Error Handling Iteration Code Examples

This collection provides ready-to-use Python code snippets for safely handling list index out of range error handling iteration problems. Copy and customize these utilities for your projects.

Safe List Access Functions #

Basic Safe Access with Default Values #

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Output:

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Advanced Safe Access with Type Checking #

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Output:

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Iteration Safety Utilities #

Safe Range Iterator #

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Output:

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List Modification During Iteration #

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Output:

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Nested List Safety #

Safe Nested Access #

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Output:

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Error Handling Decorators #

Index Error Handler Decorator #

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Output:

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Practical Utility Functions #

Batch Processing with Error Handling #

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def process_list_safely(lst, processor_func, batch_size=None):
    """Process list elements safely with optional batching."""
    results = []
    errors = []
    
    if batch_size is None:
        batch_size = len(lst)
    
    for i in range(0, len(lst), batch_size):
        batch = lst[i:i + batch_size]  # Slicing is safe from IndexError
        
        for j, item in enumerate(batch):
            try:
                result = processor_func(item)
                results.append(result)
            except Exception as e:
                errors.append({
                    'index': i + j,
                    'item': item,
                    'error': str(e)
                })
    
    return results, errors

# Example usage
def square_number(x):
    if isinstance(x, str):
        raise ValueError("Cannot square a string")
    return x ** 2

mixed_data = [1, 2, "hello", 4, 5]
results, errors = process_list_safely(mixed_data, square_number, batch_size=2)

print(f"Results: {results}")
print(f"Errors: {errors}")

Output:

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Summary #

These Python list index error handling iteration code examples provide:

Safe access functions with default values and type checking
Iteration utilities that prevent index out of range errors
Nested list handlers for complex data structures
Decorators for automatic error handling
Batch processing utilities with comprehensive error tracking

Copy these snippets into your projects and customize them for your specific use cases. They help prevent crashes and make your code more robust when dealing with list operations.

PyGuide

PyGuide

Python List Index Error Handling Iteration Code Examples

Python List Index Error Handling Iteration Code Examples

Safe List Access Functions #

Basic Safe Access with Default Values #

🐍 Try it yourself

Advanced Safe Access with Type Checking #

🐍 Try it yourself

Iteration Safety Utilities #

Safe Range Iterator #

🐍 Try it yourself

List Modification During Iteration #

🐍 Try it yourself

Nested List Safety #

Safe Nested Access #

🐍 Try it yourself

Error Handling Decorators #

Index Error Handler Decorator #

🐍 Try it yourself

Practical Utility Functions #

Batch Processing with Error Handling #

🐍 Try it yourself

Summary #

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