Implement a function that returns the nth Fibonacci number. Optimize for performance if possible.
Implement a function that sums two numbers. Include basic type checking.
Write a function that checks if a string is a palindrome (ignoring spaces and case).
Write a recursive function to calculate the factorial of a number. Include error handling.
Implement a function that sums all numbers in a list. Handle edge cases.
Use the json module to parse and pretty-print JSON data. Handle invalid JSON gracefully.
Use the datetime module to calculate date differences and format dates.
Use the re module to validate email addresses with regular expressions.
Use lodash library to transform and manipulate arrays and objects.
Use Google GSON library to serialize/deserialize Java objects to/from JSON.
Analyze sales data using Pandas. Load a CSV file, calculate statistics, and filter data based on conditions.
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