1. from datetime import datetime
  3. def parse_date_safely(date_string, format='%Y-%m-%d'):
  4. """
  5. Parses a date string with error handling.
  7. Args:
  8. date_string (str): The date string to parse.
  9. format (str): The expected date format.
  11. Returns:
  12. datetime: A datetime object if parsing is successful,
  13. or None if parsing fails.
  14. """
  15. try:
  16. # Attempt to parse the date string
  17. date_object = datetime.strptime(date_string, format)
  18. return date_object
  19. except ValueError:
  20. # Handle cases where the date string doesn't match the format
  21. print(f"Error: Invalid date format. Expected {format}, got {date_string}")
  22. return None
  23. except TypeError:
  24. # Handle cases where the input is not a string
  25. print(f"Error: Input must be a string. Got {type(date_string)}")
  26. return None
  29. def process_dates(date_strings):
  30. """
  31. Processes a list of date strings, handling potential failures.
  33. Args:
  34. date_strings (list): A list of date strings to process.
  36. Returns:
  37. list: A list of datetime objects (or None for failed parses).
  38. """
  39. results = []
  40. for date_string in date_strings:
  41. date_object = parse_date_safely(date_string)
  42. results.append(date_object)
  43. return results
  45. if __name__ == '__main__':
  46. # Example usage with test cases
  47. date_list = [
  48. "2023-10-26", # Valid date
  49. "2023/10/27", # Invalid format
  50. 123, # Invalid type
  51. "2023-12-31", # Valid date
  52. "invalid-date" # Invalid date format
  53. ]
  55. processed_dates = process_dates(date_list)
  57. for i, date in enumerate(processed_dates):
  58. print(f"Date {date_list[i]}: {date}")

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