50 useful built-in modules in Python

Here is a list of 50 useful built-in modules in Python:

1. sys - provides access to system-specific parameters and functions
2. os - provides functions for interacting with the operating system
3. math - provides mathematical functions
4. random - provides functions for generating random numbers
5. datetime - provides classes for working with dates and times
6. json - provides functions for working with JSON data
7. re - provides functions for working with regular expressions
8. urllib - provides functions for working with URLs
9. xml - provides functions for working with XML
10. email - provides functions for working with email messages
11. hashlib - provides functions for calculating hash values
12. hmac - provides functions for calculating HMAC values
13. itertools - provides functions for working with iterators
14. collections - provides additional data types for working with collections of data
15. heapq - provides functions for working with heaps
16. bisect - provides functions for working with sorted lists
17. array - provides functions for working with arrays
18. queue - provides thread-safe FIFO implementation
19. struct - provides pack and unpack functions for working with C-style data structures
20. threading - provides functions for working with threads
21. multipaddress - provides functions for working with IP addresses
22. subprocess - provides functions for working with subprocesses
23. tempfile - provides functions for working with temporary files and directories
24. shutil - provides functions for working with files and directories
25. glob - provides functions for working with file patterns
26. fnmatch - provides functions for matching file patterns
27. fnmatch - provides functions for matching file patterns
28. zipfile - provides functions for working with zip archives
29. tarfile - provides functions for working with tar archives
30. gzip - provides functions for working with gzip files
31. bz2 - provides functions for working with bzip2 files
32. lzma - provides functions for working with LZMA files
33. time - provides functions for working with time
34. calendar - provides functions for working with calendars
35. locale - provides functions for internationalization
36. gettext - provides functions for internationalization
37. locale - provides functions for internationalization
38. getopt - provides functions for parsing command-line options
39. argparse - provides functions for parsing command-line options
40. logging - provides functions for logging
41. logging.config - provides functions for configuring logging
42. logging.handlers - provides additional handler classes for logging
43. pprint - provides functions for pretty-printing data structures
44. cProfile - provides functions for profiling Python code
45. pstats - provides functions for working with profiling statistics
46. timeit - provides functions for measuring the execution time of small bits of Python code
47. trace - provides functions for tracing the execution of Python code
48. unittest - provides a unit testing framework
49. doctest - provides a framework for running tests embedded in documentation
50. unittest.mock - provides a library for testing in Python