Here is a list of 50 useful built-in modules in Python:
- sys - provides access to system-specific parameters and functions
- os - provides functions for interacting with the operating system
- math - provides mathematical functions
- random - provides functions for generating random numbers
- datetime - provides classes for working with dates and times
- json - provides functions for working with JSON data
- re - provides functions for working with regular expressions
- urllib - provides functions for working with URLs
- xml - provides functions for working with XML
- email - provides functions for working with email messages
- hashlib - provides functions for calculating hash values
- hmac - provides functions for calculating HMAC values
- itertools - provides functions for working with iterators
- collections - provides additional data types for working with collections of data
- heapq - provides functions for working with heaps
- bisect - provides functions for working with sorted lists
- array - provides functions for working with arrays
- queue - provides thread-safe FIFO implementation
- struct - provides pack and unpack functions for working with C-style data structures
- threading - provides functions for working with threads
- multipaddress - provides functions for working with IP addresses
- subprocess - provides functions for working with subprocesses
- tempfile - provides functions for working with temporary files and directories
- shutil - provides functions for working with files and directories
- glob - provides functions for working with file patterns
- fnmatch - provides functions for matching file patterns
- fnmatch - provides functions for matching file patterns
- zipfile - provides functions for working with zip archives
- tarfile - provides functions for working with tar archives
- gzip - provides functions for working with gzip files
- bz2 - provides functions for working with bzip2 files
- lzma - provides functions for working with LZMA files
- time - provides functions for working with time
- calendar - provides functions for working with calendars
- locale - provides functions for internationalization
- gettext - provides functions for internationalization
- locale - provides functions for internationalization
- getopt - provides functions for parsing command-line options
- argparse - provides functions for parsing command-line options
- logging - provides functions for logging
- logging.config - provides functions for configuring logging
- logging.handlers - provides additional handler classes for logging
- pprint - provides functions for pretty-printing data structures
- cProfile - provides functions for profiling Python code
- pstats - provides functions for working with profiling statistics
- timeit - provides functions for measuring the execution time of small bits of Python code
- trace - provides functions for tracing the execution of Python code
- unittest - provides a unit testing framework
- doctest - provides a framework for running tests embedded in documentation
- unittest.mock - provides a library for testing in Python
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