Python 3.13 Removed Modules Under PEP 594

Python 3.13 permanently removed 19 legacy standard library modules as the final implementation phase of PEP 594, titled "Removing dead batteries from the standard library." First marked as deprecated in Python 3.11, these modules were eliminated to trim unmaintained code, reduce security vulnerabilities, and eliminate obsolete protocols and historical platform dependencies. Below is the complete breakdown of every module permanently removed in Python 3.13 alongside recommended modern replacements.

Audio and Multimedia Modules

• aifc: Handled reading and writing of AIFF and AIFC audio formats.
  • Replacement: Use third-party libraries such as soundfile or scipy.io.wavfile.
• audioop: Provided low-level operations on raw sound data chunks.
  • Replacement: For projects unable to refactor immediate audio transformations, use the community-maintained drop-in package audioop-lts on PyPI, or migrate to libraries like numpy or pydub.
• chunk: Provided an interface for reading IFF-chunked data.
  • Replacement: Custom file parsers or specialized media libraries.
• imghdr: Determined the file format of image byte streams.
  • Replacement: Use filetype, puremagic, or the Pillow library.
• ossaudiodev: Linux and FreeBSD Open Sound System (OSS) audio interface.
  • Replacement: Use modern audio drivers via libraries like sounddevice or pygame.
• sndhdr: Determined the file format of various sound files.
  • Replacement: Use filetype or puremagic.
• sunau: Read and wrote Sun AU and NeXT audio files.
  • Replacement: Modern audio packages such as soundfile.

Web, Mail, and Network Protocols

• cgi: Provided Common Gateway Interface helpers for HTTP servers.
  • Replacement: Modern web frameworks (FastAPI, Flask, Django) or standalone parsers such as multipart and urllib.parse.
• cgitb: Traceback manager for CGI scripts.
  • Replacement: Standard logging, modern framework error handlers, or third-party error trackers like Sentry.
• mailcap: Handled Unix mailcap files used to configure helper applications for MIME types.
  • Replacement: Use the mimetypes standard library module or system-level configuration handling.
• nntplib: Usenet news transfer protocol (NNTP) client.
  • Replacement: Specialized third-party packages from PyPI if NNTP support is still required.
• telnetlib: Telnet protocol client.
  • Replacement: Third-party modules such as telnetlib3 or netmiko.

Data Formatting and Encodings

• uu: Provided uuencode and uudecode functionality for binary-to-text translation.
  • Replacement: The standard base64 module or custom wrappers.
• xdrlib: Implemented Sun's External Data Representation (XDR) standard.
  • Replacement: Structured binary protocols like Protocol Buffers, MessagePack, or custom struct implementations.

System, Shell, and Platform Specifics

• crypt: Handled password hashing on Unix systems via the system crypt(3) function.
  • Replacement: The standard hashlib module for modern hashing, or dedicated third-party libraries like bcrypt, argon2-cffi, or passlib.
• msilib: Supported the creation of Windows Installer (.msi) packages.
  • Replacement: External tools such as WiX Toolset or packaging tools like PyInstaller and Inno Setup.
• nis: Interface to Sun's Network Information Service (Yellow Pages).
  • Replacement: System-level directory services or LDAP libraries like ldap3.
• pipes: Constructed Unix shell execution pipelines.
  • Replacement: The standard subprocess module.
• spwd: Direct interface to Unix shadow password database (/etc/shadow).
  • Replacement: Modern system authentication modules like PAM via python-pam.