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Python FTP server library provides a high-level portable interface to easily write very efficient, scalable and asynchronous FTP servers with Python. It is the most complete RFC-959 FTP server implementation available for Python programming language and it’s used in projects like Google Chromium and Bazaar and included in Debian, Fedora and FreeBSD package repositories.

  • Extremely lightweight, fast and scalable (see why and benchmarks).
  • Uses sendfile(2) (see pysendfile) system call for uploads.
  • Uses epoll() / kqueue() / select() to handle concurrency asynchronously.
  • . But can optionally skip to a multiple thread / process model (as in: you’ll be free to block or use slow filesystems).
  • Portable: entirely written in pure Python works with Python from 2.6 to 3.5 by using a single code base.
  • Supports FTPS (RFC-4217), IPv6 (RFC-2428), Unicode file names (RFC-2640), MLSD/MLST commands (RFC-3659).
  • Support for virtual users and virtual filesystem.
  • Extremely flexible system of «authorizers» able to manage both «virtual» and «real» users on on both UNIX and Windows.
  • Test coverage close to 100%.

Despite being written in an interpreted language, pyftpdlib has transfer rates superior to most common UNIX FTP servers. It also scales better since whereas vsftpd and proftpd use multiple processes to achieve concurrency, pyftpdlib will only use one process and handle concurrency asynchronously (see the C10K problem). Here are some benchmarks made against my Linux 3.0.0 box, Intel core-duo 3.1 Ghz:

benchmark type pyftpdlib proftpd speedup
STOR (client -> server) 585.90 MB/sec 600.49 MB/sec -0.02x
RETR (server -> client) 1652.72 MB/sec 1524.05 MB/sec +0.08
300 concurrent clients (connect, login) 0.19 secs 9.98 secs +51x
STOR (1 file with 300 idle clients) 585.59 MB/sec 518.55 MB/sec +0.1x
RETR (1 file with 300 idle clients) 1497.58 MB/sec 1478.19 MB/sec 0x
300 concurrent clients (RETR 10M file) 3.41 secs 3.60 secs +0.05x
300 concurrent clients (STOR 10M file) 8.60 secs 11.56 secs +0.3x
300 concurrent clients (QUIT) 0.03 secs 0.39 secs +12x
benchmark type pyftpdlib vsftpd speedup
STOR (client -> server) 585.90 MB/sec 611.73 MB/sec -0.04x
RETR (server -> client) 1652.72 MB/sec 1512.92 MB/sec +0.09
300 concurrent clients (connect, login) 0.19 secs 20.39 secs +106x
STOR (1 file with 300 idle clients) 585.59 MB/sec 610.23 MB/sec -0.04x
RETR (1 file with 300 idle clients) 1497.58 MB/sec 1493.01 MB/sec 0x
300 concurrent clients (RETR 10M file) 3.41 secs 3.67 secs +0.07x
300 concurrent clients (STOR 10M file) 8.60 secs 9.82 secs +0.07x
300 concurrent clients (QUIT) 0.03 secs 0.01 secs +0.14x

A lot of time and effort went into making pyftpdlib as it is right now. If you feel pyftpdlib is useful to you or your business and want to support its future development please consider donating me some money.

Some famous trademarks which adopted pyftpdlib (complete list).

docs/images/chrome.jpg docs/images/debian.png docs/images/fedora.png docs/images/openerp.jpg docs/images/bazaar.jpg docs/images/bitsontherun.png docs/images/openvms.png docs/images/smartfile.png

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