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pymzML - an interface between Python and mzML Mass spectrometry Files
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Introduction Documentation Status AppVeyor CI status

General information

Module to parse mzML data in Python based on cElementTree

Copyright 2010-2018 by:

M. Kösters,
J. Leufken,
T. Bald,
A. Niehues,
S. Schulze,
K. Sugimoto,
R.P. Zahedi,
M. Hippler,
S.A. Leidel,
C. Fufezan,

Contact information

Please refer to:

Dr. Christian Fufezan
Group Leader Experimental Bioinformatics
Cellzome GmbH
R&D Platform Technology & Science

http:// <in transition >


pymzML is an extension to Python that offers
    1. easy access to mass spectrometry (MS) data that allows the rapid development of tools
    1. a very fast parser for mzML data, the standard mass spectrometry data format
    1. a set of functions to compare and/or handle spectra
    1. random access in compressed files
    1. interactive data visualization


pymzML requires Python3.4+. The module is freely available on or pypi, published under GPL and requires no additional modules to be installed, but can optionally use numpy.


Get the latest version via github
The complete Documentation can be found as pdf


M Kösters, J Leufken, S Schulze, K Sugimoto, J Klein, R P Zahedi, M Hippler, S A Leidel, C Fufezan; pymzML v2.0: introducing a highly compressed and seekable gzip format, Bioinformatics, doi:


pymzML requires Python 3.4 or higher.


Consider to use a Python virtual environment for easy installation and use. Further, usage of python3.4+ is recommended.

Download pymzML using GitHub or the zip file:

  • GitHub version: Start by cloning the GitHub repository:

    user@localhost:~$ git clone
    user@localhost:~$ cd pymzml
    user@localhost:~$ pip install -r requirements.txt
    user@localhost:~$ python install

If you have troubles installing the dependencies, install numpy first separately, since pynumpress requires numpy to be installed.

If you use Windows 7 please use the 'SDK7.1 command prompt' for installation of pymzML to assure correct compiling of the C extensions.


To test the package and correct installation:

nosetests tests/*.py
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