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Build status PyPI version Python 3.7 License


An IPython magic extension for printing date and time stamps, version numbers, and hardware information.




Using watermark in Jupyter notebooks and IPython sessions

More examples can be found in this Jupyter notebook.


Using watermark as a module

from watermark import watermark
Last updated: 2022-09-13T16:28:56.177487-05:00

Python implementation: CPython
Python version       : 3.9.13
IPython version      : 8.4.0

Compiler    : Clang 13.0.1 
OS          : Darwin
Release     : 21.6.0
Machine     : arm64
Processor   : arm
CPU cores   : 10
Architecture: 64bit
numpy: 1.23.2
scipy: 1.9.1

See help(watermark) for more options.

Installation and updating


The watermark line magic can be installed by executing

pip install watermark

Alternatively, you can install the latest development version directly from GitHub via

pip install -e git+


To remove an old watermark installation (installed via the deprecated %install_ext magic extension), simply delete it from the .ipython/extensions/ directory, which is typically located in a user's home directory.



After successful installation, the watermark magic extension can be loaded via:

%load_ext watermark

To get an overview of all available commands, type:


  %watermark [-a AUTHOR] [-gu GITHUB_USERNAME] [-e EMAIL] [-ws WEBSITE]
                 [-d] [-n] [-t] [-i] [-z] [-u] [-c CUSTOM_TIME] [-v]
                 [-p PACKAGES] [-co] [-h] [-m] [-g] [-r] [-b] [-w] [-iv]

IPython magic function to print date/time stamps
and various system information.

optional arguments:
  -a AUTHOR, --author AUTHOR
                        prints author name
  -gu GITHUB_USERNAME, --github_username GITHUB_USERNAME
                        prints author github username
  -e EMAIL, --email EMAIL
                        prints author email
  -ws WEBSITE, --website WEBSITE
                        prints author or project website
  -d, --date            prints current date as YYYY-mm-dd
  -n, --datename        prints date with abbrv. day and month names
  -t, --time            prints current time as HH-MM-SS
  -i, --iso8601         prints the combined date and time including the time
                        zone in the ISO 8601 standard with UTC offset
  -z, --timezone        appends the local time zone
  -u, --updated         appends a string "Last updated: "
  -c CUSTOM_TIME, --custom_time CUSTOM_TIME
                        prints a valid strftime() string
  -v, --python          prints Python and IPython version
  -p PACKAGES, --packages PACKAGES
                        prints versions of specified Python modules and
  -co, --conda          prints name of current conda environment
  -h, --hostname        prints the host name
  -m, --machine         prints system and machine info
  -g, --githash         prints current Git commit hash
  -r, --gitrepo         prints current Git remote address
  -b, --gitbranch       prints current Git branch
  -w, --watermark       prints the current version of watermark
  -iv, --iversions      prints the name/version of all imported modules

Development guidelines


In line with NEP 29, this project supports:

  • All minor versions of Python released 42 months prior to the project, and at minimum the two latest minor versions.



v. 2.4.3 (May 23, 2023)

  • Make py3nvml installation for GPU info optional. (#92, via contribution by Ben Greiner)

v. 2.4.1 and v 2.4.2 (May 23, 2023)

  • PyPI and Conda-Forge packaging fixes.

v. 2.4.0 (May 23, 2023)

  • Adds a new --gpu flag to print out GPU information (currently limited to NVIDIA devices) (#90, via contribution by 907Resident)

v. 2.3.1 (May 27, 2022)

v. 2.3.0 (January 3, 2022)

  • Added the following arguments: --github_username - for prints author github username, --email - for prints author email, --website - for prints author or project website. (#82, via contribution by joschkazj)
  • Added a --conda option to print the name of the current conda environment. (#79, via contribution by Alexander Krasnikov)
  • It is now possible to inject globals when used outside IPython (#80, via contribution by Hugo Lapré). For example, version numbers of imported packages can now be obtained as follows:
import numpy
import watermark.watermark as watermark

watermark(iversions=True, globals_=globals())

v. 2.2.0 (February 17, 2021)

  • Refactoring such that a watermark() function now also works outside IPython and Jupyter. Now, the magic %watermark calls watermark(). Calling %watermark via IPython and Juypter still works as usual. However, in addition the watermark() function can be used within regular Python for unit testing purposes etc. (#46, via contribution by Tymoteusz Wołodźko)

v. 2.1.0 (November 23, 2020)

  • Adopt NEP 29 and require Python version 3.7 or newer. (#63, via contribution by James Myatt)
  • Add Python 3.8 and 3.9 to Travis CI builds. (#63, via contribution by James Myatt)
  • Fix: Allow to run without install_requires already installed (#67, via contribution by James Myatt)
  • Major refactoring to improve code readability (#64 and 65, via contribution by Bahram Aghaei)
  • Use importlib and importlib.metadata to determine package version numbers. (#66, via contribution by James Myatt)

v. 2.0.2 (November 19, 2019)

  • Support VERSION attributes, in addition to __version__ attributes.

v. 2.0.1 (October 04, 2019)

  • Fix 'sklearn' vs. 'scikit-learn' import compatibility.

v. 2.0.0 (October 04, 2019)

  • Now uses pkg_resources as the default method for getting version numbers.
  • Fixes a whitespace bug when printing the timezone.

v. 1.8.2 (July 28, 2019)

  • When no Python library was imported and the --iversion is used, print an empty string instead of raising an error.

v. 1.8.1 (January 26, 2019)

  • Fixes string alignment issues when the -iv/--iversion flag is used.

v. 1.8.0 (January 02, 2019)

  • The -iv/--iversion flag now also shows package versions that were imported as from X import Y and import X.Y as Y. For example,
import scipy as sp
from sklearn import metrics
import numpy.linalg as linalg
%watermark --iversions

will return

scipy     1.1.0
sklearn   0.20.1
numpy     1.15.4

v. 1.7.0 (October 13, 2018)

(Via contribution by James Myatt)

  • Shows "not installed" for version of packages/modules that cannot be imported.
  • Shows "unknown" for version of packages/modules when version attribute cannot be found.
  • Add Python 3.6 and 3.7 to Travis CI builds.
  • Add classifiers to setuptools configuration.

v. 1.6.1 (June 10, 2018)

  • Now also includes the LICENSE file in the Python Wheels distribution

v. 1.6.0 (Jan uary18, 2018)

  • Adds a new -b/--gitbranch parameter that prints the current Git branch.

v. 1.5.0 (August 27, 2017)

  • Adds a new -iv/ --iversions parameter that prints the package names and version numbers of all packages that were previously imported in the current Python session. (Via contribution by Aziz Alto)

v. 1.4.0 (April 18, 2017)

  • Adds a new -r/ --gitrepo parameter that returns the URL of Git remote name "origin". (Via contribution by Lucy Park)

v. 1.3.4 (October 15, 2016)

  • Allow fetching scikit-learn's version number via -p scikit-learn in addition of -p sklearn (the former is deprecated and will not be supported in watermark > 1.7).

v. 1.3.3 (September 1, 2016)

  • Includes LICENSE in for packaging

v. 1.3.2 (August 16, 2016)

  • Fixes an issue where the wrong package info was obtained when using the system level Jupyter within a virtualenv environment. (Via contribrution by Michael Bell)
  • Adds a new -i/ --iso8601 parameter that returns the current date-time string in ISO 8601 format with offset to UTC. For instance: 2016-08-16T18:03:42-04:00. Current caveat: Python < 3.2 requires external libraries for for computing the timezone offset, thus, Python < 3.2 will currently only print 2016-08-16T18:03:42
  • Adds offsets to UTC to the default date-time string for Python >= 3.2

v. 1.3.1 (June 6, 2016)

  • Fixes an issue that caused problems importing watermark using Python 2.x

v. 1.3.0 (May 21, 2016)

  • Removed the deprecated the %install_ext magic so that watermark can now be installed as a regular python package via pip (Via contribution by Peter Bull)

v. 1.2.3 (January 29, 2016)

  • Changed date format to the unambiguous ISO-8601 format
  • Ditched the deprecated %install_ext function and made watermark a proper Python package
  • Released the new version under a more permissive newBSD license

v. 1.2.2 (June 17, 2015)

  • Changed the default date-format of -d, --date to MM/DD/YYYY, the format DD/MM/YYYY can be used via the shortcut -e, --eurodate.

v. 1.2.1 (March 3, 2015)

  • Small bugfix to allow custom time string formatting.

v. 1.2.0 (October 1, 2014)

  • --watermark command added to print the current version of watermark.
  • Print author name on a separate line
  • Fixed bug that day takes the same value as the minute if the -n flag is used.


An IPython magic extension for printing date and time stamps, version numbers, and hardware information








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