Python on the CS Webservers - Revision history

Pip: /* Python Packages */

2025-10-01T19:33:51Z

Python Packages

Pip: /* Python Packages */

2025-10-01T18:46:57Z

Python Packages

Pip: /* Python Versions */

2025-10-01T18:43:20Z

Python Versions

Pip: /* Python Versions */

2024-08-14T20:16:28Z

Python Versions

Phil: /* Python Versions */

2022-05-16T18:55:44Z

Python Versions

Steve410: /* Python Versions */

2022-05-16T17:49:29Z

Python Versions

Phil at 17:31, 16 May 2022

2022-05-16T17:31:22Z

Phil: /* Python Packages */

2022-05-16T17:14:29Z

Python Packages

Phil at 20:32, 1 July 2021

2021-07-01T20:32:47Z

Phil: /* Python Versions */

2020-12-16T16:01:28Z

Python Versions

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 The set of Python packages installed on the webservers is fairly minimal.  If you need a package that's not installed, you should first try installing it yourself into your home directory, using our [[Python on the CS Linux Clients#Installing_Python_Packages|self-installation instructions]].  If that does not work, you can contact us at {{mailto|support}} for assistance, but be aware that we are not be able to install every requested package.
-If you need a package that is not supported on our web servers' default Python version, you can use the versioned Python executable to set up the virtual environment.  For example, if you had a package that needed Python 3.11 or later, you could run <kbd>python3.11 -m venv <var>/path/to/venv/directory</var></kbd>.  See the previous section for which versions of Python are available on both our web servers and our Linux clients.
+If you need a package that is not supported on our web servers' default Python version, you can use the versioned Python executable to set up the virtual environment.  For example, if you had a package that needed Python 3.11 or later, you could run <kbd>python3.11 -m venv <var>/path/to/venv/directory</var></kbd>.  If you run a Python program in such a venv, it will use the version of Python you used to set up the venv, even if the program starts with {{code|#!/usr/bin/env python3}} or {{code|#!/usr/bin/env python}}.
 == Deployment Options ==

← Older revision		Revision as of 18:46, 1 October 2025
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	The set of Python packages installed on the webservers is fairly minimal. If you need a package that's not installed, you should first try installing it yourself into your home directory, using our [[Python on the CS Linux Clients#Installing_Python_Packages\|self-installation instructions]]. If that does not work, you can contact us at {{mailto\|support}} for assistance, but be aware that we are not be able to install every requested package.		The set of Python packages installed on the webservers is fairly minimal. If you need a package that's not installed, you should first try installing it yourself into your home directory, using our [[Python on the CS Linux Clients#Installing_Python_Packages\|self-installation instructions]]. If that does not work, you can contact us at {{mailto\|support}} for assistance, but be aware that we are not be able to install every requested package.
		+
		+	If you need a package that is not supported on our web servers' default Python version, you can use the versioned Python executable to set up the virtual environment. For example, if you had a package that needed Python 3.11 or later, you could run <kbd>python3.11 -m venv <var>/path/to/venv/directory</var></kbd>. See the previous section for which versions of Python are available on both our web servers and our Linux clients.

	== Deployment Options ==		== Deployment Options ==

@@ Line 5: / Line 5: @@
 == Python Versions ==
-The webservers have both Python 3 and Python 2 available.  As of February 2021, the webservers are specifically using '''''Python 3.6'''''.  This is ''different'' from the [[:Category:Linux Clients|Linux clients]], which use a ''newer'' version.  If you're writing programs to run on one of the department webservers, '''we recommend you restrict those programs to use only features available in the webservers' version of Python 3.'''
+The web servers have both Python 3 and Python 2 available.  As of February 2021, the web servers are using '''''Python 3.6''''' by default.  This is ''different'' from the [[:Category:Linux Clients|Linux clients]], which use a ''newer'' version.  (As of fall 2025, the Linux clients use Python 3.13 by default.)  If you're writing programs to run on one of the department web servers, '''we recommend you restrict those programs to use only features available in the web servers' version of Python 3.'''
-The default Python version (what you get when you run the <code>python</code> program) is Python 3.  If you want Python 2, you must specify it explicitly by using <code>python2</code> at the top of your program.  Python 2 will be removed from our web servers at some future date no later than the summer of 2029.  (Note that Python2 will not be on our Linux clients after summer 2025.)
+The web servers have several other versions of Python ''available''.  The Python versions available on both the web servers and the Linux clients are:
-It's good practice to explicitly use <code>python3</code> when you intend to use Python 3.  Using <code>python</code> by itself is only recommended [https://www.python.org/dev/peps/pep-0394/ in a handful of situations] that mostly don't apply to our webservers.
+* Python 3.6 (default on the web servers)
 == Python Packages ==

@@ Line 7: / Line 7: @@
 The webservers have both Python 3 and Python 2 available.  As of February 2021, the webservers are specifically using '''''Python 3.6'''''.  This is ''different'' from the [[:Category:Linux Clients|Linux clients]], which use a ''newer'' version.  If you're writing programs to run on one of the department webservers, '''we recommend you restrict those programs to use only features available in the webservers' version of Python 3.'''
-The default Python version (what you get when you run the <code>python</code> program) is Python 3.  If you want Python 2, you must specify it explicitly by using <code>python2</code> at the top of your program.
+The default Python version (what you get when you run the <code>python</code> program) is Python 3.  If you want Python 2, you must specify it explicitly by using <code>python2</code> at the top of your program.  Python 2 will be removed from our web servers at some future date no later than the summer of 2029.  (Note that Python2 will not be on our Linux clients after summer 2025.)
 It's good practice to explicitly use <code>python3</code> when you intend to use Python 3.  Using <code>python</code> by itself is only recommended [https://www.python.org/dev/peps/pep-0394/ in a handful of situations] that mostly don't apply to our webservers.

← Older revision		Revision as of 18:55, 16 May 2022
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	The webservers have both Python 3 and Python 2 available. As of February 2021, the webservers are specifically using '''''Python 3.6'''''. This is ''different'' from the [[:Category:Linux Clients\|Linux clients]], which use a ''newer'' version. If you're writing programs to run on one of the department webservers, '''we recommend you restrict those programs to use only features available in the webservers' version of Python 3.'''		The webservers have both Python 3 and Python 2 available. As of February 2021, the webservers are specifically using '''''Python 3.6'''''. This is ''different'' from the [[:Category:Linux Clients\|Linux clients]], which use a ''newer'' version. If you're writing programs to run on one of the department webservers, '''we recommend you restrict those programs to use only features available in the webservers' version of Python 3.'''
		+
	The default Python version (what you get when you run the <code>python</code> program) is Python 3. If you want Python 2, you must specify it explicitly by using <code>python2</code> at the top of your program.		The default Python version (what you get when you run the <code>python</code> program) is Python 3. If you want Python 2, you must specify it explicitly by using <code>python2</code> at the top of your program.

@@ Line 5: / Line 5: @@
 == Python Versions ==
-The webservers have both Python 3 and Python 2 available.  As of January 2020, they are specifically running Python versions 3.4 and 2.6.
+The webservers have both Python 3 and Python 2 available.  <!-- As of December 2020, they are specifically running Python versions 3.6 and 2.6. -->
-The default Python version (what you get when you run the <code>python</code> program) is Python 2.  At some point, that will change to Python 3.  You should specify the Python version in your programs by explicitly using either the <code>python2</code> or <code>python3</code> program.
+The default Python version (what you get when you run the <code>python</code> program) on our ugrad webserver ([https://ugrad.cs.jhu.edu ugrad.cs.jhu.edu]) is Python 3.  If you want Python 2, you must specify it explicitly by using <code>python2</code> at the top of your program.
 == Python Packages ==