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Wiki source code of VirtualEnv

Version 8.1 by David De La Harpe Golden on 2026/05/17 16:17
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1 While historically I use python virtualenv helpers like
2
3 * [[vex>>https://pypi.org/project/vex/]]
4 * [[virtualenvwrapper>>https://pypi.org/project/virtualenvwrapper/]]
5 * [[virtualenvwrapper-win>>https://pypi.org/project/virtualenvwrapper-win/]]
6
7 ...since virtualenv is now in the python stdlib, I have lately pared it down to two little helpers
8
9 * ##mkve## - makes a new basic virtualenv.
10 * ##ve## - launches a subshell with the virtualenv active - in contrast to the weird way official activate does within the current shell i.e like ##vex## but less fancy.
11
12 {{code language="bash"}}
13 $ mkve BlahVenv
14 $ ve BlahVenv
15 $ pip install av
16 $ exit
17 {{/code}}
18
19
20 == mkve ==
21
22 {{code language="bash"}}
23 #!/bin/bash
24 # make a new python venv:
25 # mkve SomeVenv
26
27 if [ -e "$1" ] ; then
28 echo >&2 "Already exists. Use python -m venv ... directly for complex args."
29 else
30 exec python -m venv "$1"
31 fi
32
33 {{/code}}
34
35
36 == ve ==
37
38 {{code language="bash"}}
39
40 #!/bin/bash
41 # use an existing python venv in a subshell, exit to exit:
42 # ve SomeVenv
43
44 if [ -f "$1/bin/activate" ]; then
45 exec bash --rcfile <(cat ~/.bashrc $1/bin/activate)
46 else
47 echo >&2 "Missing Python Virtual Env (should have venv/bin/activate script)"
48 fi
49
50 {{/code}}
51
52
53 == Shell Prompt ==
54
55 I have a fancy non-default prompt in my ##~/.bashrc## that shows a little snake if in a python vm
56
57 {{code language="bash"}}
58 # venvs themselves prefix these days, new ones created by stdlib honor this disable, allowing us to customize
59 export VIRTUAL_ENV_DISABLE_PROMPT=1
60 PS1='${debian_chroot:+\[\033[01;33m\]🌲($debian_chroot)\[\033[00m\]}${VIRTUAL_ENV:+\[\033[01;36m\]🐍($(basename $VIRTUAL_ENV))\[\033[00m\]}\[\033[38;5;108m\]\u@\h\[\033[38;5;128m\]:\[\033[38;5;139m\]\w\[\033[38;5;129m\]\$\[\033[00m\] '
61 {{/code}}