Added class and os alternates

.oh-my-zsh/plugins/virtualenv/README.md

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+# virtualenv
+
+The plugin displays information of the created virtual container and allows background theming.
+
+To use it, add `virtualenv` to the plugins array of your zshrc file:
+```
+plugins=(... virtualenv)
+```
+
+The plugin creates a `virtualenv_prompt_info` function that you can use in your theme, which displays
+the basename of the current `$VIRTUAL_ENV`. It uses two variables to control how that is shown:
+
+- `ZSH_THEME_VIRTUALENV_PREFIX`: sets the prefix of the VIRTUAL_ENV. Defaults to `[`.
+
+- `ZSH_THEME_VIRTUALENV_SUFFIX`: sets the suffix of the VIRTUAL_ENV. Defaults to `]`.

.oh-my-zsh/plugins/virtualenv/virtualenv.plugin.zsh

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+function virtualenv_prompt_info(){
+  [[ -n ${VIRTUAL_ENV} ]] || return
+  echo "${ZSH_THEME_VIRTUALENV_PREFIX:=[}${VIRTUAL_ENV:t}${ZSH_THEME_VIRTUALENV_SUFFIX:=]}"
+}
+
+# disables prompt mangling in virtual_env/bin/activate
+export VIRTUAL_ENV_DISABLE_PROMPT=1