remove redundant environment variable declaration

README.md

@@ -243,7 +243,7 @@ You can set certain environment variables to control pyenv-virtualenv.
 * `PIP_VERSION`, if set and `venv` is preferred
   over `virtualenv`, install the specified version of pip.
 * `PYENV_VIRTUALENV_VERBOSE_ACTIVATE`, if set, shows some verbose outputs on activation and deactivation
-* `PYENV_VIRTUALENV_PROMPT`, if set, allows users to customize how `pyenv-virtualenv` modifies their shell prompt. The default prompt ("(venv)") is overwritten with any user-specified text. Specify the location of the virtual environment name with the string `{venv}`.
+* `PYENV_VIRTUALENV_PROMPT`, if set, allows users to customize how `pyenv-virtualenv` modifies their shell prompt. The default prompt ("(venv)") is overwritten with any user-specified text. Specify the location of the virtual environment name with the string `{venv}`. For example, the default prompt string would be `({venv})`.
 
 ## Version History
 

test/activate.bats

@@ -15,6 +15,7 @@ setup() {
   unset PYENV_VIRTUALENV_DISABLE_PROMPT
   unset PYENV_VIRTUAL_ENV_DISABLE_PROMPT
   unset VIRTUAL_ENV_DISABLE_PROMPT
+  unset PYENV_VIRTUALENV_PROMPT
   unset _OLD_VIRTUAL_PS1
   stub pyenv-hooks "activate : echo"
 }

test/conda-activate.bats

@@ -16,6 +16,7 @@ setup() {
   unset PYENV_VIRTUALENV_DISABLE_PROMPT
   unset PYENV_VIRTUAL_ENV_DISABLE_PROMPT
   unset VIRTUAL_ENV_DISABLE_PROMPT
+  unset PYENV_VIRTUALENV_PROMPT
   unset _OLD_VIRTUAL_PS1
   stub pyenv-hooks "activate : echo"
 }

test/hooks.bats

@@ -6,6 +6,7 @@ setup() {
   export PYENV_ROOT="${TMP}/pyenv"
   export HOOK_PATH="${TMP}/i has hooks"
   mkdir -p "$HOOK_PATH"
+  unset PYENV_VIRTUALENV_PROMPT
 }
 
 @test "pyenv-virtualenv hooks" {