pyenv/libexec/pyenv-local

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#!/usr/bin/env bash
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#
# Summary: Set or show the local application-specific Python version
#
# Usage: pyenv local <version>
# pyenv local --unset
#
# Sets the local application-specific Python version by writing the
# version name to a file named `.python-version'.
#
# When you run a Python command, pyenv will look for a `.python-version'
# file in the current directory and each parent directory. If no such
# file is found in the tree, pyenv will use the global Python version
# specified with `pyenv global'. A version specified with the
# `PYENV_VERSION' environment variable takes precedence over local
# and global versions.
#
# <version> should be a string matching a Python version known to pyenv.
# The special version string `system' will use your default system Python.
# Run `pyenv versions' for a list of available Python versions.
set -e
[ -n "$PYENV_DEBUG" ] && set -x
# Provide pyenv completions
if [ "$1" = "--complete" ]; then
echo --unset
echo system
exec pyenv-versions --bare
fi
versions=("$@")
if [ "$versions" = "--unset" ]; then
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rm -f .python-version
elif [ -n "$versions" ]; then
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pyenv-version-file-write .python-version "${versions[@]}"
else
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if version_file="$(pyenv-version-file "$PWD")"; then
IFS=: versions=($(pyenv-version-file-read "$version_file"))
for version in "${versions[@]}"; do
echo "$version"
done
else
echo "pyenv: no local version configured for this directory" >&2
exit 1
fi
fi