diff --git a/pypi_release.py b/pypi_release.py
new file mode 100644
index 0000000..4de69c0
--- /dev/null
+++ b/pypi_release.py
@@ -0,0 +1,420 @@
+import argparse
+import re
+import shutil
+import subprocess
+import sys
+import textwrap
+import time
+
+from voussoirkit import passwordy
+from voussoirkit import winwhich
+
+GIT = winwhich.which('git')
+PY = winwhich.which('py')
+TWINE = winwhich.which('twine')
+
+BUMP_PATTERN = r'Bump to version (\d+\.\d+\.\d+)\.'
+
+DEBUG = False
+
+class PypiReleaseError(Exception):
+    pass
+
+class BadSetup(PypiReleaseError):
+    pass
+
+class DirtyState(PypiReleaseError):
+    pass
+
+class NotSemver(PypiReleaseError):
+    pass
+
+class VersionOutOfOrder(PypiReleaseError):
+    pass
+
+# HELPER FUNCTIONS
+################################################################################
+def bump_version(version, versionbump):
+    (major, minor, patch) = [int(x) for x in version.split('.')]
+    if versionbump == 'major':
+        major += 1
+        minor = 0
+        patch = 0
+    elif versionbump == 'minor':
+        minor += 1
+        patch = 0
+    elif versionbump == 'patch':
+        patch += 1
+    else:
+        raise ValueError(f'versionbump should be major, minor, or patch, not {versionbump}.')
+    version = f'{major}.{minor}.{patch}'
+    return version
+
+def check_call(command, show_command=True):
+    if DEBUG or show_command:
+        print_command(command)
+    return subprocess.check_call(command)
+
+def check_output(command, show_command=True):
+    if DEBUG or show_command:
+        print_command(command)
+    return subprocess.check_output(command, stderr=subprocess.STDOUT)
+
+def pick_versionbump(major, minor, patch):
+    mmp = (major, minor, patch)
+    if not all(b in [True, False, None] for b in mmp):
+        raise TypeError('major, minor, patch should all be True, False, or None.')
+
+    if mmp in [(False, False, False), (None, None, None)]:
+        versionbump = 'patch'
+
+    elif mmp.count(True) > 1:
+        raise TypeError('Must only pick one of major, minor, patch.')
+
+    elif major:
+        versionbump = 'major'
+
+    elif minor:
+        versionbump = 'minor'
+
+    elif patch:
+        versionbump = 'patch'
+
+    else:
+        raise TypeError()
+
+    return versionbump
+
+def print_command(command):
+    cmd = [('"%s"' % x) if (' ' in x or x == '') else x for x in command]
+    cmd = ' '.join(cmd)
+    cmd = cmd.strip()
+    cmd = cmd.replace(GIT, 'git')
+    cmd = cmd.replace(PY, 'py')
+    cmd = cmd.replace(TWINE, 'twine')
+    print(f'> {cmd}')
+
+def semver_split(semver):
+    original = semver
+    try:
+        semver = semver.strip('v')
+        mmp = semver.split('.')
+        mmp = tuple(int(x) for x in mmp)
+        (major, minor, patch) = mmp
+        return mmp
+    except Exception:
+        raise NotSemver(original)
+
+def slowprint(s=None):
+    slow = 0.05
+    if s is None:
+        print()
+        time.sleep(slow)
+        return
+    for line in s.split('\n'):
+        print(line)
+        time.sleep(slow)
+
+# SETUP.PY
+################################################################################
+def extract_info_from_setup():
+    handle = open('setup.py', 'r', encoding='utf-8')
+    with handle:
+        setup_py = handle.read()
+
+    name = re.findall(r'''\bname=["']([A-Za-z0-9_-]+)["']''', setup_py)
+    if len(name) != 1:
+        raise BadSetup(f'Expected to find 1 name but found {len(name)}.')
+    name = name[0]
+
+    version = re.findall(r'''\bversion=["'](\d+\.\d+\.\d+)["']''', setup_py)
+    if len(version) != 1:
+        raise BadSetup(f'Expected to find 1 version but found {len(version)}.')
+    version = version[0]
+
+    return (setup_py, name, version)
+
+def update_info_in_setup(setup_py, name, version):
+    re_from = fr'''\bname=(["'])({name})(["'])'''
+    re_to = fr'''name=\1\2\3'''
+    setup_py = re.sub(re_from, re_to, setup_py)
+
+    re_from = fr'''\bversion=(["'])(\d+\.\d+\.\d+)(["'])'''
+    re_to = fr'''version=\g<1>{version}\g<3>'''
+    setup_py = re.sub(re_from, re_to, setup_py)
+    return setup_py
+
+def write_setup(setup_py):
+    handle = open('setup.py', 'w', encoding='utf-8')
+    with handle:
+        handle.write(setup_py)
+
+# GIT
+################################################################################
+def git_assert_current_greater_than_latest(latest_release_version, new_version):
+    if latest_release_version >= semver_split(new_version):
+        raise VersionOutOfOrder(f'New version should be {new_version} but {latest_release_version} already exists.')
+
+def git_assert_no_stashes():
+    command = [GIT, 'stash', 'list']
+    output = check_output(command, show_command=False)
+    lines = output.strip().splitlines()
+    if len(lines) != 0:
+        raise DirtyState('Please ensure there are no stashes.')
+
+def git_assert_pushable():
+    command = [GIT, 'fetch', '--all']
+    check_output(command, show_command=False)
+
+    command = [GIT, 'merge-base', '@', '@{u}']
+    merge_base = check_output(command, show_command=False).strip()
+
+    command = [GIT, 'rev-parse', '@']
+    my_head = check_output(command, show_command=False).strip()
+
+    command = [GIT, 'rev-parse', '@{u}']
+    remote_head = check_output(command, show_command=False).strip()
+
+    if my_head == remote_head:
+        pass
+    elif my_head == merge_base:
+        git_commits_since(merge_base.decode(), show=True, inclusive=True)
+        raise DirtyState('Cant push, need to pull first.')
+    elif remote_head == merge_base:
+        pass
+    else:
+        git_commits_since(merge_base.decode(), show=True, inclusive=True)
+        raise DirtyState('Cant push, diverged from remote.')
+
+def git_commit_bump(version):
+    command = [GIT, 'add', 'setup.py']
+    check_output(command)
+
+    command = [GIT, 'commit', '-m', f'Bump to version {version}.']
+    check_output(command)
+
+def git_commits_since(commit, show, inclusive=False):
+    if commit:
+        if inclusive:
+            commit += '~1'
+        command = [GIT, '--no-pager', 'log', '--oneline', '--graph', '--branches', '--remotes', f'{commit}..']
+    else:
+        command = [GIT, '--no-pager', 'log', '--oneline', '--graph']
+
+    if show:
+        check_call(command, show_command=False)
+    else:
+        output = check_output(command, show_command=False)
+        lines = output.strip().splitlines()
+        return lines
+
+def git_current_remote_branch():
+    command = [GIT, 'rev-parse', '--abbrev-ref', '--symbolic-full-name', '@{u}']
+    output = check_output(command, show_command=False)
+    output = output.strip().decode()
+    (remote, branch) = output.split('/')
+    return (remote, branch)
+
+def git_determine_latest_release():
+    (latest_tagged_commit, latest_tag_version) = git_latest_tagged_commit()
+    (latest_bump_commit, latest_bump_version) = git_latest_bump_commit()
+
+    if latest_tagged_commit is None:
+        latest_release_commit = latest_bump_commit
+        latest_release_version = latest_bump_version
+
+    elif latest_bump_commit is None:
+        latest_release_commit = latest_tagged_commit
+        latest_release_version = latest_tag_version
+
+    elif latest_tag_version > latest_bump_version:
+        latest_release_commit = latest_tagged_commit
+        latest_release_version = latest_tag_version
+
+    else:
+        latest_release_commit = latest_bump_commit
+        latest_release_version = latest_bump_version
+
+    return (latest_release_commit, latest_release_version)
+
+def git_latest_bump_commit():
+    command = [GIT, 'log', '--oneline', '--no-abbrev-commit', '--grep', 'Bump to version *.', '-1']
+    output = check_output(command, show_command=False)
+    output = output.strip()
+    if not output:
+        return (None, None)
+    commit = output.splitlines()[0].decode()
+    version = re.search(BUMP_PATTERN, commit).group(1)
+    version = semver_split(version)
+    commit = commit.split()[0]
+    return (commit, version)
+
+def git_latest_tagged_commit():
+    command = [GIT, 'log', '--oneline', '--no-abbrev-commit', '--tags=v*.*.*', '-1']
+    output = check_output(command, show_command=False)
+    output = output.strip()
+    if not output:
+        return (None, None)
+
+    commit = output.splitlines()[0].decode().split()[0]
+
+    for tag in git_tags_on_commit(commit):
+        try:
+            version = semver_split(tag)
+            break
+        except NotSemver:
+            pass
+    else:
+        return (None, None)
+
+    return (commit, version)
+
+def git_push(remote, branch):
+    command = [GIT, 'push', remote, branch]
+    check_output(command)
+
+def git_push_tag(remote, tag):
+    command = [GIT, 'push', remote, tag]
+    check_output(command)
+
+def git_show_commit(commit):
+    command = [GIT, 'show', '--oneline', '-s', commit]
+    check_call(command, show_command=False)
+
+def git_stash_push():
+    token = passwordy.urandom_hex(32)
+    command = [GIT, 'stash', 'push', '--include-untracked', '--message', token]
+    output = check_output(command)
+
+    command = [GIT, 'stash', 'list', '--grep', token]
+    output = check_output(command).strip()
+
+    did_stash = bool(output)
+    return did_stash
+
+def git_stash_restore():
+    command = [GIT, 'stash', 'pop']
+    output = check_output(command)
+
+def git_tag_version(tag):
+    command = [GIT, 'tag', '-a', tag, '-m', '']
+    check_output(command)
+
+def git_tags_on_commit(commit):
+    command = [GIT, 'tag', '--points-at', commit]
+    output = check_output(command, show_command=False)
+    output = output.strip()
+    if not output:
+        return []
+    output = output.decode().splitlines()
+    return output
+
+# PYPI
+################################################################################
+def pypi_upload(name):
+    egg_dir = f'{name}.egg-info'
+
+    command = [PY, 'setup.py', 'sdist']
+    check_output(command)
+
+    command = [TWINE, 'upload', '-r', 'pypi', 'dist\\*']
+    check_output(command)
+
+    shutil.rmtree('dist')
+    shutil.rmtree(egg_dir)
+
+def pypi_release(do_tag=False, versionbump='patch'):
+    git_assert_no_stashes()
+    git_assert_pushable()
+
+    (setup_py, name, old_version) = extract_info_from_setup()
+    new_version = bump_version(old_version, versionbump)
+    new_tag = f'v{new_version}'
+
+    (latest_release_commit, latest_release_version) = git_determine_latest_release()
+
+    git_assert_current_greater_than_latest(latest_release_version, new_version)
+
+    commits_since_last_release = git_commits_since(latest_release_commit, show=False)
+    if len(commits_since_last_release) == 0:
+        print('No new commits to release')
+        return
+
+    (remote, branch) = git_current_remote_branch()
+
+    def linebreak():
+        cli_width = shutil.get_terminal_size()[0]
+        line = '#' * (cli_width - 1)
+        line += '\r'
+        line += f'# {name} {new_version} '
+        line = f'\n{line}\n'
+        slowprint(line)
+
+    linebreak()
+
+    slowprint(f'Upgrading {name} from {old_version} --> {new_version}.')
+    slowprint()
+
+    if latest_release_commit:
+        slowprint('Latest release:')
+        git_show_commit(latest_release_commit)
+        slowprint()
+
+    slowprint('This release:')
+    git_commits_since(latest_release_commit, show=True)
+    slowprint()
+
+    setup_py = update_info_in_setup(setup_py, name, new_version)
+    slowprint('Rewrite setup.py:')
+    slowprint(textwrap.indent(setup_py, '>>> '))
+    slowprint()
+
+    slowprint(f'Release will be pushed to {remote} {branch}.')
+
+    linebreak()
+
+    input(f'PRESS ENTER TO RELEASE {name} {new_version}.')
+
+    write_setup(setup_py)
+
+    git_commit_bump(new_version)
+    if do_tag:
+        git_tag_version(new_tag)
+
+    git_push(remote, branch)
+    if do_tag:
+        git_push_tag(remote, new_tag)
+
+    did_stash = git_stash_push()
+    pypi_upload(name)
+    if did_stash:
+        git_stash_restore()
+
+    git_commits_since(latest_release_commit, show=True)
+
+def pypi_release_argparse(args):
+    global DEBUG
+    if args.debug:
+        DEBUG = True
+    versionbump = pick_versionbump(args.major, args.minor, args.patch)
+    try:
+        return pypi_release(do_tag=args.do_tag, versionbump=versionbump)
+    except subprocess.CalledProcessError as exc:
+        print(exc.output)
+        return 1
+
+def main(argv):
+    parser = argparse.ArgumentParser(description=__doc__)
+
+    parser.add_argument('--major', dest='major', action='store_true')
+    parser.add_argument('--minor', dest='minor', action='store_true')
+    parser.add_argument('--patch', dest='patch', action='store_true')
+    parser.add_argument('--do_tag', dest='do_tag', action='store_true')
+    parser.add_argument('--debug', dest='debug', action='store_true')
+    parser.set_defaults(func=pypi_release_argparse)
+
+    args = parser.parse_args(argv)
+    return args.func(args)
+
+if __name__ == '__main__':
+    raise SystemExit(main(sys.argv[1:]))