原文： Check Python site-packages for Updates
译者： youngsterxyf
刚才，我找到一个美妙的短小脚本 check_for_updates.py ，它使用PIP来为本地已安装的Python包检查更新。然而，在Python 3环境下无法工作，所以我就把它移植过来了：
"""
Use pip to get a list of local packages to check against one or more package
indexes for updated versions.
"""
try:
from cStringIO import StringIO
import xmlrpclib
except ImportError:
from io import StringIO
import xmlrpc.client as xmlrpclib
from distutils.version import StrictVersion, LooseVersion
import sys
import pip
def get_local_packages():
"""
Call pip's freeze -l
returns a list of package_name, version tuples
"""
sys.stdout = mystdout = StringIO()
pip.main(['freeze', '-l'])
sys.stdout = sys.__stdout__
pkgs = mystdout.getvalue().split('\n')
return [p.split('==') for p in pkgs]
def find_current_version(package, index_urls=None):
"""
Using the XMLRPC method available for PyPI, get the most recent version
of <package> from each of the index_urls and figure out which one (if any)
is higher
Returns a tuple of the index with the higher version and the version it has
"""
if index_urls is None:
index_urls = ['http://pypi.python.org/pypi']
cur_version = '0'
cur_index = ''
for index_url in index_urls:
pypi = xmlrpclib.ServerProxy(index_url, xmlrpclib.Transport())
pypi_hits = pypi.package_releases(package)
if len(pypi_hits) > 0:
if compare_versions(pypi_hits[0], cur_version):
cur_version = pypi_hits[0]
cur_index = index_url
return cur_index, cur_version
def compare_versions(version1, version2):
"""
Compare 2 versions, starting with StrictVersion, and falling back on
LooseVersion. Returns ``True`` if *version1* is greater than *version2*.
"""
try:
return StrictVersion(version1) > StrictVersion(version2)
# in case of abnormal version number, fall back to LooseVersion
except ValueError:
return LooseVersion(version1) > LooseVersion(version2)
def output_line(pkg_name, new_version, old_version, index_url):
"""Output the line showing the formatted information."""
msg = '%(bd)s%(pkg_name)s%(nm)s (%(new)s) via %(index)s. Currently %(old)s.'
params = {
'bd': BOLD,
'nm': NORMAL,
'pkg_name': pkg_name,
'new': new_version,
'old': old_version,
'index': index_url,
}
print(msg % params)
NEWER = lambda x, y: compare_versions(str(x), y) == 1
if __name__ == '__main__':
import curses
curses.setupterm()
CLEAR_SCREEN = curses.tigetstr('clear').decode('utf-8')
BOLD = curses.tigetstr('bold').decode('utf-8')
NORMAL = curses.tigetstr('sgr0').decode('utf-8')
if len(sys.argv) > 1:
indexes = sys.argv[1:]
else:
indexes = ['http://pypi.python.org/pypi']
print(CLEAR_SCREEN + BOLD + 'Packages with newer versions:' + NORMAL)
print('')
for pkg in get_local_packages():
# pip outputs a single 0 at the end of the list. Ignore it.
if len(pkg) < 2:
continue
index, current_version = find_current_version(pkg[0], index_urls=indexes)
if current_version and NEWER(str(current_version), pkg[1]):
output_line(pkg[0], current_version, pkg[1], index)
可以随便在哪使用某个Python解释器来执行这个脚本(例如，python3 check_for_updates.py或者在一个virtualenv环境中运行)，如果你想为这个Python解释器检查其程序包的更新信息。然后，你就可以使用 pip install -U <packagename> (对于Python 3则是pip-3.2)来更新程序包。
更新 ： yolk 程序包可以通过 yolk -U 来完成上述脚本同样的事情，只是它不支持Python 3。我就在想PIP什么时候能包含这个功能。