win7 x64系统中安装Scrapy的方法

c:\users\administrator>python
python 2.7.6 (default, nov 10 2013, 19:24:24) [msc v.1500 64 bit (amd64)] on win
32

#!/usr/bin/env python

"""
setuptools bootstrapping installer.

maintained at https://github.com/pypa/setuptools/tree/bootstrap.

run this script to install or upgrade setuptools.

this method is deprecated. check https://github.com/pypa/setuptools/issues/581 for more details.
"""

import os
import shutil
import sys
import tempfile
import zipfile
import optparse
import subprocess
import platform
import textwrap
import contextlib

from distutils import log

try:
 from urllib.request import urlopen
except importerror:
 from urllib2 import urlopen

try:
 from site import user_site
except importerror:
 user_site = none

# 33.1.1 is the last version that supports setuptools self upgrade/installation.
default_version = "33.1.1"
default_url = "https://pypi.io/packages/source/s/setuptools/"
default_save_dir = os.curdir
default_deprecation_message = "ez_setup.py is deprecated and when using it setuptools will be pinned to {0} since it's the last version that supports setuptools self upgrade/installation, check https://github.com/pypa/setuptools/issues/581 for more info; use pip to install setuptools"

meaningful_invalid_zip_err_msg = 'maybe {0} is corrupted, delete it and try again.'

log.warn(default_deprecation_message.format(default_version))


def _python_cmd(*args):
 """
 execute a command.

 return true if the command succeeded.
 """
 args = (sys.executable,) + args
 return subprocess.call(args) == 0


def _install(archive_filename, install_args=()):
 """install setuptools."""
 with archive_context(archive_filename):
 # installing
 log.warn('installing setuptools')
 if not _python_cmd('setup.py', 'install', *install_args):
  log.warn('something went wrong during the installation.')
  log.warn('see the error message above.')
  # exitcode will be 2
  return 2


def _build_egg(egg, archive_filename, to_dir):
 """build setuptools egg."""
 with archive_context(archive_filename):
 # building an egg
 log.warn('building a setuptools egg in %s', to_dir)
 _python_cmd('setup.py', '-q', 'bdist_egg', '--dist-dir', to_dir)
 # returning the result
 log.warn(egg)
 if not os.path.exists(egg):
 raise ioerror('could not build the egg.')


class contextualzipfile(zipfile.zipfile):

 """supplement zipfile class to support context manager for python 2.6."""

 def __enter__(self):
 return self

 def __exit__(self, type, value, traceback):
 self.close()

 def __new__(cls, *args, **kwargs):
 """construct a zipfile or contextualzipfile as appropriate."""
 if hasattr(zipfile.zipfile, '__exit__'):
  return zipfile.zipfile(*args, **kwargs)
 return super(contextualzipfile, cls).__new__(cls)


@contextlib.contextmanager
def archive_context(filename):
 """
 unzip filename to a temporary directory, set to the cwd.

 the unzipped target is cleaned up after.
 """
 tmpdir = tempfile.mkdtemp()
 log.warn('extracting in %s', tmpdir)
 old_wd = os.getcwd()
 try:
 os.chdir(tmpdir)
 try:
  with contextualzipfile(filename) as archive:
  archive.extractall()
 except zipfile.badzipfile as err:
  if not err.args:
  err.args = ('', )
  err.args = err.args + (
  meaningful_invalid_zip_err_msg.format(filename),
  )
  raise

 # going in the directory
 subdir = os.path.join(tmpdir, os.listdir(tmpdir)[0])
 os.chdir(subdir)
 log.warn('now working in %s', subdir)
 yield

 finally:
 os.chdir(old_wd)
 shutil.rmtree(tmpdir)


def _do_download(version, download_base, to_dir, download_delay):
 """download setuptools."""
 py_desig = 'py{sys.version_info[0]}.{sys.version_info[1]}'.format(sys=sys)
 tp = 'setuptools-{version}-{py_desig}.egg'
 egg = os.path.join(to_dir, tp.format(**locals()))
 if not os.path.exists(egg):
 archive = download_setuptools(version, download_base,
  to_dir, download_delay)
 _build_egg(egg, archive, to_dir)
 sys.path.insert(0, egg)

 # remove previously-imported pkg_resources if present (see
 # https://bitbucket.org/pypa/setuptools/pull-request/7/ for details).
 if 'pkg_resources' in sys.modules:
 _unload_pkg_resources()

 import setuptools
 setuptools.bootstrap_install_from = egg


def use_setuptools(
 version=default_version, download_base=default_url,
 to_dir=default_save_dir, download_delay=15):
 """
 ensure that a setuptools version is installed.

 return none. raise systemexit if the requested version
 or later cannot be installed.
 """
 to_dir = os.path.abspath(to_dir)

 # prior to importing, capture the module state for
 # representative modules.
 rep_modules = 'pkg_resources', 'setuptools'
 imported = set(sys.modules).intersection(rep_modules)

 try:
 import pkg_resources
 pkg_resources.require("setuptools>=" + version)
 # a suitable version is already installed
 return
 except importerror:
 # pkg_resources not available; setuptools is not installed; download
 pass
 except pkg_resources.distributionnotfound:
 # no version of setuptools was found; allow download
 pass
 except pkg_resources.versionconflict as vc_err:
 if imported:
  _conflict_bail(vc_err, version)

 # otherwise, unload pkg_resources to allow the downloaded version to
 # take precedence.
 del pkg_resources
 _unload_pkg_resources()

 return _do_download(version, download_base, to_dir, download_delay)


def _conflict_bail(vc_err, version):
 """
 setuptools was imported prior to invocation, so it is
 unsafe to unload it. bail out.
 """
 conflict_tmpl = textwrap.dedent("""
 the required version of setuptools (>={version}) is not available,
 and can't be installed while this script is running. please
 install a more recent version first, using
 'easy_install -u setuptools'.

 (currently using {vc_err.args[0]!r})
 """)
 msg = conflict_tmpl.format(**locals())
 sys.stderr.write(msg)
 sys.exit(2)


def _unload_pkg_resources():
 sys.meta_path = [
 importer
 for importer in sys.meta_path
 if importer.__class__.__module__ != 'pkg_resources.extern'
 ]
 del_modules = [
 name for name in sys.modules
 if name.startswith('pkg_resources')
 ]
 for mod_name in del_modules:
 del sys.modules[mod_name]


def _clean_check(cmd, target):
 """
 run the command to download target.

 if the command fails, clean up before re-raising the error.
 """
 try:
 subprocess.check_call(cmd)
 except subprocess.calledprocesserror:
 if os.access(target, os.f_ok):
  os.unlink(target)
 raise


def download_file_powershell(url, target):
 """
 download the file at url to target using powershell.

 powershell will validate trust.
 raise an exception if the command cannot complete.
 """
 target = os.path.abspath(target)
 ps_cmd = (
 "[system.net.webrequest]::defaultwebproxy.credentials = "
 "[system.net.credentialcache]::defaultcredentials; "
 '(new-object system.net.webclient).downloadfile("%(url)s", "%(target)s")'
 % locals()
 )
 cmd = [
 'powershell',
 '-command',
 ps_cmd,
 ]
 _clean_check(cmd, target)


def has_powershell():
 """determine if powershell is available."""
 if platform.system() != 'windows':
 return false
 cmd = ['powershell', '-command', 'echo test']
 with open(os.path.devnull, 'wb') as devnull:
 try:
  subprocess.check_call(cmd, stdout=devnull, stderr=devnull)
 except exception:
  return false
 return true
download_file_powershell.viable = has_powershell


def download_file_curl(url, target):
 cmd = ['curl', url, '--location', '--silent', '--output', target]
 _clean_check(cmd, target)


def has_curl():
 cmd = ['curl', '--version']
 with open(os.path.devnull, 'wb') as devnull:
 try:
  subprocess.check_call(cmd, stdout=devnull, stderr=devnull)
 except exception:
  return false
 return true
download_file_curl.viable = has_curl


def download_file_wget(url, target):
 cmd = ['wget', url, '--quiet', '--output-document', target]
 _clean_check(cmd, target)


def has_wget():
 cmd = ['wget', '--version']
 with open(os.path.devnull, 'wb') as devnull:
 try:
  subprocess.check_call(cmd, stdout=devnull, stderr=devnull)
 except exception:
  return false
 return true
download_file_wget.viable = has_wget


def download_file_insecure(url, target):
 """use python to download the file, without connection authentication."""
 src = urlopen(url)
 try:
 # read all the data in one block.
 data = src.read()
 finally:
 src.close()

 # write all the data in one block to avoid creating a partial file.
 with open(target, "wb") as dst:
 dst.write(data)
download_file_insecure.viable = lambda: true


def get_best_downloader():
 downloaders = (
 download_file_powershell,
 download_file_curl,
 download_file_wget,
 download_file_insecure,
 )
 viable_downloaders = (dl for dl in downloaders if dl.viable())
 return next(viable_downloaders, none)


def download_setuptools(
 version=default_version, download_base=default_url,
 to_dir=default_save_dir, delay=15,
 downloader_factory=get_best_downloader):
 """
 download setuptools from a specified location and return its filename.

 `version` should be a valid setuptools version number that is available
 as an sdist for download under the `download_base` url (which should end
 with a '/'). `to_dir` is the directory where the egg will be downloaded.
 `delay` is the number of seconds to pause before an actual download
 attempt.

 ``downloader_factory`` should be a function taking no arguments and
 returning a function for downloading a url to a target.
 """
 # making sure we use the absolute path
 to_dir = os.path.abspath(to_dir)
 zip_name = "setuptools-%s.zip" % version
 url = download_base + zip_name
 saveto = os.path.join(to_dir, zip_name)
 if not os.path.exists(saveto): # avoid repeated downloads
 log.warn("downloading %s", url)
 downloader = downloader_factory()
 downloader(url, saveto)
 return os.path.realpath(saveto)


def _build_install_args(options):
 """
 build the arguments to 'python setup.py install' on the setuptools package.

 returns list of command line arguments.
 """
 return ['--user'] if options.user_install else []


def _parse_args():
 """parse the command line for options."""
 parser = optparse.optionparser()
 parser.add_option(
 '--user', dest='user_install', action='store_true', default=false,
 help='install in user site package')
 parser.add_option(
 '--download-base', dest='download_base', metavar="url",
 default=default_url,
 help='alternative url from where to download the setuptools package')
 parser.add_option(
 '--insecure', dest='downloader_factory', action='store_const',
 const=lambda: download_file_insecure, default=get_best_downloader,
 help='use internal, non-validating downloader'
 )
 parser.add_option(
 '--version', help="specify which version to download",
 default=default_version,
 )
 parser.add_option(
 '--to-dir',
 help="directory to save (and re-use) package",
 default=default_save_dir,
 )
 options, args = parser.parse_args()
 # positional arguments are ignored
 return options


def _download_args(options):
 """return args for download_setuptools function from cmdline args."""
 return dict(
 version=options.version,
 download_base=options.download_base,
 downloader_factory=options.downloader_factory,
 to_dir=options.to_dir,
 )


def main():
 """install or upgrade setuptools and easyinstall."""
 options = _parse_args()
 archive = download_setuptools(**_download_args(options))
 return _install(archive, _build_install_args(options))

if __name__ == '__main__':
 sys.exit(main())

reload(sys)
sys.setdefaultencoding('gbk')