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')