windows系统下安装python的pip工具

第一步：首先创建一个py文件，命名为get-pip.py，代码如下（代码也可见附件）

import os.path
import pkgutil
import shutil
import sys
import struct
import tempfile

# Useful for very coarse version differentiation.
PY2 = sys.version_info[0] == 2
PY3 = sys.version_info[0] == 3

if PY3:
iterbytes = iter
else:
def iterbytes(buf):
return (ord(byte) for byte in buf)

try:
from base64 import b85decode
except ImportError:
_b85alphabet = (b"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
b"abcdefghijklmnopqrstuvwxyz!#$%&()*+-;<=>?@^_`{|}~")

def b85decode(b):
_b85dec = [None] * 256
for i, c in enumerate(iterbytes(_b85alphabet)):
_b85dec[c] = i

padding = (-len(b)) % 5
b = b + b'~' * padding
out = []
packI = struct.Struct('!I').pack
for i in range(0, len(b), 5):
chunk = b[i:i + 5]
acc = 0
try:
for c in iterbytes(chunk):
acc = acc * 85 + _b85dec[c]
except TypeError:
for j, c in enumerate(iterbytes(chunk)):
if _b85dec[c] is None:
raise ValueError(
'bad base85 character at position %d' % (i + j)
)
raise
try:
out.append(packI(acc))
except struct.error:
raise ValueError('base85 overflow in hunk starting at byte %d'
% i)

result = b''.join(out)
if padding:
result = result[:-padding]
return result

def bootstrap(tmpdir=None):
# Import pip so we can use it to install pip and maybe setuptools too
import pip
from pip.commands.install import InstallCommand
from pip.req import InstallRequirement

# Wrapper to provide default certificate with the lowest priority
class CertInstallCommand(InstallCommand):
def parse_args(self, args):
# If cert isn't specified in config or environment, we provide our
# own certificate through defaults.
# This allows user to specify custom cert anywhere one likes:
# config, environment variable or argv.
if not self.parser.get_default_values().cert:
self.parser.defaults["cert"] = cert_path # calculated below
return super(CertInstallCommand, self).parse_args(args)

pip.commands_dict["install"] = CertInstallCommand

implicit_pip = True
implicit_setuptools = True
implicit_wheel = True

# Check if the user has requested us not to install setuptools
if "--no-setuptools" in sys.argv or os.environ.get("PIP_NO_SETUPTOOLS"):
args = [x for x in sys.argv[1:] if x != "--no-setuptools"]
implicit_setuptools = False
else:
args = sys.argv[1:]

# Check if the user has requested us not to install wheel
if "--no-wheel" in args or os.environ.get("PIP_NO_WHEEL"):
args = [x for x in args if x != "--no-wheel"]
implicit_wheel = False

# We only want to implicitly install setuptools and wheel if they don't
# already exist on the target platform.
if implicit_setuptools:
try:
import setuptools # noqa
implicit_setuptools = False
except ImportError:
pass
if implicit_wheel:
try:
import wheel # noqa
implicit_wheel = False
except ImportError:
pass

# We want to support people passing things like 'pip<8' to get-pip.py which
# will let them install a specific version. However because of the dreaded
# DoubleRequirement error if any of the args look like they might be a
# specific for one of our packages, then we'll turn off the implicit
# install of them.
for arg in args:
try:
req = InstallRequirement.from_line(arg)
except:
continue

if implicit_pip and req.name == "pip":
implicit_pip = False
elif implicit_setuptools and req.name == "setuptools":
implicit_setuptools = False
elif implicit_wheel and req.name == "wheel":
implicit_wheel = False

# Add any implicit installations to the end of our args
if implicit_pip:
args += ["pip"]
if implicit_setuptools:
args += ["setuptools"]
if implicit_wheel:
args += ["wheel"]

delete_tmpdir = False
try:
# Create a temporary directory to act as a working directory if we were
# not given one.
if tmpdir is None:
tmpdir = tempfile.mkdtemp()
delete_tmpdir = True

# We need to extract the SSL certificates from requests so that they
# can be passed to --cert
cert_path = os.path.join(tmpdir, "cacert.pem")
with open(cert_path, "wb") as cert:
cert.write(pkgutil.get_data("pip._vendor.requests", "cacert.pem"))

# Execute the included pip and use it to install the latest pip and
# setuptools from PyPI
sys.exit(pip.main(["install", "--upgrade"] + args))
finally:
# Remove our temporary directory
if delete_tmpdir and tmpdir:
shutil.rmtree(tmpdir, ignore_errors=True)

def main():
tmpdir = None
try:
# Create a temporary working directory
tmpdir = tempfile.mkdtemp()

# Unpack the zipfile into the temporary directory
pip_zip = os.path.join(tmpdir, "pip.zip")
with open(pip_zip, "wb") as fp:
fp.write(b85decode(DATA.replace(b"\n", b"")))

# Add the zipfile to sys.path so that we can import it
sys.path.insert(0, pip_zip)

# Run the bootstrap
bootstrap(tmpdir=tmpdir)
finally:
# Clean up our temporary working directory
if tmpdir:
shutil.rmtree(tmpdir, ignore_errors=True)

DATA = b

if __name__ == "__main__":
main()

第二步：在windows系统下运行get-pip.py文件，稍等几分钟。就完成了安装。（安装成功的标志是在python的安装目录下生成了Scripts文件夹，如下图）

第三步：将python路径和pip的Scripts路径添加到系统环境变量的Path里。如下图：