python3安装setuptools步骤_Python3、setuptools、Pip3安装详解
博客核心内容：
1、Python3安装
2、setuptools安装
3、Pip3安装
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[root@iz2zea81ksgk8xh72ofrr0z tmp]# python3
Python 3.6.0a1 (default, Aug 19 2017, 14:53:46)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-11)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
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如果显示上面的内容，说明安装成功。
部分截图：
[root@iz2zea81ksgk8xh72ofrr0z software]# ll |grep setuptools-19.6
drwxr-xr-x 10 501 games 4096 Aug 19 17:34 setuptools-19.6
-rw-r--r-- 1 root root 641502 Jan 25 2016 setuptools-19.6.tar.gz
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3、进入setuptools-19.6编译安装
cd setuptools-19.6.tar.gz
python3 setup.py build
python3 setup.py install
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到这里如果你还没有报错的话，说明setuptools已经安装成功了，但是在这里我遇到了一个坑，当我执行python3 setup.py install时出现了错误，报错信息如下：
Compression requires the (missing) zlib module.
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出错原因：提示的很清楚，缺少 zlib模块导致安装失败
处理方式：
1、先安装缺少的模块（2行命令）
yum install zlib
yum install zlib-devel
2、下载zlib成功后， cd Python-3.6.0a1的目录，重新执行下面的这个命令：
make && make install
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3、重新进入setuptools-19.6目录，再次执行下面的命令：
python3 setup.py install
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到这里问题解决，setuptools-19.6安装成功.
[root@iz2zea81ksgk8xh72ofrr0z software]# ll |grep pip
drwxr-xr-x 7 501 games 4096 Aug 19 17:44 pip-8.0.2
-rw-r--r-- 1 root root 1130183 Aug 19 17:40 pip-8.0.2.tar.gz
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3、进入pip-8.0.2目录，编译安装：
cd pip-8.0.2
python3 setup.py build
python3 setup.py install
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到这里pip3就安装成功了，可以检查一下：
[root@iz2zea81ksgk8xh72ofrr0z software]# whereis pip3
pip3: /usr/local/bin/pip3 /usr/local/bin/pip3.6
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我当时到这里以为安装成功了，但是当执行pip3的时候，报错了，信息如下：
cannot import name HTTPSHandler.
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问题：提示的很清楚，缺少 HTTPSHandler模块导致安装失败
处理方式：
1、先安装缺少的模块（2行命令）
yum install openssl
yum install openssl-devel
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2、下载 HTTPSHandler成功后， cd Python-3.6.0a1的目录，重新执行下面的这个命令：
make && make install
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当我执行完上一行命令之后，出现了下面的日志（部分）
Ignoring indexes: https://pypi.python.org/simple
Collecting setuptools
Collecting pip
Installing collected packages: setuptools, pip
Found existing installation: setuptools 19.6
Uninstalling setuptools-19.6:
Successfully uninstalled setuptools-19.6
Found existing installation: pip 8.0.2
Uninstalling pip-8.0.2:
Successfully uninstalled pip-8.0.2
Successfully installed pip setuptools
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从最后一行Successfully installed pip setuptools可以看出，我的setuptools和pip随之跟着也成功了，验证一下：
[root@iz2zea81ksgk8xh72ofrr0z software]# pip3
Usage:
pip [options]
Commands:
install Install packages.
download Download packages.
uninstall Uninstall packages.
freeze Output installed packages in requirements format.
list List installed packages.
show Show information about installed packages.
search Search PyPI for packages.
wheel Build wheels from your requirements.
hash Compute hashes of package archives.
completion A helper command used for command completion
help Show help for commands.
General Options:
-h, --help Show help.
--isolated Run pip in an isolated mode, ignoring environment variables and user configuration.
-v, --verbose Give more output. Option is additive, and can be used up to 3 times.
-V, --version Show version and exit.
-q, --quiet Give less output.
--log Path to a verbose appending log.
--proxy Specify a proxy in the form [user:passwd@]proxy.server:port.
--retries Maximum number of retries each connection should attempt (default 5 times).
--timeout Set the socket timeout (default 15 seconds).
--exists-action Default action when a path already exists: (s)witch, (i)gnore, (w)ipe, (b)ackup.
--trusted-host Mark this host as trusted, even though it does not have valid or any HTTPS.
--cert Path to alternate CA bundle.
--client-cert Path to SSL client certificate, a single file containing the private key and the
certificate in PEM format.
--cache-dir
--no-cache-dir Disable the cache.
--disable-pip-version-check
Don't periodically check PyPI to determine whether a new version of pip is available for
download. Implied with --no-index.
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OK，大功告成！
总结一下注意的点，每次安装完缺少的模块之后，都需要：cd Python-3.6.0a1的目录，重新执行下面的这个命令：
make && make install