redhat7.3安装python3 pip3

首先系统自带的python是python2

我们需要安装一个python3（这里的所有源码包都可以在环境中准备好，这样没有网也可以进行安装）

安装python

1.安装环境

# yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-develreadline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel sqlite-devel

2.下载包

 wget https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tgz

3.解压包

 tar -zxvf Python-3.6.1.tgz

4.创建安装目录，进入解压后的包，制定安装路径进行安装

mkdir -p /usr/local/python3

cd Python-3.6.1

./configure --prefix=/usr/local/python3

报错
[root@bogon Python-3.6.1]# ./configure --prefix=/usr/local/python3
checking build system type... x86_64-unknown-linux-gnu
checking host system type... x86_64-unknown-linux-gnu
checking for python3.6... no
checking for python3... no
checking for python... python
checking for --enable-universalsdk... no
checking for --with-universal-archs... no
checking MACHDEP... linux
checking for --without-gcc... no
checking for --with-icc... no
checking for gcc... no
checking for cc... no
checking for cl.exe... no
configure: error: in `/usr/local/src/Python-3.6.1':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details

由于本机缺少gcc编译环境

1、通过yum安装gcc编译环境：yum install -y gcc

5.编译安装

make && make install

6.创建软连接

ln -s /usr/local/python3/bin/python3  /usr/bin/python3

ln -s  /usr/local/python3/bin/pip3   /usr/bin/pip3

这样在命令行中输入python代表python2，输入python3代表python3

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./pip3 install --upgrade setuptools pip

python默认的pip版本和setuptools版本比较旧，如果有网，可以在线更新，下面记录一下离线更新

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安装pip3

1.首先安装setuptools（安装到python3里，安装完成后可以删除源码包）

wget --no-check-certificate  https://pypi.python.org/packages/source/s/setuptools/setuptools-40.6.2.zip#md5=c607dd118eae682c44ed146367a17e26

unzip  setuptools-40.6.2.zip

cd setuptools-40.6.2
python3 setup.py build 
python3 setup.py install

2.安装pip3

wget --no-check-certificate  https://pypi.python.org/packages/source/p/pip/pip-18.1.tar.gz#md5=3a73c4188f8dbad6a1e6f6d44d117eeb

tar -zxvf pip-18.1.tar.gz cd pip-8.0.2 python3 setup.py build python3 setup.py install

3.安装完成之后我们再来看下python的bin目录下都有什么东西吧，发现有pip

创建软连接

ln -s /usr/local/python3/bin/pip  /usr/bin/pip