在centos7下安装python3

在https://www.python.org/ftp/python/中选择自己需要的python源码包，我下载的是python3.7.0

• 下载

  wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tgz

• 解压

  tar zxvf Python-3.7.0.tgz

• 安装

  cd Python-3.7.0
  ./configure --prefix=/usr/local/python3
  make && make install

  安装完成没有提示错误便安装成功了

• 建立软连接

  ln -s /usr/local/python3/bin/python3.7 /usr/bin/python3
  ln -s /usr/local/python3/bin/pip3.7 /usr/bin/pip3

• 测试

  python3 --version

• 卸载python

  sudo rm -fr /usr/local/python3
  sudo rm -fr /usr/bin/python3
  sudo rm -fr /usr/bin/pip3

• ssl错误

  Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host=’pypi.org’, port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError(“Can’t connect to HTTPS URL because the SSL module is not available.”)) - skipping

1. 安装openssl

   yum -y install openssl

2. 卸载python和pip

3. 重新安装python

• 升级pip

  curl https://bootstrap.pypa.io/get-pip.py | python