脚本安装Python3.7.3

"""
Centos7 自动编译安装Python3.7.3
命令:
  python37
  pip37
"""
import os
# 可执行的平台
os_platform = ["Centos7"]

def color_red(context):
    """红色"""
    return '\033[1;31;40m{}\033[0m'.format(context)

def color_green(context):
    """绿色"""
    return '\033[1;32;40m{}\033[0m'.format(context)

def os_install_dependence(os_name="Centos7"):
    if "Centos7" in os_platform:
        print(color_green("正在安装依赖包"))
        res = os.system("yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make libffi-devel zlib* openssl-devel -y")
        return res 
        # 如果执行成功，会返回0
    else:
        msg = color_red("脚本在不支持 {} 中Python的安装".format(os_name))
        print(msg)
        return -1

def os_install_python():
    print(color_green("正在解压Python.tgz..."))
    package_name = "Python-3.7.3"
    cmd_unzip = 'tar xf ' + package_name+ '.tgz'
    res_unzip = os.system(cmd_unzip)
    if res_unzip !=  0:
        print("Python-3.7.3.tgz 解压失败")
        return -1
    cmd_python = 'cd '+ package_name+ ' && ./configure --prefix=/usr/local/python37 && make && make install'
    print(color_green("正在编译安装python3.7.3..."))
    res_python = os.system(cmd_python)

    # 注释掉，这里和预期不符
    #if cmd_python != 0:
    #    print("编译安装失败，请检查是否缺少依赖")
    #    return -1
  
def check_isinstall():
    print(color_green("正在检查环境..."))
    return os.path.exists("/usr/local/python37")

def create_link():
    print(color_green("正在创建软链接..."))
    cmd = "ln -s /usr/local/python37/bin/python3 /usr/bin/python37"
    os.system(cmd)
    cmd = "ln -s /usr/local/python37/bin/pip3 /usr/bin/pip37"
    os.system(cmd)

def clear_trash():
    print(color_green("正在清理残余垃圾..."))
    cmd = "rm -rf ./Python-3.7.3"
    os.system(cmd)

def main():
    if check_isinstall():
        print("/usr/local/python37 已存在")
        return
    else:
        res_dep = os_install_dependence()
        res_python= os_install_python()
    create_link()
    clear_trash()

if __name__ == "__main__":
    main()