019sys模块

为了和python解释器交互，控制台执行脚本后面添加变量

import  sys
print(sys.argv)

def  post():
    print('upload')
def  download():
    print('download')
if  sys.argv[1] == 'post':
    post()
elif  sys.argv[1] == 'download':
    download()

sys.exit(n)   # 退出程序，0为正常

print(sys.path) # python使用模块的路径   ['F:\python_code\fullstack_s2\week4\day18','F:\python_code\fullstack_s2','F:\python_code\fullstack_s2\week2','D:\ProgramFiles\python36\python36.zip','D:\ProgramFiles\python36\DLLs','D:\ProgramFiles\python36\lib','D:\ProgramFiles\python36','D:\ProgramFiles\python36\lib\site-packages','D:\ProgramFiles\JetBrains\PyCharm2017.3\helpers\pycharm_matplotlib_backend']

print(sys.platform)     #  win32   查看平台
sys.stdout.write('#####')        # 标准输出