sys module is simple to use

SYS Import 

# sys.path.append () # to add a path to the system environment variables 

print (sys.platform) # View the current system 
print (sys.version) # get python interpreter version of system 

# 
#### ######################################## 
# command-line startup file, can be used to verify 
Print (the sys.argv) 
# # you can receive a terminal (the shell) things behind, and becomes a list 
# # [ 'F:. \\ 1py \\ S10_sh \\ day \\ day16 \\ 06sys module. Py '] 

username = the sys.argv [. 1] 
pwd = the sys.argv [2] 

# cmd be registered in this way, 
IF username ==' CLY 'and pwd ==' 1234: ' 
    login print (' welcome ' ) 
the else: 
    Print ( 'login illegal')