how to copy emails into local directory?

[luofeiyu]

import imaplib,email
user="xxxx"
password="yyyy"
con=imaplib.IMAP4_SSL('imap.gmail.com')
con.login(user,password)
con.list()
('OK', [b'(\\HasNoChildren) "/" "INBOX"', b'(\\Noselect \\HasChildren) 
"/" "[Gma
il]"', b'(\\HasNoChildren \\Junk) "/" "[Gmail]/&V4NXPpCuTvY-"', 
b'(\\HasNoChildr
en \\Trash) "/" "[Gmail]/&XfJSIJZkkK5O9g-"', b'(\\HasNoChildren 
\\Flagged) "/" "
[Gmail]/&XfJSoGYfaAc-"', b'(\\HasNoChildren \\Sent) "/" 
"[Gmail]/&XfJT0ZCuTvY-"'
, b'(\\HasNoChildren \\All) "/" "[Gmail]/&YkBnCZCuTvY-"', 
b'(\\HasNoChildren \\D
rafts) "/" "[Gmail]/&g0l6Pw-"', b'(\\HasNoChildren \\Important) "/" 
"[Gmail]/&kc
2JgQ-"'])

Now, i want to  copy all the emails in the gmailbox of
"[Gmail]/&kc2JgQ-"  (the important mailbox in my gmail"
into local directory  "g:\emails",how can i do that in python code?