How to quickly re-deploy the same charm

[fengxia]

Hi Juju,

I'm testing a locally built charm using `localhost` (LXD) setup. 
Everytime `juju deploy` will take a good 5-10 minutes just to download 
and install python packages before the charm code runs.

I'm wondering what's a good practice to cut down this in dev iteration? 
So if I build a version 2 of the same charm, can I do `juju deploy 
my-charm` again to cause an update/upgrade, so to save the initial 
install time?

Any advice?

-- 
Feng xia
Engineer
Lenovo USA

Phone: 5088011794
fxia1 at lenovo.com
  	
Lenovo.com
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