I'm sure this is a classic beginner's topic, and I've read a bit about it 
online already, but I'd like to ask about it here as well.  I want to assign 
names to objects based on what a user inputs so that I can later keep track of 
them. 

In particular, I want to time multiple events by getting each of their start 
times and later comparing them to their respective stop times--I don't want to 
user timers.  In order to do this, I need to give each start time a name 
associated with the name of the event.  If there is an "event A" it's start 
time could be eventA_start, whereas event B could be called eventB_start, i.e.:

eventA_start = datetime.datetime.now() 

The problem is, I don't know the "A" part...the user could choose eventPotato 
or eventDinosaur.  I won't know in advance.  I want the name chosen/inputted by 
the user to be attached to the name for the time that event started.

I have read that the way to do this properly in Python is with use of 
dictionaries, but I haven't found a reference online that shows how to do it is 
in a complete way.  Any help is appreciated.

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