Greetings,
: I am having a problem with a small application I am writing. I
: have to have the user input the key, then have the program output
: the value associated with it. A way to inform the user that the
: key they entered is not in the dictionary or somefing would be
: nice also.
I would agree also with Emile--in the future, you will probably get
a better answer if you are more specific in your question. This one
is a pretty easy question to answer and show you some samples for
how to approach this with code snippets.
I will assume that userinput is a variable with the contents of
interest that your user typed. I will use the variable d to
represent some dictionary (any dictionary).
if userinput in d:
print 'Found', userinput, 'in dictionary, value was', d[userinput]
else:
print 'No entry'
Depending on what else you are doing (besides printing), you might
also look into the get() method of dictionaries:
default = '<nonexistent>'
string_to_print = d.get(userinput,default)
print 'You typed %s. The entry was %s.' % ( userinput, string_to_print)
These are pretty common usage patterns for dictionaries, so you
might benefit from looking at the other sorts of things that you can
do with dictionaries.
Good luck,
-Martin
--
Martin A. Brown
http://linux-ip.net/
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