CDAT Newsletter, June 2007
Document Actions
Type dictionary in python.
Goal: Learn about dictionaries
in
python.
A dictionary allows you to associate values index by keys. Dictionaries can be created using values in curly braces like this:
a = {
"name" : "CCM3",
"center" : "NCAR,"
"model_of" : "Atmosphere"
}
To access members of the dictionary, we use the key-indexing facility:model_name = a["model"]
modelling_center = a["center"]
The keys associated with a dictionary can be obtained as a list by:
b = a.keys()
You can check the dictionary
membership by using the has_key() method:
if a.has_key("model_of"):
print a["model_of"]
else:
print "Unknown model of"
NOTE:Dictionaries have no concept of order among elements. It is incorrect to say that the elements are “out of order”; they are simply unordered.
