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Dictionaries and Loops |
To obtain a list of the keys in a dictionary, use the keys() function. keys() can be used with the for statement to process each element of the dictionary in turn:
idlist = {"Smith,Mary":"P12345", "Doe,John":"P12346",
"Jones,Charlie":"P12347", "Public,John":"P12348",
"Dobbs,Cindy":"P12349"}
for name in idlist.keys():
patientid = idlist[name]
print name, "has Patient ID", patientid
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When you run this code, the output is similar to this:
Smith,Mary has Patient ID P12345 Jones,Charlie has Patient ID P12347 Public,John has Patient ID P12348 Dobbs,Cindy has Patient ID P12349 Doe,John has Patient ID P12346 |
Note that the elements of the dictionary are displayed in no particular order. To sort the keys in alphabetical order, use sort():
idlist = {"Smith,Mary":"P12345", "Doe,John":"P12346",
"Jones,Charlie":"P12347", "Public,John":"P12348",
"Dobbs,Cindy":"P12349"}
sortedkeys = idlist.keys()
sortedkeys.sort()
for name in sortedkeys:
patientid = idlist[name]
print name, "has Patient ID", patientid
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