I am a bit puzzled by the following code:
d = {'x': 1, 'y': 2, 'z': 3}
for key in d:
print key, 'corresponds to', d[key]
What I don't understand is the key
portion. How does Python recognize that it needs only to read the key from the dictionary? Is key
a special word in Python? Or is it simply a variable?
转载于:https://stackoverflow.com/questions/3294889/iterating-over-dictionaries-using-for-loops