python学习手册-ch1 to ch4
D = {'a': 1, 'b': 2, 'c': 3}
print(list(D.keys()))
for key in D:
print(key, '=>', D[key])
f = ['a', 'f']
for key in f:
if(not key in D):
print('missing', key)
if(key in D):
print(D[key])
D = {'a': 1, 'b': 2, 'c': 3}
p...
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