adict = dict() # {}
dict(['ab', 'cd'])
bdict = dict([('name', 'bob'),('age', 25)])
{}.fromkeys(['zhangsan', 'lisi', 'wangwu'], 11)
for key in bdict:
print('%s: %s' % (key, bdict[key]))
print("%(name)s: %(age)s" % bdict)
bdict['name'] = 'tom'
bdict['email'] = 'tom@tedu.cn'
del bdict['email']
bdict.pop('age')
bdict.clear()
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