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Python dictionary 复制实现方法
时间：2022-11-14 23:00:35 编辑：袖梨 来源：一聚教程网
Python dictionary 复制实现方法
L = [1,2,3]
D = {'a':1, 'b':2}
A = L[:] # instead of: A = L (or list(L))
B = D.copy() # instead of: B = D
A[1] = 'Ni'
B['c'] = 'spam'
print L, D
print A, B
#The copy method returns a new dictionary with the same key-value pairs (a "shallow
#copy," since the values themselves are the same, not copies):
x = {'username': 'admin', 'machines': ['foo', 'bar', 'baz']}
y = x.copy()
y['username'] = 'mlh'
y['machines'].remove('bar')
print y
print x
from copy import deepcopy
d = {}
d['names'] = ['Alfred', 'Bertrand']
c = d.copy()
dc = deepcopy(d)
d['names'].append('Clive')
print c
print dc
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