python字典复制演示代码
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
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