copy deepcopy 赋值

import copy
a = [1, 2, ['a', 'b']]
b = a
c = copy.copy(a)
d = copy.deepcopy(a)
a.append(4)
a[2].append('c')

print('a = %s' % a)
print('b = %s' % b)
print('c = %s' % c)
print('d = %s' % d)



a = [1, 2, ['a', 'b', 'c'], 4]
b = [1, 2, ['a', 'b', 'c'], 4]
c = [1, 2, ['a', 'b', 'c']]
d = [1, 2, ['a', 'b']]