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看到个讲copy的，转过来 import copy def custom_copy(a): c = a.copy() c[1] = a[1].copy() return c a = [ [1, 2], [3, 4] ] c1 = a c2 = copy.copy(a) # or: a.copy() list(a) a[:] c3 = custom_copy(a) c4 = copy.deepcopy(a) a[1].append(9999) print(f'{c1=}\n{c2=}\n{c3=}\n{c4=}')