# add a new element to orignal 1D list a
import copy
a = [1, 2]
b = a
c = a.copy()
d = a[:]
e = list(a)
f = copy.copy(a)
g = copy.deepcopy(a)
print("add a new element to orignal 1D list a")
a.append(3)
print("original a = ", a)
print("assign b = ", b)
print("built-in c = ", c)
print("slice d = ", d)
print("list() e = ", e)
print("copy.copy() f = ", f)
print("copy.deepcopy() g = ", g)
# add a new element to orignal 1D list a
# original a = [1, 2, 3]
# assign b = [1, 2, 3]
# built-in c = [1, 2]
# slice d = [1, 2]
# list() e = [1, 2]
# copy.copy() f = [1, 2]
# copy.deepcopy() g = [1, 2]
# change first element in original 1D list a
import copy
print("change first element in original 1D list a")
a = [1, 2]
b = a
c = a.copy()
d = a[:]
e = list(a)
f = copy.copy(a)
g = copy.deepcopy(a)
a[0] = 5
print("original a = ", a)
print("assign b = ", b)
print("built-in c = ", c)
print("slice d = ", d)
print("list() e = ", e)
print("copy.copy() f = ", f)
print("copy.deepcopy() g = ", g)
# change first element in original 1D list a
# original a = [5, 2]
# assign b = [5, 2]
# built-in c = [1, 2]
# slice d = [1, 2]
# list() e = [1, 2]
# copy.copy() f = [1, 2]
# copy.deepcopy() g = [1, 2]
# add a new element to orignal 2D list a
import copy
a = [[1, 2], [3, 4]]
b = a # 终生绑定
c = a.copy() #暂时绑定
d = a[:] # 一维 deepcopy 二维 shallow copy
e = list(a)
f = copy.copy(a)
g = copy.deepcopy(a)
print("add a new element to orignal 2D list a")
print("idx_a:",id(a))
print("idx_d:",id(d))
a.append([5, 6])
a[0][1] = 999
print("idx_a:",id(a))
print("idx_d:",id(d))
print("original a = ", a)
print("assign b = ", b)
print("built-in c = ", c)
print("slice d = ", d)
print("list() e = ", e)
print("copy.copy() f = ", f)
print("copy.deepcopy() g = ", g)
# add a new element to orignal 2D list a
# original a = [[1, 2], [3, 4], [5, 6]]
# assign b = [[1, 2], [3, 4], [5, 6]]
# built-in c = [[1, 2], [3, 4]]
# slice d = [[1, 2], [3, 4]]
# list() e = [[1, 2], [3, 4]]
# copy.copy() f = [[1, 2], [3, 4]]
# copy.deepcopy() g = [[1, 2], [3, 4]]
# add a new element to orignal 2D list a
# idx_a: 140448613644544
# idx_d: 140448613505216
# idx_a: 140448613644544
# idx_d: 140448613505216
# original a = [[1, 999], [3, 4], [5, 6]]
# assign b = [[1, 999], [3, 4], [5, 6]]
# built-in c = [[1, 999], [3, 4]]
# slice d = [[1, 999], [3, 4]]
# list() e = [[1, 999], [3, 4]]
# copy.copy() f = [[1, 999], [3, 4]]
# copy.deepcopy() g = [[1, 2], [3, 4]]
# change first element in original 2D list a
print("change first element in original 2D list a")
a = [[1, 2], [3, 4]]
b = a
c = a.copy()
d = a[:]
e = list(a)
f = copy.copy(a)
g = copy.deepcopy(a)
print("idx_a:",id(a))
print("idx_d:",id(d))
a[0][0] = 5
print("idx_a:",id(a))
print("idx_d:",id(d))
print("original a = ", a)
print("assign b = ", b)
print("built-in c = ", c)
print("slice d = ", d)
print("list() e = ", e)
print("copy.copy() f = ", f)
print("copy.deepcopy() g = ", g)
# original a = [[5, 2], [3, 4]]
# assign b = [[5, 2], [3, 4]]
# built-in c = [[5, 2], [3, 4]]
# slice d = [[5, 2], [3, 4]]
# list() e = [[5, 2], [3, 4]]
# copy.copy() f = [[5, 2], [3, 4]]
# copy.deepcopy() g = [[1, 2], [3, 4]]
疑问：list赋值和append操作会造成不一样的结果？
