身份運算符：is , is not
成員運算符：in , not in
1.深淺拷貝
s = [‘nihao ‘, 2]
s1 = s.copy()
print(s1)
print(s,s1)
<1>淺拷貝(只會copy第一層次)
b=a[:] #b=a.copy()
-------------------------------
s = [[1, 2], ‘nihao‘, 2]
d = s
print(id(s))
print(id(d))
#32285040
#32285040
-------------------------------
s = [[1, 2], ‘nihao‘, 2]
d = s.copy()
print(id(s))
print(id(d))
#6726000
#6797272
<2>s深拷貝（克隆一份）

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