1 # 判定指定元素在列表中是否存在
 2 print('p' in 'python')
 3 print('p' not in 'python')
 4 
 5 lst = [10, 20, 'python', 'hello']
 6 print(10 in lst)
 7 print(10 not in lst)
 8 print(100 in lst)
 9 print(100 not in lst)
10 
11 #列表元素的遍历
12 for item in lst:
13     print(item)