王捷恩

1. str1="123212"
   
2. str2="abc"
   
3. print("position of 2 in string 1：",str1.index('2'))
   
4. print("how many 2s are there in string 1：",str1.count('2'))
   
5. print("string 1 contains 3：",'3' in str1)
   
6. print("string 1 contains 5：",'5' in str1)
   
7. print("string 1 does not contain 5",'5' not in str1)
   
8. str1+=str2
   
9. print("concatenate str1 and str2：",str1)
   
10. str2*=3
    
11. print("copy the content of string 2 3 times：",str2)

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