What are the advantages and disadvantages of python string resident mechanism

This article will explain in detail the advantages and disadvantages of the python string residence mechanism. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

1. Advantages, when you need a string of the same value, you can use it directly from the string pool.

Avoid frequent creation and destruction, improve efficiency, and save memory, as concatenating and modifying strings can affect performance.

2, disadvantages, when you need to concatenate strings, it is recommended to use the str type join method instead of +, because join is to first calculate the length of all characters and then copy, only the new object once, the efficiency is higher than "+".

Example

# the method of case conversion in a string s = 'hello, python'a = s.upper () # after conversion to uppercase, a new string object print (a, id (a)) # HELLO, PYTHON 2468875240944print (sdepartment id (s)) # hello, python 2468875240752b = s.lower () # is generated after conversion Will generate a new string object print (b, id (b)) # hello, python 2468875239600print (s, id (s)) # hello, python 2468875240752print (b = = s) # Trueprint (b is s) # False on "what are the advantages and disadvantages of python string resident mechanism?" this article ends here. I hope the above content can be helpful to you, so that you can learn more knowledge, if you think the article is good. Please share it for more people to see.