Python Basics: Shades of a copy

For numeric, string-deep copies:

Import Copynum = 0copy_num = copy.copy (num) print ("These is normal copy"). Center ("*") Print (Num,id (num)) print (Copy_ Num,id (Copy_num)) print ("These is deep copy"). Center (*, ' * ') Deep_copy_num = copy.deepcopy (num) print (Num,id (num)) Print (Deep_copy_num,id (deep_copy_num)) *******************these is normal copy******************** (0, 3910788) # Original num ID (0, 3910788) #浅拷贝 Id********************these is deep copy********************* (0, 3910788) #原num ID (0, 3910788) # Deep Copy ID

For dictionaries, tuples, and list-depth copies:

Import copydic = {"CPU": [+,], "IO": [+,], "Disk": [+,], "Memory": [+,],}copy_dic = copy.copy (DIC) copy_d ic["CPU"][0]=30print ("These is normal copy"). Center ("*") Print (Dic,id (DIC)) print (Copy_dic,id (copy_dic)) print (" These is deep copy "). Center (' * ') Deepcopy_dic = Copy.deepcopy (DIC) deepcopy_dic[" CPU "][0]=40print (Dic,id (DIC)) Print (Deepcopy_dic,id (deepcopy_dic)) *******************these is normal copy******************** ({' Disk ': [70], ' CPU ': [+], ' io ': [[], ' memory ': []}, 39905584) #原dic ID ({' Disk ': [], ' CPU ': [+], ' io ': [], ' memory ': [70]}, 39 906736) #浅拷贝 Id********************these is deep copy********************* ({' Disk ': [[], ' CPU ': [+], ' IO ': [+], ' Me ' Mory ': [[]}, 39905584) #原dic ID ({' Disk ': [[], ' CPU ': [+], ' IO ': [], ' Memory ': []}, 39907168) #深拷贝 ID

As you can see, assignments, shallow copies, and deep copies are meaningless for numbers and strings because they always point to the same memory address.

For dictionaries, Ganso, and lists, the changes in the memory address of the assignment, the shallow copy, and the deep copy are different.

Assignment, just create a variable that points to the original memory address.

Python Basics: Shades of a copy