Python Learning DAY07

Str.join () splicing with XX

List and dictionary re-circulation when the deletion will be omitted

Copy a new dictionary or a new list to delete with the new dictionary or the values in the new column table

The. Fromkeys () returns to the new dictionary without affecting the original list, and the added value is multiple key shares

Set Set

Unordered No Duplicates Hash

Most commonly used to remove heavy

itself can be deleted and changed to check

Can be changed into an immutable set set hash using. Frozenset ()

Depth copy

Assignment when two variables are used together with an object

Shallow copy

Copy only the surface layer or the common

. copy

or use an index

New value = copied value [index Start, end]

A deep copy of the bottom layer is re-created.

New file = copy,deepcopy (the file to be copied)

Python Learning DAY07