Common python built-in Methods

_ Init _ (self,...): Initialize the object and declare it before creating a new object.

_ Del _ (self): release an object, called before the object is deleted.

_ New _ (self, * args, ** ked): instance production operation

_ Str _ (self): called when the print statement is used

_ Delitem _ (self, key): deletes the elements corresponding to the key in the dictionary.

_ Setitem _ (self, key, value): assign values to keys in the dictionary.

_ Getitem _ (self, key): obtains the value corresponding to the index key of the sequence, which is equivalent to seq [key].

_ Len _ (self): called when the inline function len () is called.

_ Cmp _ (src, dst): Compares the src and dst objects.

_ Getattr _ (s, name): obtains the attribute value.

_ Setattr _ (s, name): sets the attribute value.

_ Gt _ (self, other): determines whether the self object is greater than the other object

_ Lt _ (self, other): determines whether the self object is smaller than the other object

_ Ge _ (self, other): determines whether the self object is not greater than the other object

_ Le _ (self, other): judge whether the self object is not smaller than the other object

_ Eq _ (self, other): determines whether the self object is equal to the other object

_ Call _ (self, * args): calls an instance object as a function.