The use of __getitem__, __setitem__, and __delitem__ in Python

Reference: Bole Address

Used for indexing operations, such as dictionaries. Each of these means getting, setting, deleting data

#Python __doc__
class C (object): "" "
    Holy shit What The fuck" "
    def __init__ (self):
        self.value = {}
        Self.name = ' Wupeiqi '

    def __getitem__ (self, item):
        print ' __getitem__ ', item return
        Self.value[item]

    def __setitem__ (self, Key, value):
        print ' __setitem__ ', key, value
        Self.value[key] = value

    def __delitem_ _ (Self, key):
        print ' __delitem__ ', key
        del Self.value[key]
    def __len__ (self): return
        Len ( Self.value)

print c.__doc__ c

= C ()
#print c
#result = c[' K1 ']
c[' k2 '] = 5
c[' k1 '] = " Hello "
print c[' K2"]
print len (c)