When i learn property in python , i was confused by somename and _somename,what 
is the difference between them?

class Person(object):
    def __init__(self, name):
        self._name = name
    def getName(self):
        print('fetch....')
        return self._name
    def setName(self, value):
        print('change...')
        self._name = value
    def delName(self):
        print('remove....')
        del self._name
    name = property(getName, setName, delName, "name property docs")


bob._name
'Bob'
pt=Person("peter")
pt.name
fetch....
'peter'
pt._name
'peter'
pt.name="tom"
change...
pt._name="tom"
pt._name
'tom'
pt.name
fetch....
'tom'

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