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what is the difference between name and _name?

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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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what is the difference between name and _name? luofeiyu <elearn2014@gmail.com> - 2014-08-20 15:16 +0800
  Re: what is the difference between name and _name? Steven D'Aprano <steve@pearwood.info> - 2014-08-20 08:49 +0000
    Re: what is the difference between name and _name? luofeiyu <elearn2014@gmail.com> - 2014-08-20 19:41 +0800
      Re: what is the difference between name and _name? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-21 01:26 +1000
        Re: what is the difference between name and _name? luofeiyu <elearn2014@gmail.com> - 2014-08-21 10:20 +0800
        Re: what is the difference between name and _name? Chris Angelico <rosuav@gmail.com> - 2014-08-21 13:10 +1000
        Re: what is the difference between name and _name? luofeiyu <elearn2014@gmail.com> - 2014-08-22 14:37 +0800
    Re: what is the difference between name and _name? "Frank Millman" <frank@chagford.com> - 2014-08-20 14:18 +0200

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