python:super(ClassName,self)._init_()的作用是什么?

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我有这样一个类:

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#!/usr/bin/env python
class Foo:
def __init__(self, x):
self.x = x
def bar(self):
self.bar1_out = self.x + 5
self.bar2_out = self.x + 1
return (self.bar1_out,self.bar2_out)
def qux(self,myvalue = None):
first, second = myvalue or self.bar()
return first + 3, second + 6

def main():
"""docstring for main"""
f = Foo(5)

mbr_out1, mbr_out2 = f.bar()
print mbr_out1,"\t", mbr_out2

mqx_out1, mqx_out2 = f.qux()
print mqx_out1,"\t", mqx_out2

qout1, qout2 = f.qux((1))
print qout1,"\t", qout2

if __name__ == '__main__':
main()

我看到一些实现建议使用super

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def __init__(self, x):
super(Foo,self).__init__()
self.x = x
def bar(self)
#etc.

我的问题是:

super(Foo,self).__init__()有什么用它与self.x=x有什么不同?如何让上面的代码使用super()生成相同的结果