title: NameError: name '_name_' is not defined
body: <p>I have gone through the similar question in stackoverflow but couldn't find the answer close to my problem. In the code below the 3 line before the last line is giving Error -</p>
  
  <blockquote>
    <p><code>NameError: name '_name_' is not defined</code></p>
  </blockquote>
  
  <p>I have copied the below code from the University Lab guide instruction. Not really sure, how the code is working. We were just told to copy and paste for this lab and see the result. However, We have to type all the code into the command line and I am stuck. How could I fix this error in the code?</p>
  
  <pre><code>#!/usr/bin/python
  from mininet.topo import Topo
  from mininet.net import Mininet
  from mininet.util import dumpNodeConnections
  from mininet.log import setLogLevel
  class SingleSwitchTopo(Topo):
      “Single switch connected to n hosts.”
  def_init_(self,n=2,**opts):
  #initialize topology and default options
        Topo._init_(self,**opts)
        switch=self.addSwitch(‘s1’)
  #Python’s range(N) generates 0..N-1
        for h in range(n):
             host=self.addHost(‘h%s’%(h+1))
             self.addLink(host,switch)
  def simpleTest():
       “Create and test a simple network”
        topo=SingleSwitchTopo(n=4)
        net=Mininet(topo)
        net.start
        print “Dumping host connections”
        dumpNodeConnections(net.hosts)
        print “Testing network connectivity”
        net.pingAll()
       net.stop()
  if _name_==’_main_’:
       #Tell mininet to print useful information
       setLogLevel(‘info’)
       simpleTest()
  </code></pre>