title: How does Python split() function works
body: <pre><code>def loadTest(filename): 
      f=open(filename,'r')
      k=0
      line=f.readline()
      labels=[]
      vectors=[]
      while line and k&lt;4:
          k=k+1
          l=line[:-1].split(r'","')
          s=float(l[0][1:])
          tweet=l[5][:-1]
          print(l)
          line=f.readline()
       f.close()
       return
  </code></pre>
  
  <p>What do <code>split(r'","')</code> actually does inside python split method?</p>