title: name 'split' is not defined issue
body: <p>I have this code snippet that do some basic calculation on two text files. 
  My code:</p>
  
  <pre><code>with open('one.txt', 'r') as one, open('two.txt', 'r') as two:
      next(two) # skip first line in two.txt
      for line_one, line_two in zip(one, two):
          one_a = int(split(line_one, ",")[0])
          two_b = int(split(line_two, " ")[1])
          print(one_a - two_b)
  </code></pre>
  
  <p>I am getting the following error:</p>
  
  <pre><code>Traceback (most recent call last):
    File "test.py", line 4, in &lt;module&gt;
      one_a = split(line_one, ",")[0]
  NameError: name 'split' is not defined
  </code></pre>
  
  <p>I have no idea why, help would be much appreciated!</p>