title: User defined input csv file
body: <p>I some lines of code that read a csv file in a certain format. What I'd like now (and couldn't figure out a solution for) is that the file name stops being stale and becomes an actual user input when calling the python program. Now I have a static file name in the code, eg: </p>
  
  <pre><code>reader = csv.reader(open("file.csv", "rb"))
  </code></pre>
  
  <p>I'd like this to become an information provided by the user. Is this done using raw_input or is there a way to do it by having the user writing something in the lines of:</p>
  
  <pre><code>python testfile.py --input:file.csv
  </code></pre>
  
  <p>Appreciate your help in advance!</p>