title: Python 2.7 Invalid syntax when running script from .csv file using pandas
body: <p>I am running a script with Python 2.7 using pandas to read from 2 csv files. I keep getting "invalid syntax" error messages, particularly on line 6 and 8. I can't figure out where is the problem, since line 6 is almost identical to line 5 and there I don't get any error. Thanks very much for your help !</p>
  
  <pre><code>import numpy as np
  import csv as csv
  import pandas as pd
  
  da = pd.read_csv('snp_rs.csv', index_col=(0,1), usecols=(0, 1), header=None,    converters = dict.fromkeys([0,1])
  db = pd.read_csv('chl.map.csv', index_col=(0,1), usecols=(0,1), header=None,    converters = dict.fromkeys([0,1])
  
  result = da.join(db, how='inner')
  x = result.to_csv('snp_rs_out.csv', header=None) # write as csv
  print x
  </code></pre>