title: ARIMA seasonal prediction with Python: x12a and x13as not found on path
body: <p>I am using Statsmodels to implement seasonal ARIMA prediction for time series. Here is my code :</p>
  
  <pre><code>import statsmodels.api  as sm
  from statsmodels.tsa.x13 import x13_arima_select_order, _find_x12
  import pandas
  import scipy
  import numpy
  import imp
  data_source = imp.load_source('data_source', '/mypath/')
  def main():
      data=data_source.getdata()
      res = x13_arima_select_order(data)
      print (res.order, res.sorder)
  
  main()
  </code></pre>
  
  <p>When running the code, I am getting this exception:</p>
  
  <p>X13NotFoundError("x12a and x13as not found on path. Give the "
  statsmodels.tools.sm_exceptions.X13NotFoundError: x12a and x13as not found on path. Give the path, put them on PATH, or set the X12PATH or X13PATH environmental variable.</p>