add example data to repository instead of downloading it from external ever

The external solver will be offline due to technical problems so it
might be better not be reliant on external servers.

Author: uvchik

example/basic_example.py

@@ -3,8 +3,6 @@
 
 import pandas as pd
 import logging
-import os
-import requests
 
 try:
     from matplotlib import pyplot as plt
@@ -40,37 +38,14 @@
     'wind_conv_type': 'VESTAS V 90 3000'}
 
 
-def download_file(filename, url):
-    if not os.path.isfile(filename):
-        logging.info('Copying weather data from {0} to {1}'.format(
-            url, filename))
-        req = requests.get(url)
-        with open(filename, 'wb') as fout:
-            fout.write(req.content)
-
-def fetch_example_files():
-    basic_path = os.path.join(os.path.expanduser("~"), '.oemof')
-    filename_1 = os.path.join(basic_path, 'weather.csv')
-    url1 = 'http://vernetzen.uni-flensburg.de/~git/weather.csv'
-    filename_2 = os.path.join(basic_path, 'weather_wittenberg.csv')
-    url2 = 'http://vernetzen.uni-flensburg.de/~git/weather_wittenberg.csv'
-    if not os.path.exists(basic_path):
-        os.makedirs(basic_path)
-    download_file(filename_1, url1)
-    download_file(filename_2, url2)
-    return filename_1, filename_2
-
-
 def ready_example_data(filename, datetime_column='Unnamed: 0'):
     df = pd.read_csv(filename)
     return df.set_index(pd.to_datetime(df[datetime_column])).tz_localize(
         'UTC').tz_convert('Europe/Berlin').drop(datetime_column, 1)
 
 
-filename1, filename2 = fetch_example_files()
-
 # Loading weather data
-weather_df = ready_example_data(filename1)
+weather_df = ready_example_data('weather.csv')
 
 e126 = basicmodel.SimpleWindTurbine(**enerconE126)
 v90 = basicmodel.SimpleWindTurbine(**vestasV90)