Add code to unpack the Kiva data for Spark

unpack_kiva.py

@@ -0,0 +1,41 @@
+import zipfile
+import json
+import os
+
+kiva_folder = 'kiva-data/'
+
+def mkdirs():
+    os.mkdir(kiva_folder)
+    for f in map(lambda x: kiva_folder + x,
+                 ['loans', 'lenders', 'loans_lenders']):
+        if not os.path.isdir(f):
+            os.mkdir(f)
+
+
+def reformat_json(json_obj):
+    return json.dumps(json_obj, sort_keys=True, separators=(',', ':'))
+
+
+def unpack_kiva(filename="kiva_ds_json.zip"):
+    if not zipfile.is_zipfile(filename):
+        raise TypeError("Unable to unpack zip - Corrupted file?")
+
+    z = zipfile.ZipFile(filename)
+    names = z.namelist()
+    for json_name in filter(lambda x: 'json' in x, names):
+        try:
+            json_file = z.open(json_name)
+            json_string = json_file.read().decode('utf8')
+            json_obj = json.loads(json_string)
+            # Get `loan`, `lender`, etc.
+            obj_type = json_name.split('/')[0]
+            json_content = json_obj[obj_type]
+            formatted = [reformat_json(j) for j in json_content]
+            with open(kiva_folder + json_name, 'w+') as output:
+                output.write('\n'.join(formatted))
+        except json.JSONDecodeError:
+            print("Error decoding file {}".format(json_name))
+
+if __name__ == '__main__':
+    mkdirs()
+    unpack_kiva()