[metro stations] Adding metro station phrase generator

scripts/geodata/addresses/metro_stations.py

@@ -0,0 +1,24 @@
+from geodata.addresses.config import address_config
+
+import random
+
+from geodata.addresses.config import address_config
+from geodata.addresses.numbering import NumericPhrase 
+from geodata.encoding import safe_decode
+
+
+class MetroStationPhrase(NumericPhrase):
+    key = 'metro_stations.alphanumeric'
+    dictionaries = ['qualifiers']
+
+
+class MetroStation(object):
+    @classmethod
+    def phrase(cls, station, language, country=None):
+        if station is None:
+            return None
+        phrase_prob = address_config.get_property('metro_stations.alphanumeric_phrase_probability', language, country=country, default=0.0)
+        if random.random() < phrase_prob:
+            return MetroStationPhrase.phrase(station, language, country=country)
+
+        return None