Revised the code for PEP8.

mia_core/models.py

@@ -79,7 +79,8 @@ class User(models.Model):
     visits = models.PositiveSmallIntegerField(null=True)
     visited_at = models.DateTimeField(null=True, db_column="visited")
     visited_ip = models.GenericIPAddressField(null=True, db_column="ip")
-    visited_host = models.CharField(max_length=128, null=True, db_column="host")
+    visited_host = models.CharField(
+        max_length=128, null=True, db_column="host")
     visited_country = models.ForeignKey(
         Country, on_delete=models.PROTECT, null=True,
         db_column="ct", to_field="code", related_name="users")

mia_core/period.py

@@ -81,8 +81,7 @@ class Period:
     _data_start = None
     _data_end = None
 
-    def __init__(
-            self, spec = None, data_start = None, data_end = None):
+    def __init__(self, spec=None, data_start=None, data_end=None):
         self._period = self.Parser(spec)
         self._data_start = data_start
         self._data_end = data_end

mia_core/utils.py

@@ -466,6 +466,7 @@ class SqlQuery:
     """
     sql = ""
     params = []
+
     def __init__(self, sql, params):
         self.sql = sql
         self.params = params