5 files changed, 24 insertions, 24 deletions

diff --git a/vk/tracking/db/__init__.py b/vk/tracking/db/__init__.py
index 51b1a7c..7095cf3 100644
--- a/vk/tracking/db/__init__.py
+++ b/vk/tracking/db/__init__.py
@@ -5,4 +5,4 @@
 
 from .format import Format
 
-__all__ = ('format',)
+__all__ = ("format",)
diff --git a/vk/tracking/db/backend/__init__.py b/vk/tracking/db/backend/__init__.py
index 0d3153f..8a1a7d7 100644
--- a/vk/tracking/db/backend/__init__.py
+++ b/vk/tracking/db/backend/__init__.py
@@ -6,7 +6,7 @@
 from . import csv, log, null
 
 __all__ = (
-    'csv',
-    'log',
-    'null',
+    "csv",
+    "log",
+    "null",
 )
diff --git a/vk/tracking/db/backend/log.py b/vk/tracking/db/backend/log.py
index 0ffee5c..6f3ebaa 100644
--- a/vk/tracking/db/backend/log.py
+++ b/vk/tracking/db/backend/log.py
@@ -15,7 +15,7 @@ class Writer(meta.Writer):
         handler = logging.StreamHandler(fd)
         handler.setFormatter(
             logging.Formatter(
-                fmt='[%(asctime)s] %(message)s', datefmt='%Y-%m-%d %H:%M:%S%z'
+                fmt="[%(asctime)s] %(message)s", datefmt="%Y-%m-%d %H:%M:%S%z"
             )
         )
         self._logger.addHandler(handler)
@@ -71,24 +71,24 @@ class Writer(meta.Writer):
 
     @staticmethod
     def _format_user_is_online(user):
-        return f'{user.full_name} is ONLINE.'
+        return f"{user.full_name} is ONLINE."
 
     @staticmethod
     def _format_user_is_offline(user):
-        return f'{user.full_name} is OFFLINE.'
+        return f"{user.full_name} is OFFLINE."
 
     @staticmethod
     def _format_user_last_seen(user):
-        return f'{user.full_name} was last seen at {user.last_seen.time_local} using {user.last_seen.platform.descr}.'
+        return f"{user.full_name} was last seen at {user.last_seen.time_local} using {user.last_seen.platform.descr}."
 
     @staticmethod
     def _format_user_went_online(user):
-        return f'{user.full_name} went ONLINE.'
+        return f"{user.full_name} went ONLINE."
 
     @staticmethod
     def _format_user_went_offline(user):
-        return f'{user.full_name} went OFFLINE.'
+        return f"{user.full_name} went OFFLINE."
 
     @staticmethod
     def _format_another_connection_error(e):
-        return f'Encountered a connection error which looks like the previous one: {e}'
+        return f"Encountered a connection error which looks like the previous one: {e}"
diff --git a/vk/tracking/db/format.py b/vk/tracking/db/format.py
index 5c88cb7..66d9132 100644
--- a/vk/tracking/db/format.py
+++ b/vk/tracking/db/format.py
@@ -12,9 +12,9 @@ from . import backend
 
 
 class Format(Enum):
-    CSV = 'csv'
-    LOG = 'log'
-    NULL = 'null'
+    CSV = "csv"
+    LOG = "log"
+    NULL = "null"
 
     def __str__(self):
         return self.value
@@ -26,7 +26,7 @@ class Format(Enum):
             return backend.log.Writer(fd)
         if self is Format.NULL:
             return backend.null.Writer()
-        raise NotImplementedError(f'unsupported database format: {self}')
+        raise NotImplementedError(f"unsupported database format: {self}")
 
     def open_output_file(self, path=None):
         if self is Format.CSV:
@@ -35,30 +35,30 @@ class Format(Enum):
             return self._open_output_log_file(path)
         if self is Format.NULL:
             return self._open_output_database_file(None)
-        raise NotImplementedError('unsupported database format: ' + str(self))
+        raise NotImplementedError("unsupported database format: " + str(self))
 
     @staticmethod
     def _open_output_log_file(path):
-        return io.open_output_text_file(path, mode='a')
+        return io.open_output_text_file(path, mode="a")
 
     @staticmethod
     def _open_output_database_file(path):
-        return io.open_output_text_file(path, mode='x')
+        return io.open_output_text_file(path, mode="x")
 
     def create_reader(self, fd=sys.stdin):
         if self is Format.CSV:
             return backend.csv.Reader(fd)
         if self is Format.LOG:
-            return NotImplementedError('cannot read from a log file')
+            return NotImplementedError("cannot read from a log file")
         if self is Format.NULL:
             return backend.null.Reader()
-        raise NotImplementedError('unsupported database format: ' + str(self))
+        raise NotImplementedError("unsupported database format: " + str(self))
 
     def open_input_file(self, path=None):
         if self is Format.CSV:
             return io.open_input_text_file(path)
         if self is Format.LOG:
-            raise NotImplementedError('cannot read from a log file')
+            raise NotImplementedError("cannot read from a log file")
         if self is Format.NULL:
             return io.open_input_text_file(None)
-        raise NotImplementedError('unsupported database format: ' + str(self))
+        raise NotImplementedError("unsupported database format: " + str(self))
diff --git a/vk/tracking/db/timestamp.py b/vk/tracking/db/timestamp.py
index 4a3892f..c9ed293 100644
--- a/vk/tracking/db/timestamp.py
+++ b/vk/tracking/db/timestamp.py
@@ -30,7 +30,7 @@ class Timestamp:
 
     @staticmethod
     def from_string(s):
-        return Timestamp(datetime.strptime(s, '%Y-%m-%dT%H:%M:%SZ'))
+        return Timestamp(datetime.strptime(s, "%Y-%m-%dT%H:%M:%SZ"))
 
     def __str__(self):
-        return f'{self.dt.isoformat()}Z'
+        return f"{self.dt.isoformat()}Z"