Revision&Refactoring (#431)

* Revision&Refactoring

* node.py: imports are reordered

* consts.BINARY_NAME__POSTGRES is added

Author: dmitry-lipetsk

src/consts.py

@@ -1,5 +1,8 @@
 # coding: utf-8
 
+# binary names
+BINARY_NAME__POSTGRES = "postgres"
+
 # names for dirs in base_dir
 DATA_DIR = "data"
 LOGS_DIR = "logs"

src/exceptions.py

@@ -113,7 +113,7 @@ class QueryTimeoutException(QueryException):
     def __init__(
         self,
         message: typing.Optional[str] = None,
-        query: typing.Optional[str] = None
+        query: typing.Optional[str] = None,
     ):
         assert message is None or type(message) is str
         assert query is None or type(query) is str
@@ -170,7 +170,7 @@ class StartNodeException(TestgresException):
     def __init__(
         self,
         message: typing.Optional[str] = None,
-        files: typing.Optional[typing.Iterable] = None
+        files: typing.Optional[typing.Iterable] = None,
     ):
         assert message is None or type(message) is str
         assert files is None or isinstance(files, typing.Iterable)