make mypy happy

relational/optimizations.py

@@ -1,5 +1,5 @@
 # Relational
-# Copyright (C) 2009-2016  Salvo "LtWorf" Tomaselli
+# Copyright (C) 2009-2017  Salvo "LtWorf" Tomaselli
 #
 # Relational is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by

relational/parser.py

@@ -1,5 +1,5 @@
 # Relational
-# Copyright (C) 2008-2016  Salvo "LtWorf" Tomaselli
+# Copyright (C) 2008-2017  Salvo "LtWorf" Tomaselli
 #
 # Relational is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -24,6 +24,8 @@
 #
 # Language definition here:
 # http://ltworf.github.io/relational/grammar.html
+from typing import Optional
+
 from relational import rtypes
 
 RELATION = 0
@@ -100,8 +102,8 @@ class Node (object):
     operation.
 
     This class is used to convert an expression into python code.'''
-    kind = None
-    __hash__ = None
+    kind = None #  type: Optional[int]
+    __hash__ = None #  type: None
 
     def __init__(self, expression=None):
         '''Generates the tree from the tokenized expression

relational/relation.py

@@ -1,5 +1,5 @@
 # Relational
-# Copyright (C) 2008-2016  Salvo "LtWorf" Tomaselli
+# Copyright (C) 2008-2017  Salvo "LtWorf" Tomaselli
 #
 # Relational is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -50,7 +50,7 @@ class Relation (object):
     An empty relation needs a header, and can be filled using the insert()
     method.
     '''
-    __hash__ = None
+    __hash__ = None #  type: None
 
     def __init__(self, filename=""):
         self._readonly = False

relational/rtypes.py

@@ -57,7 +57,7 @@ class Rstring (str):
                 self._autocast = rdate(self)
         return self._autocast
 
-    def isInt(self):
+    def isInt(self) -> bool:
         '''Returns true if the string represents an int number
         it only considers as int numbers the strings matching
         the following regexp:
@@ -65,7 +65,7 @@ class Rstring (str):
         '''
         return Rstring.int_regexp.match(self) is not None
 
-    def isFloat(self):
+    def isFloat(self) -> bool:
         '''Returns true if the string represents a float number
         it only considers as float numbers, the strings matching
         the following regexp:
@@ -73,7 +73,7 @@ class Rstring (str):
         '''
         return Rstring.float_regexp.match(self) is not None
 
-    def isDate(self):
+    def isDate(self) -> bool:
         '''Returns true if the string represents a date,
         in the format YYYY-MM-DD. as separators '-' , '\', '/' are allowed.
         As side-effect, the date object will be stored for future usage, so
@@ -159,7 +159,7 @@ class Rdate (object):
         return (self.intdate - other.intdate).days
 
 
-def is_valid_relation_name(name):
+def is_valid_relation_name(name: str) -> bool:
     '''Checks if a name is valid for a relation.
     Returns boolean'''
     return re.match(RELATION_NAME_REGEXP, name) != None and not keyword.iskeyword(name)