Add typing to FUNCTION symbol

Author: boriel

symbols/function.py

@@ -8,6 +8,7 @@
 # This program is Free Software and is released under the terms of
 #                    the GNU General License
 # ----------------------------------------------------------------------
+from typing import Optional
 
 from api.constants import CLASS
 from api.constants import KIND
@@ -52,13 +53,13 @@ def set_kind(self, value, lineno):
         self.__kind = value
 
     @property
-    def params(self):
+    def params(self) -> SymbolPARAMLIST:
         if not self.children:
             return SymbolPARAMLIST()
         return self.children[0]
 
     @params.setter
-    def params(self, value):
+    def params(self, value: SymbolPARAMLIST):
         assert isinstance(value, SymbolPARAMLIST)
         if self.children is None:
             self.children = []
@@ -69,14 +70,14 @@ def params(self, value):
             self.children = [value]
 
     @property
-    def body(self):
+    def body(self) -> SymbolBLOCK:
         if not self.children or len(self.children) < 2:
             self.body = SymbolBLOCK()
 
         return self.children[1]
 
     @body.setter
-    def body(self, value):
+    def body(self, value: Optional[SymbolBLOCK]):
         if value is None:
             value = SymbolBLOCK()
         assert isinstance(value, SymbolBLOCK)