Convert a pile of obvious "yes/no" functions to return bool.

Lib/tabnanny.py

@@ -196,7 +196,7 @@ class Whitespace:
                            other.indent_level(ts)) )
         return a
 
-    # Return true iff self.indent_level(t) < other.indent_level(t)
+    # Return True iff self.indent_level(t) < other.indent_level(t)
     # for all t >= 1.
     # The algorithm is due to Vincent Broman.
     # Easy to prove it's correct.
@@ -211,7 +211,7 @@ class Whitespace:
     # Note that M is of the form (T*)(S*) iff len(M.norm[0]) <= 1.
     def less(self, other):
         if self.n >= other.n:
-            return 0
+            return False
         if self.is_simple and other.is_simple:
             return self.nt <= other.nt
         n = max(self.longest_run_of_spaces(),
@@ -219,8 +219,8 @@ class Whitespace:
         # the self.n >= other.n test already did it for ts=1
         for ts in range(2, n+1):
             if self.indent_level(ts) >= other.indent_level(ts):
-                return 0
-        return 1
+                return False
+        return True
 
     # return a list of tuples (ts, i1, i2) such that
     # i1 == self.indent_level(ts) >= other.indent_level(ts) == i2.