have a more trueish eof char (empty => False)

reader.py

@@ -47,14 +47,14 @@ def load(name, missing_ok=False):
             return T
         if missing_ok:
             return Nil
-        raise PyleFileNotFoundError(str(name), load=True)        
+        raise PyleFileNotFoundError(str(name), load=True)
     for dir in loadpath:
         result = load(os.path.join(dir, name), True)
         if result:
             return T
     if missing_ok:
         return Nil
-    raise PyleFileNotFoundError(str(name), load=True)        
+    raise PyleFileNotFoundError(str(name), load=True)
 
 def is_interactive(in_port, out_port):
     return in_port.isatty() and out_port and out_port.isatty()
@@ -215,7 +215,7 @@ class Reader():
                 line = input()
             except EOFError:
                 return False
-            line += "\n"            
+            line += "\n"
         else:
             line = self.inp.readline()
         self.currentLine = line
@@ -250,11 +250,11 @@ class Reader():
                     continue
                 else:
                     return ch
-                    
+
     def nextNonSpace(self):
         while True:
             ch = self.nextChar()
-            if ch == "" or not ch.isspace():
+            if not ch or not ch.isspace():
                 return ch
     def nextToken(self):
         if self.pushbacktoken:
@@ -263,7 +263,7 @@ class Reader():
             result = t
         else:
             ch = self.nextNonSpace()
-            if ch == "":
+            if not ch:
                 result = EOFToken()
             elif ch == "(":
                 result = OparenToken()