removed format since it does not make sense. Changed to force str and…

… repr to expand the iterable to produce expected output in python sessions

functional/chain.py

@@ -99,6 +99,7 @@ def __repr__(self):
 
         :return: sequence's repr
         """
+        self._expand_iterable()
         return repr(self.sequence)
 
     def __str__(self):
@@ -107,6 +108,7 @@ def __str__(self):
 
         :return: sequence's string
         """
+        self._expand_iterable()
         return str(self.sequence)
 
     def __unicode__(self):
@@ -117,15 +119,6 @@ def __unicode__(self):
         """
         return unicode(self.sequence)
 
-    def __format__(self, formatstr):
-        """
-        Format the sequence using formatstr and format()
-
-        :param formatstr: format passed to format()
-        :return: formatted string
-        """
-        return format(self.sequence, formatstr)
-
     def __nonzero__(self):
         """
         Returns True if size is not zero.