def compare_vectors(x, y):
    for x_i, y_i in zip(x, y):
        comparison = _compare(x_i, y_i)
        if comparison == 0:
            continue
        else:
            return comparison
    return 0


def _compare(x, y):
    if x is not None and y is not None:
        return int(x > y) - int(x < y)
    elif x is not None and y is None:
        return -1
    elif x is None and y is not None:
        return 1
    else:
        return 0


class ConstantDict(dict):
    def __init__(self, constant):
        super(ConstantDict, self).__init__()
        self.constant = constant

    def values(self):
        return [self.constant]

    def __delitem__(self, key):
        try:
            super(ConstantDict, self).__delitem__(key)
        except KeyError:
            pass

    def __eq__(self, other):
        if type(other) is not type(self):
            return False
        elif other.constant == self.constant:
            return True
        else:
            return False

    def __getitem__(self, item):
        try:
            return super(ConstantDict, self).__getitem__(item)
        except KeyError:
            return self.constant

    def __repr__(self):
        return 'ConstantDict({})'.format(self.constant)

def compare_vectors(x, y):
    for x_i, y_i in zip(x, y):
        comparison = _compare(x_i, y_i)
        if comparison == 0:
            continue
        else:
            return comparison
    return 0


def _compare(x, y):
    if x is not None and y is not None:
        return int(x > y) - int(x < y)
    elif x is not None and y is None:
        return -1
    elif x is None and y is not None:
        return 1
    else:
        return 0


class ConstantDict(dict):
    def __init__(self, constant):
        super(ConstantDict, self).__init__()
        self.constant = constant
        self.deleted_keys = set()

    def update(self, E=None, **F):
        super(ConstantDict, self).update(E, **F)

        if type(E) is type(self):
            self.constant = E.constant

    def values(self):
        return [self.constant] + list(super(ConstantDict, self).values())

    def __delitem__(self, key):
        try:
            super(ConstantDict, self).__delitem__(key)
        except KeyError:
            self.deleted_keys.add(key)

    def __eq__(self, other):
        if type(other) is not type(self):
            return False
        elif other.constant == self.constant and super(ConstantDict, self).__eq__(other):
            return True
        else:
            return False

    def __getitem__(self, item):
        try:
            return super(ConstantDict, self).__getitem__(item)
        except KeyError:
            if item in self.deleted_keys:
                raise
            else:
                return self.constant

    def __repr__(self):
        return 'ConstantDict({}, {})'.format(self.constant, super(ConstantDict, self).__repr__())

Fix bugs in new class
Fix bugs in new class

  def compare_vectors(x, y):
      for x_i, y_i in zip(x, y):
          comparison = _compare(x_i, y_i)
          if comparison == 0:
              continue
          else:
              return comparison
      return 0
  
  
  def _compare(x, y):
      if x is not None and y is not None:
          return int(x > y) - int(x < y)
      elif x is not None and y is None:
          return -1
      elif x is None and y is not None:
          return 1
      else:
          return 0
  
  
  class ConstantDict(dict):
      def __init__(self, constant):
          super(ConstantDict, self).__init__()
          self.constant = constant
+         self.deleted_keys = set()
+ 
+     def update(self, E=None, **F):
+         super(ConstantDict, self).update(E, **F)
+ 
+         if type(E) is type(self):
+             self.constant = E.constant
  
      def values(self):
-         return [self.constant]
+         return [self.constant] + list(super(ConstantDict, self).values())
  
      def __delitem__(self, key):
          try:
              super(ConstantDict, self).__delitem__(key)
          except KeyError:
-             pass
+             self.deleted_keys.add(key)
  
      def __eq__(self, other):
          if type(other) is not type(self):
              return False
-         elif other.constant == self.constant:
+         elif other.constant == self.constant and super(ConstantDict, self).__eq__(other):
              return True
          else:
              return False
  
      def __getitem__(self, item):
          try:
              return super(ConstantDict, self).__getitem__(item)
          except KeyError:
+             if item in self.deleted_keys:
+                 raise
+             else:
-             return self.constant
+                 return self.constant
  
      def __repr__(self):
-         return 'ConstantDict({})'.format(self.constant)
+         return 'ConstantDict({}, {})'.format(self.constant, super(ConstantDict, self).__repr__())
  
Fix bugs in new class
## Code Before:
def compare_vectors(x, y):
    for x_i, y_i in zip(x, y):
        comparison = _compare(x_i, y_i)
        if comparison == 0:
            continue
        else:
            return comparison
    return 0


def _compare(x, y):
    if x is not None and y is not None:
        return int(x > y) - int(x < y)
    elif x is not None and y is None:
        return -1
    elif x is None and y is not None:
        return 1
    else:
        return 0


class ConstantDict(dict):
    def __init__(self, constant):
        super(ConstantDict, self).__init__()
        self.constant = constant

    def values(self):
        return [self.constant]

    def __delitem__(self, key):
        try:
            super(ConstantDict, self).__delitem__(key)
        except KeyError:
            pass

    def __eq__(self, other):
        if type(other) is not type(self):
            return False
        elif other.constant == self.constant:
            return True
        else:
            return False

    def __getitem__(self, item):
        try:
            return super(ConstantDict, self).__getitem__(item)
        except KeyError:
            return self.constant

    def __repr__(self):
        return 'ConstantDict({})'.format(self.constant)

## Instruction:
Fix bugs in new class
## Code After:
def compare_vectors(x, y):
    for x_i, y_i in zip(x, y):
        comparison = _compare(x_i, y_i)
        if comparison == 0:
            continue
        else:
            return comparison
    return 0


def _compare(x, y):
    if x is not None and y is not None:
        return int(x > y) - int(x < y)
    elif x is not None and y is None:
        return -1
    elif x is None and y is not None:
        return 1
    else:
        return 0


class ConstantDict(dict):
    def __init__(self, constant):
        super(ConstantDict, self).__init__()
        self.constant = constant
        self.deleted_keys = set()

    def update(self, E=None, **F):
        super(ConstantDict, self).update(E, **F)

        if type(E) is type(self):
            self.constant = E.constant

    def values(self):
        return [self.constant] + list(super(ConstantDict, self).values())

    def __delitem__(self, key):
        try:
            super(ConstantDict, self).__delitem__(key)
        except KeyError:
            self.deleted_keys.add(key)

    def __eq__(self, other):
        if type(other) is not type(self):
            return False
        elif other.constant == self.constant and super(ConstantDict, self).__eq__(other):
            return True
        else:
            return False

    def __getitem__(self, item):
        try:
            return super(ConstantDict, self).__getitem__(item)
        except KeyError:
            if item in self.deleted_keys:
                raise
            else:
                return self.constant

    def __repr__(self):
        return 'ConstantDict({}, {})'.format(self.constant, super(ConstantDict, self).__repr__())
