class Transliterator(object):

    def __init__(self, mapping, invert=False):
        self.mapping = [
            (v, k) if invert else (k, v)
            for k, v in mapping.items()
        ]

        self._rules = sorted(
            self.mapping,
            key=lambda item: len(item[0]),
            reverse=True,
        )

    @property
    def rules(self):
        for r in self._rules:
            yield r

            # Handle the case when one source upper char is represented by
            # several latin chars, all uppercase. i.e. "CH" instead of "Ch"
            k, v = r
            if len(k) > 1 and k[0].isupper():
                yield (k.upper(), v.upper())

    def convert(self, input_string):
        """Transliterate input string."""
        for (source_char, translit_char) in self.rules:
            input_string = input_string.replace(source_char, translit_char)

        return input_string

class Transliterator(object):

    def __init__(self, mapping, invert=False):
        self.mapping = [
            (v, k) if invert else (k, v)
            for k, v in mapping.items()
        ]

        self._rules = sorted(
            self.mapping,
            key=lambda item: len(item[0]),
            reverse=True,
        )

    @property
    def rules(self):
        for r in self._rules:
            k, v = r
            if len(k) == 0:
                continue  # for case when char is removed and mapping inverted

            yield r

            # Handle the case when one source upper char is represented by
            # several latin chars, all uppercase. i.e. "CH" instead of "Ch"
            if len(k) > 1 and k[0].isupper():
                yield (k.upper(), v.upper())

    def convert(self, input_string):
        """Transliterate input string."""
        for (source_char, translit_char) in self.rules:
            input_string = input_string.replace(source_char, translit_char)

        return input_string

Handle case when char is mapped to empty (removed) and table is inverted
Handle case when char is mapped to empty (removed) and table is inverted

  class Transliterator(object):
  
      def __init__(self, mapping, invert=False):
          self.mapping = [
              (v, k) if invert else (k, v)
              for k, v in mapping.items()
          ]
  
          self._rules = sorted(
              self.mapping,
              key=lambda item: len(item[0]),
              reverse=True,
          )
  
      @property
      def rules(self):
          for r in self._rules:
+             k, v = r
+             if len(k) == 0:
+                 continue  # for case when char is removed and mapping inverted
+ 
              yield r
  
              # Handle the case when one source upper char is represented by
              # several latin chars, all uppercase. i.e. "CH" instead of "Ch"
-             k, v = r
              if len(k) > 1 and k[0].isupper():
                  yield (k.upper(), v.upper())
  
      def convert(self, input_string):
          """Transliterate input string."""
          for (source_char, translit_char) in self.rules:
              input_string = input_string.replace(source_char, translit_char)
  
          return input_string
  
Handle case when char is mapped to empty (removed) and table is inverted
## Code Before:
class Transliterator(object):

    def __init__(self, mapping, invert=False):
        self.mapping = [
            (v, k) if invert else (k, v)
            for k, v in mapping.items()
        ]

        self._rules = sorted(
            self.mapping,
            key=lambda item: len(item[0]),
            reverse=True,
        )

    @property
    def rules(self):
        for r in self._rules:
            yield r

            # Handle the case when one source upper char is represented by
            # several latin chars, all uppercase. i.e. "CH" instead of "Ch"
            k, v = r
            if len(k) > 1 and k[0].isupper():
                yield (k.upper(), v.upper())

    def convert(self, input_string):
        """Transliterate input string."""
        for (source_char, translit_char) in self.rules:
            input_string = input_string.replace(source_char, translit_char)

        return input_string

## Instruction:
Handle case when char is mapped to empty (removed) and table is inverted
## Code After:
class Transliterator(object):

    def __init__(self, mapping, invert=False):
        self.mapping = [
            (v, k) if invert else (k, v)
            for k, v in mapping.items()
        ]

        self._rules = sorted(
            self.mapping,
            key=lambda item: len(item[0]),
            reverse=True,
        )

    @property
    def rules(self):
        for r in self._rules:
            k, v = r
            if len(k) == 0:
                continue  # for case when char is removed and mapping inverted

            yield r

            # Handle the case when one source upper char is represented by
            # several latin chars, all uppercase. i.e. "CH" instead of "Ch"
            if len(k) > 1 and k[0].isupper():
                yield (k.upper(), v.upper())

    def convert(self, input_string):
        """Transliterate input string."""
        for (source_char, translit_char) in self.rules:
            input_string = input_string.replace(source_char, translit_char)

        return input_string
