added invalid source-target exception

deep_translator/exceptions.py

@@ -36,6 +36,18 @@ class NotValidPayload(BaseError):
         super(NotValidPayload, self).__init__(val, message)
 
 
+class InvalidSourceOrTargetLanguage(BaseError):
+    """
+    exception thrown if the user enters an invalid payload
+    """
+
+    def __init__(self,
+                 val,
+                 message="source and target language can't be the same"):
+        super(InvalidSourceOrTargetLanguage, self).__init__(val, message)
+
+
+
 class TranslationNotFound(BaseError):
     """
     exception thrown if no translation was found for the text provided by the user

deep_translator/google_trans.py

@@ -173,3 +173,6 @@ class GoogleTranslator(BaseTranslator):
         return arr
 
 
+# if __name__ == '__main__':
+    # text = GoogleTranslator(source="en", target="en").translate("how are you")
+    # print(text)

deep_translator/parent.py

@@ -1,6 +1,6 @@
 """parent translator class"""
 
-from deep_translator.exceptions import NotValidPayload, NotValidLength
+from deep_translator.exceptions import NotValidPayload, NotValidLength, InvalidSourceOrTargetLanguage
 from abc import ABC, abstractmethod
 import string
 
@@ -21,6 +21,9 @@ class BaseTranslator(ABC):
         @param source: source language to translate from
         @param target: target language to translate to
         """
+        if source == target:
+            raise InvalidSourceOrTargetLanguage(source)
+
         self.__base_url = base_url
         self._source = source
         self._target = target