diff --git a/googletrans/client.py b/googletrans/client.py
index 7cf470c..2b2bb4d 100644
--- a/googletrans/client.py
+++ b/googletrans/client.py
@@ -33,21 +33,24 @@ class Translator(object):
             pass
 
     def _translate(self, text, dest='en', src='auto'):
-        if src != 'auto' and src not in LANGUAGES.keys() and src in SPECIAL_CASES.keys():
-            src = SPECIAL_CASES[src]
-        elif src != 'auto' and src not in LANGUAGES.keys():
-            raise ValueError('invalid source language')
+        if src != 'auto':
+            if src not in LANGUAGES.keys() and src in SPECIAL_CASES.keys():
+                src = SPECIAL_CASES[src]
+            elif src not in LANGUAGES.keys():
+                raise ValueError('invalid source language')
 
-        if dest not in LANGUAGES.keys() and dest in SPECIAL_CASES.keys():
-            dest = SPECIAL_CASES[dest]
-        elif dest not in LANGUAGES.keys():
-            raise ValueError('invalid destination language')
+        if dest not in LANGUAGES.keys():
+            if dest in SPECIAL_CASES.keys():
+                dest = SPECIAL_CASES[dest]
+            else:
+                raise ValueError('invalid destination language')
 
         if not PY3 and isinstance(text, str):  # pragma: nocover
             text = text.decode('utf-8')
 
         token = self.token_acquirer.do(text)
-        params = utils.build_params(query=text, src=src, dest=dest, token=token)
+        params = utils.build_params(query=text, src=src, dest=dest,
+                                    token=token)
         r = self.session.get(urls.TRANSLATE, params=params)
 
         data = utils.format_json(r.text)
diff --git a/googletrans/gtoken.py b/googletrans/gtoken.py
index c8c89a4..b651044 100644
--- a/googletrans/gtoken.py
+++ b/googletrans/gtoken.py
@@ -39,7 +39,8 @@ class TokenAcquirer(object):
         950629.577246
     """
 
-    RE_TKK = re.compile(r'TKK=eval\(\'\(\(function\(\)\{(.+?)\}\)\(\)\)\'\);', re.DOTALL)
+    RE_TKK = re.compile(r'TKK=eval\(\'\(\(function\(\)\{(.+?)\}\)\(\)\)\'\);',
+                        re.DOTALL)
 
     def __init__(self, tkk='0', session=None):
         self.session = session or requests.Session()
@@ -96,7 +97,8 @@ class TokenAcquirer(object):
                     elif isinstance(node, ast.BitXor):  # pragma: nocover
                         operator = '^'
             # a safety way to avoid Exceptions
-            clause = compile('{1}{0}{2}'.format(operator, keys['a'], keys['b']), '', 'eval')
+            clause = compile('{1}{0}{2}'.format(
+                operator, keys['a'], keys['b']), '', 'eval')
             value = eval(clause, dict(__builtin__={}))
             result = '{}.{}'.format(n, value)
 
@@ -150,7 +152,8 @@ class TokenAcquirer(object):
             elif l < 2048:
                 e.append(l >> 6 | 192)
             # append calculated value if l matches special condition
-            elif (l & 64512) == 55296 and g + 1 < size and ord(text[g + 1]) & 64512 == 56320:
+            elif (l & 64512) == 55296 and g + 1 < size and \
+                    ord(text[g + 1]) & 64512 == 56320:
                 g += 1
                 l = 65536 + ((l & 1023) << 10) + ord(text[g]) & 1023
                 e.append(l >> 18 | 240)