Fix python3 can not send file by string bug.

bug #40

telebot/apihelper.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 
 import requests
-
+from six import string_types
 import telebot
 from telebot import types
 
@@ -88,7 +88,7 @@ def send_photo(token, chat_id, photo, caption=None, reply_to_message_id=None, re
     method_url = r'sendPhoto'
     payload = {'chat_id': chat_id}
     files = None
-    if isinstance(photo, file):
+    if not is_string(photo):
         files = {'photo': photo}
     else:
         payload['photo'] = photo
@@ -121,7 +121,7 @@ def send_data(token, chat_id, data, data_type, reply_to_message_id=None, reply_m
     method_url = get_method_by_type(data_type)
     payload = {'chat_id': chat_id}
     files = None
-    if isinstance(data, file):
+    if not is_string(data):
         files = {data_type: data}
     else:
         payload[data_type] = data
@@ -149,10 +149,15 @@ def _convert_markup(markup):
     return markup
 
 
+def is_string(var):
+    return isinstance(var, string_types)
+
+
 class ApiException(Exception):
     """
     This class represents an Exception thrown when a call to the Telegram API fails.
     """
+
     def __init__(self, function_name, result):
         super(ApiException, self).__init__('{0} failed. Returned result: {1}'.format(function_name, result))
         self.function_name = function_name

tests/test_telebot.py

@@ -4,6 +4,7 @@ import time
 
 sys.path.append('../')
 from telebot import types
+from telebot import apihelper
 import telebot
 
 
@@ -37,3 +38,17 @@ def create_text_message(text):
     params['text'] = text
     return types.Message(1, None, None, 1, 'text', params)
 
+
+def test_is_string_unicode():
+    s1 = u'string'
+    assert apihelper.is_string(s1)
+
+
+def test_is_string_string():
+    s1 = 'string'
+    assert apihelper.is_string(s1)
+
+
+def test_not_string():
+    i1 = 10
+    assert not apihelper.is_string(i1)