Python youtube | Python Fiddle

from Google_ import Create_Service
import re
from pprint import pprint
from googleapiclient import errors

class YouTube:
    def __init__(self, client_secret_file, scopes: list = None):
        self.client_secret_file = client_secret_file
        self.scopes = scopes

def construct_service_instance(self):
        try:
        #    API_NAME = 'youtube'
        #    API_VERSION = 'v3'
            service = Create_Service(self.client_secret_file, 'youtube', 'v3', self.scopes)
            return service
        except Exception as e:
            print(e)
            return 'No service'

@staticmethod
    def get_channel_videos_detail(service, channel_id):
        response = service.channels().list(
            part='contentDetails',
            id=channel_id
        ).execute()

if response['pageInfo']['totalResults'] == 0:
            print('Channel not found')
            return ''
        else:
            uploaded_playlist_id = response.get('items')[0]['contentDetails']['relatedPlaylists']['uploads']
            # print(response)
            # return uploaded_playlist_id
            try:
                response_playlist_items = service.playlistItems().list(
                    part='contentDetails',
                    playlistId=uploaded_playlist_id,
                    maxResults=50,
                )

playlistItems = response_playlist_items['items']
                nextPageToken = response_playlist_items.get('nextPageToken')

while nextPageToken:
                    response_playlist_items = service.playlistItems().list(
                        part='contentDetails',
                        playlistId=uploaded_playlist_id,
                        maxResults=50,
                        pageToken=nextPageToken
                    ).execute()

playlistItems.extend(response_playlist_items['items'])
                    nextPageToken = response_playlist_items.get('nextPageToken')
                    print('Token {0}'.format(nextPageToken))

videos = tuple(v['contentDetails'] for v in playlistItems)
                videos_info = []

for batch_num in range(0, len(videos), 50):
                    video_batch = videos[batch_num: batch_num + 50]

response_videos = service.videos().list(
                        id=','.join(list(map(lambda v:v['videoId'], video_batch))),
                        part='snippet,contentDetails,statistics',
                        maxResults=50
                    ).execute()

videos_info.extend(response_videos['items'])
                return videos_info
                #return playlistItems
            except errors.HttpError:
                print('Channel has 0 videos')
                return ''
            except Exception as e:
                print(e)
                return 0

@staticmethod
    def convert_duration(duration):
        try:
            h = int(re.search('\d+H', duration)[0][:-1]) * 60**2 if re.search('\d+H', duration) else 0
            m = int(re.search('\d+M', duration)[0][:-1]) * 60 if re.search('\d+M', duration) else 0
            s = int(re.search('\d+S', duration)[0][:-1]) if re.search('\d+S', duration) else 0
            return h + m + s
        except Exception as e:
            print(e)
            return 0

if __name__ == '__main__':
    CLIENT_SECRET_FILE = 'client_secret.json'
    SCOPES = ['https://www.googleapis.com/auth/youtube']
    yt = YouTube(CLIENT_SECRET_FILE, SCOPES)
    service = yt.construct_service_instance()

channel_id = 'UCJ6Pq_rvhBWQW8sw7rYlkfw'
    pprint(yt.get_channel_videos_detail(service, channel_id))

Python Fiddle

Python Cloud IDE