Add console interface and some error handling in case of invalud scre…

…en name input by user

api/get_twitter_api.py

@@ -50,4 +50,4 @@ def get_current_user_json_field(field_name: str) -> object:
 if __name__ == '__main__':
     api: API = get_twitter_api(os.path.join('app_data', 'twitter_api_keys.json'))
     # Query the API for self data to make sure it's working
-    print(f'Current API user: {get_current_user_json_field("screen_name")}')
+    print(f'Current API user: {get_current_user_json_field("_screen_name")}')

followers/extract_all_user_followers_ids.py

@@ -3,34 +3,47 @@
 from typing import List, TextIO
 
 import tweepy
+from tweepy import TweepError
 
 from api import get_twitter_api as api
 
 PATH_TO_APP_DATA = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'app_data')
 
 
-def extract_all_user_followers_ids(screen_name: str = '') -> str:
+def extract_all_user_followers_ids(screen_name: str) -> str:
     """
     Get all of an account's followers' user IDs and write them to a JSON file with today's date.
     :param screen_name: The screen name of the account to query. If left blank, will use the API user's screen name.
     :return: The file path where the queried data was written.
     """
     _api = api.get_twitter_api(os.path.join(PATH_TO_APP_DATA, 'twitter_api_keys.json'))
-    if screen_name == '':
+    if screen_name == '' or not screen_name:
         screen_name = api.get_current_user_json_field('screen_name')
-    _output_file_name = f'user_followers_ids {screen_name} {datetime.date.today()}.txt'
+    _output_file_name = f'user_followers_ids {screen_name.lower()} {datetime.date.today()}.txt'
     _output_file_path = os.path.join(PATH_TO_APP_DATA, _output_file_name)
     _followers_count: int = 0
-    for page in tweepy.Cursor(_api.followers_ids, screen_name=screen_name).pages():
-        _output_file: TextIO
-        with open(_output_file_path, 'w') as _output_file:
-            for item in page:
-                _output_file.write(f'{item}\n')
-    return _output_file_path
+    try:
+        for page in tweepy.Cursor(_api.followers_ids, screen_name=screen_name).pages():
+            _output_file: TextIO
+            with open(_output_file_path, 'w') as _output_file:
+                for item in page:
+                    _output_file.write(f'{item}\n')
+        return _output_file_path
+    except TweepError as err:
+        print(f'Could not query screen name: {screen_name}\nError(s) found:')
+        print(err)
+        raise err
 
 
 if __name__ == '__main__':
-    output_file_path: str = extract_all_user_followers_ids()
+    print('Enter user screen name you wish to extract followers\' IDs, then press Enter.')
+    print('Do not include @ symbol before screen name.')
+    print('Leave blank to use your own screen name.')
+    _screen_name: str = input('Screen name: ')
+    # Just in case they don't read instructions ;-)
+    _screen_name = _screen_name.replace('@', '')
+
+    output_file_path: str = extract_all_user_followers_ids(_screen_name)
     print(f'Results saved to file: {output_file_path}')
     followers_count: int = 0
     with open(output_file_path, 'r') as file: