correct text-array to download script, ask for usernames if empty, improve argparse, linting to black

Signed-off-by: Matthias <matthias@pebble>

images_par_username.py

@@ -1,38 +1,51 @@
-import requests, json
+import os, requests, json
 import argparse
 from urllib.parse import quote
 
-def parse_args(argv =None):
+
+def parse_args(argv=None):
     parser = argparse.ArgumentParser()
-    parser.add_argument('--access_token', type=str, help='Your mapillary access token')
-    parser.add_argument('--username', type=str, help='Username to get the sequences id of')
-    parser.add_argument('--pictures', type=str, help='Limit of pictures to fetch')
+    parser.add_argument(
+        "--access_token",
+        type=str,
+        default=os.environ["MAPILLARY_DEV_TOKEN"],
+        help="Your mapillary access token",
+    )
+    parser.add_argument(
+        "--username",
+        type=str,
+        required=True,
+        help="Username to get the sequences id of",
+    )
+    parser.add_argument(
+        "--pictures",
+        type=str,
+        default=500,
+        help="Limit of pictures to fetch, max=5000",
+    )
 
     global args
     args = parser.parse_args(argv)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     parse_args()
 
-    if args.access_token == None:
-        print('please provide the access_token')
-        exit()
-
     mly_key = args.access_token
     creator_username = args.username
-    max_img= args.pictures
+    max_img = args.pictures
 
-    url = f'https://graph.mapillary.com/images?access_token={mly_key}&creator_username={creator_username}&limit={max_img}&fields=id,sequence'
+    url = f"https://graph.mapillary.com/images?access_token={mly_key}&creator_username={creator_username}&limit={max_img}&fields=id,sequence"
+    print(url)
 
     response = requests.get(url)
 
     if response.status_code == 200:
-       json = response.json()
+        json = response.json()
 
-       # tri des séquences uniques
-       sequences_ids = [obj['sequence'] for obj in json['data']]
-       unique_ids = list(set(sequences_ids))
-       print(unique_ids)
+        # tri des séquences uniques
+        sequences_ids = [obj["sequence"] for obj in json["data"]]
+        unique_ids = list(set(sequences_ids))
+        print(unique_ids)
     else:
-       print(response)
+        print(response)