Fix #6256 : migrate to python 3.7+ (#6260)

docs/source/conf.py

@@ -319,7 +319,7 @@
 # -- Options for link checks ----------------------------------------------
 
 linkcheck_ignore = [
-    'http://127\.0\.0\.1/*'
+    r'http://127\.0\.0\.1/*'
 ]
 
 

notebook/__main__.py

@@ -1,4 +1,3 @@
-
 if __name__ == '__main__':
     from notebook import notebookapp as app
     app.launch_new_instance()

notebook/_sysinfo.py

@@ -55,10 +55,10 @@ def pkg_commit_hash(pkg_path):
             if repo_commit:
                 return 'repository', repo_commit.strip().decode('ascii')
             else:
-                return u'', u''
+                return '', ''
         par_path = p.dirname(par_path)
-                
-    return u'', u''
+
+    return '', ''
 
 
 def pkg_info(pkg_path):

notebook/auth/__main__.py

@@ -25,14 +25,17 @@ def set_password(args):
 		}
 	})
 	if not args.quiet:
-		print("password stored in config dir: %s" % jupyter_config_dir())
+		print(f"password stored in config dir: {jupyter_config_dir()}")
 
 def main(argv):
 	parser = argparse.ArgumentParser(argv[0])
 	subparsers = parser.add_subparsers()
 	parser_password = subparsers.add_parser('password', help='sets a password for your notebook server')
-	parser_password.add_argument("password", help="password to set, if not given, a password will be queried for (NOTE: this may not be safe)",
-			nargs="?")
+	parser_password.add_argument(
+		"password",
+		help="password to set, if not given, a password will be queried for (NOTE: this may not be safe)",
+		nargs="?"
+	)
 	parser_password.add_argument("--quiet", help="suppress messages", action="store_true")
 	parser_password.set_defaults(function=set_password)
 	args = parser.parse_args(argv[1:])

notebook/auth/login.py

@@ -48,15 +48,15 @@ def _redirect_safe(self, url, default=None):
             # OR pass our cross-origin check
             if parsed.netloc:
                 # if full URL, run our cross-origin check:
-                origin = '%s://%s' % (parsed.scheme, parsed.netloc)
+                origin = f'{parsed.scheme}://{parsed.netloc}'
                 origin = origin.lower()
                 if self.allow_origin:
                     allow = self.allow_origin == origin
                 elif self.allow_origin_pat:
                     allow = bool(self.allow_origin_pat.match(origin))
             if not allow:
                 # not allowed, use default
-                self.log.warning("Not allowing login redirect to %r" % url)
+                self.log.warning(f"Not allowing login redirect to {url!r}")
                 url = default
         self.redirect(url)
 
@@ -73,13 +73,13 @@ def hashed_password(self):
 
     def passwd_check(self, a, b):
         return passwd_check(a, b)
-    
+
     def post(self):
-        typed_password = self.get_argument('password', default=u'')
-        new_password = self.get_argument('new_password', default=u'')
+        typed_password = self.get_argument('password', default='')
+        new_password = self.get_argument('new_password', default='')
+
 
 
-
         if self.get_login_available(self.settings):
             if self.passwd_check(self.hashed_password, typed_password) and not new_password:
                 self.set_login_cookie(self, uuid.uuid4().hex)
@@ -89,7 +89,7 @@ def post(self):
                     config_dir = self.settings.get('config_dir')
                     config_file = os.path.join(config_dir, 'jupyter_notebook_config.json')
                     set_password(new_password, config_file=config_file)
-                    self.log.info("Wrote hashed password to %s" % config_file)
+                    self.log.info(f"Wrote hashed password to {config_file}")
             else:
                 self.set_status(401)
                 self._render(message={'error': 'Invalid credentials'})
@@ -197,7 +197,7 @@ def get_user(cls, handler):
     @classmethod
     def get_user_token(cls, handler):
         """Identify the user based on a token in the URL or Authorization header
-        
+
         Returns:
         - uuid if authenticated
         - None if not
@@ -245,7 +245,7 @@ def password_from_settings(cls, settings):
 
         If there is no configured password, an empty string will be returned.
         """
-        return settings.get('password', u'')
+        return settings.get('password', '')
 
     @classmethod
     def get_login_available(cls, settings):

notebook/auth/security.py

@@ -5,7 +5,6 @@
 from contextlib import contextmanager
 import getpass
 import hashlib
-import io
 import json
 import os
 import random
@@ -71,7 +70,7 @@ def passwd(passphrase=None, algorithm='argon2'):
         return ':'.join((algorithm, cast_unicode(h, 'ascii')))
     else:
         h = hashlib.new(algorithm)
-        salt = ('%0' + str(salt_len) + 'x') % random.getrandbits(4 * salt_len)
+        salt = f"{random.getrandbits(4 * salt_len):0{salt_len}x}"
         h.update(cast_bytes(passphrase, 'utf-8') + str_to_bytes(salt, 'ascii'))
 
         return ':'.join((algorithm, salt, h.hexdigest()))
@@ -135,7 +134,7 @@ def passwd_check(hashed_passphrase, passphrase):
 def persist_config(config_file=None, mode=0o600):
     """Context manager that can be used to modify a config object
 
-    On exit of the context manager, the config will be written back to disk, 
+    On exit of the context manager, the config will be written back to disk,
     by default with user-only (600) permissions.
     """
 
@@ -152,20 +151,20 @@ def persist_config(config_file=None, mode=0o600):
 
     yield config
 
-    with io.open(config_file, 'w', encoding='utf8') as f:
+    with open(config_file, 'w', encoding='utf8') as f:
         f.write(cast_unicode(json.dumps(config, indent=2)))
 
     try:
         os.chmod(config_file, mode)
     except Exception as e:
         tb = traceback.format_exc()
-        warnings.warn("Failed to set permissions on %s:\n%s" % (config_file, tb),
+        warnings.warn(f"Failed to set permissions on {config_file}:\n{tb}",
             RuntimeWarning)
 
 
 def set_password(password=None, config_file=None):
     """Ask user for password, store it in notebook json configuration file"""
-    
+
     hashed_password = passwd(password)
 
     with persist_config(config_file) as config:

notebook/auth/tests/test_security.py

@@ -18,8 +18,8 @@ def test_bad():
 
 def test_passwd_check_unicode():
     # GH issue #4524
-    phash = u'sha1:23862bc21dd3:7a415a95ae4580582e314072143d9c382c491e4f'
-    assert passwd_check(phash, u"łe¶ŧ←↓→")
-    phash = (u'argon2:$argon2id$v=19$m=10240,t=10,p=8$'
-             u'qjjDiZUofUVVnrVYxacnbA$l5pQq1bJ8zglGT2uXP6iOg')
-    assert passwd_check(phash, u"łe¶ŧ←↓→")
+    phash = 'sha1:23862bc21dd3:7a415a95ae4580582e314072143d9c382c491e4f'
+    assert passwd_check(phash, "łe¶ŧ←↓→")
+    phash = ('argon2:$argon2id$v=19$m=10240,t=10,p=8$'
+             'qjjDiZUofUVVnrVYxacnbA$l5pQq1bJ8zglGT2uXP6iOg')
+    assert passwd_check(phash, "łe¶ŧ←↓→")