fix: Consistent boolean parameter checking

lib/random_user.py

@@ -7,6 +7,7 @@ import glob
 import base64
 import random
 import string
+import sys
 
 class RandomUser:
 
@@ -41,11 +42,21 @@ class RandomUser:
             person["email"] = password_reset_mail
             person['is_admin'] = False
             callback(person)
-            if create_admins:
+            if self.__option2bool(create_admins):
                 person['username'] = self.__get_username(person["firstname"], person["lastname"], admin=True)
                 person['is_admin'] = True
                 callback(person)
 
+    def __option2bool(self, string):
+        if isinstance(string, (bool)):
+            return string
+        elif string.lower() in ['true', 'yes', 'ok']:
+            return True
+        elif string.lower() in ['false', 'no', 'nok']:
+            return False
+        else:
+            sys.exit(f"Cannot convert {string} into a boolean value.")
+
     def __get_firstname_and_gender(self):
         to_split_result = self.__get_random_list_entry("firstname")
         return to_split_result.split('\t')