Closes: #1

Updated validations.py python script.
Fixed the behavior of validate_user function in validations.py.

Course3/Lab4/validations.py

@@ -9,6 +9,11 @@ def validate_user(username, minlen):
     if minlen < 1:
         raise ValueError("minlen must be at least 1")
 
+    # validate the first character doesn't start with either of the forbidden characters.
+    # Forbidden characters are: . and _
+    if username[0] == "." or username[0] == "_":
+        return False
+
     # Usernames can't be shorter than minlen
     if len(username) < minlen:
         return False
@@ -20,5 +25,9 @@ def validate_user(username, minlen):
         return False
     return True
 
+print(validate_user("blue.kale", 3)) # True
+print(validate_user(".blue.kale", 3)) # Currently True, should be False
+print(validate_user("red_quinoa", 4)) # True
+print(validate_user("_red_quinoa", 4)) # Currently True, should be False