Closes: google#33682

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

Course3/Lab4/validations.py

@@ -18,7 +18,13 @@ def validate_user(username, minlen):
     # Usernames can't begin with a number
     if username[0].isnumeric():
         return False
+    if not username[0].isalpha():
+        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