edit user IO

user_IO.py

@@ -1,4 +1,4 @@
-def userinput():
+def user_input():
     print("Hi User, \n do you want to edit your grades?")
     todo = input("Ok, do you want to see them or to edit them? [see/edit]\n")
     if todo == "see":
@@ -7,19 +7,18 @@ def userinput():
         return "output", subject
     elif todo == "edit":
         print("Do you want to add a subject, a category or a grade? [subject/category/grade]")
-        useradd = input()
-        if useradd == "subject":
+        user_add = input()
+        if user_add == "subject":
             subject = input("Which subject do you want to add? \n")
             return "input", subject
-        elif todo == "category":
+        elif user_add == "category":
             subject = input("To which subject do you want to add the category? \n")
             category = input("Which category do you want to add? \n")
             rating = float(input("Rating? \n"))
             return "input", subject, category, rating
-        elif todo == "grade":
+        elif user_add == "grade":
             subject = input("To which subject do you want to add the grade? \n")
             category = input("To which category do you want to add it? \n")
             grade = input("Grade? \n")
-            gradename = input("What's the name of the grade? \n")
-            return "input", subject, category, grade, gradename
-
+            grade_name = input("What's the name of the grade? \n")
+            return "input", subject, category, grade, grade_name