Quick Question about Dictionaries

[Extra]

Hello,

I'm trying to make a simple login page through the terminal and I decided to use a dictionary to store the user's name and password.

As show in my code here (Ya I realize now, I probably don't need the whole function housing the dict):

def StandardUsers():
    users = {
        "Bob" : 1234,
        "Jim" : 5678,
        "Roger" : 9101,
        "Frank" : 8877
    }
    return users

def SuperUsers():
    admins = {
        "Joe" : 0000,
        "Randall" : 1111
    }
    return admins

(Ex: "Bob":1234 Where "Bob" is the user's name and 1234 is the password)

And I have an input statement that takes in the user's name and password as shown here:

def login():
    print('=============================')
    print('= Login =')
    print('=============================')
    user = input("Enter your name: ")
    password = input("Enter your password: ")
    validate() #Go to validate function

And this is my validate function that I have right now:

def validate(user):
    #if StandardUsers enters in correct name and password:
        MainMenu()

    #if SuperUsers enters in the correct name and password:
        AdminMenu()
        
    else:
        print('You are not registered to use this program')
        login()

My question is: how do I validate the user's name and password in an if statement so they can get to the menu? (How do I check to make sure the key, value pairs in the dict match, and apply them to my validate function)

Thanks in advance.