如何使用 if 语句根据相应的键访问字典中的值？

Question

I thought I could use a dictionary to store key/value pairs for user's names and passwords. How do I use a if statement to access values in a dictionary based on the corresponding key?

users_data_base = dict(Mike = "Speedy203", Ken = "Justify30", Marvin = "Pop_Jay")
while True:
    current_user = input("Enter User Name: ")
    if current_user not  in users_data_base:
        print("User name not valid")
    else:
        
        print("Welcome " + current_user)
        break
while True:
    pw_entry = input("Please enter password: ")
    if pw_entry is ([current_user]):
        print("Incorrect password entry")
        print("Try again")
    else:
        print("Successful entry")
        break

Answer 1

You are missing the dictionary's name in the second if :

if pw_entry == user_data_base[current_user]:
    # Here ----^