id = str("Enter user ID: "))
b = int (input ("user's password input: ")))
dic = {'conan':1111 , 'rose':2222 , 'ran':3333}
passward = dic[id]
if id in dic:
if passward == b:
print("You have successfully logged in".")
else:
print("The password is invalid.")
else:
print("Not a registered user". Check your membership information.")
Reason why keyerror occurs when a value other than the value inside dictionary is entered in id
Enter user's ID: ccc
Enter user's password: 1111
Traceback (most recent call last):
File "C:\Users\82109\Desktop\Login Program.py", line 8, in <module>
passward = dic[id]
KeyError: 'ccc'
>>> a = {1: 'a'}
>>> a[2] = 'b'
>>> a
{1: 'a', 2: 'b'}
When 'ccc' approached the value without dic['ccc'] in the dictionary where the key does not exist,
There is a key error, and the password allocation statement cannot be established.
Do not initialize y first
If x = y then there is an error...
And since all return values of input statements are processed as strings, there is no need to convert them from id to str.
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