Python Practice › If-Else Programs › Program 10

Validate a user id in a list

EasyIf-Else Programs · 10 of 64

Write a Python program to check whether a user id is present in a list of user ids.

Input

ids = [101, 102, 205, 309]; check 205 and 404

Output

205 is a valid user id
404 is not a valid user id

Approach

Use the in operator to test membership.

Solution

Python

user_ids = [101, 102, 205, 309] for uid in [205, 404]:    if uid in user_ids:        print(uid, "is a valid user id")    else:        print(uid, "is not a valid user id")

Output

205 is a valid user id
404 is not a valid user id

Line by line

Line 4

in checks every item of the list and returns True or False.

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