Python Combine "for" and "if" statement - Useful for loopping through JSON and find data using keys

Python_Combine_for_and_if_statement.py

users = [{
    "user_id": 1,
    "hobby": "Play Football"
}, {
    "user_id": 1,
    "hobby": "Play Basketball"
}]

# Given data above, if you want loop through the JSON and check if a specific user exist,
# you can do it with the code below.

user_exist = False
for user in users:
    if user['user_id'] == 1:
        user_exist = True
        # do other stuffs
if not user_exist:
     # user don't exist


# Another way to do this is to use the generator expression.
gen = (True for user in users if user['user_id'] == 1)
if True not in gen:
    # user don't exist