for loops in python 3

These 2 loops are the same.

subscriber_user_ids = []

#first loop
for user_record in [2,3,4,5]:
    subscriber_user_ids.append(user_record)
    print(user_record)

#second loop   
str1 = ','.join(str(user_record) for user_record in [2,3,4,5])
print(str1)


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