How to assign a list that is set as a variable to another list (python)

Question

In building a config file, I'm trying to add a list to another list. I'd rather not use any functions like append or python logic in this config file. Some examples are listed below:

config = {
 'users': [
 'user1',
 'user2',
 'user3'
 ]
}
admin_access = {
 'allowed_users': [
 config['users'],
 'adminuser1',
 'adminuser2'
 ]
}

Am I going about this the right way or am I completely off?

• Sharim09: What output do you want?
• Xyndra: This kind of looks like it would be working
• BeRT2me: Why not just run your code and look at the output... Here admin_access = {'allowed_users': [['user1', 'user2', 'user3'], 'adminuser1', 'adminuser2']}
• Sharim09: Are you want this output {'allowed_users': ['user1', 'user2', 'user3', 'adminuser1', 'adminuser2']}or above
• Schattener: Solution found by @BeRT2me via the * prefix operator which unpacks the list!

Answer 1

I think what you may be looking for is:

admin_access = {
 'allowed_users': [
 *config['users'],
 'adminuser1',
 'adminuser2'
 ]
}

Which gives:

{'allowed_users': ['user1', 'user2', 'user3', 'adminuser1', 'adminuser2']}

---

If you couldn't directly create admin_access like this, you could also add on the wanted list like this:

# Given
config = {'users': ['user1', 'user2', 'user3']}
admin_access = {'allowed_users': ['adminuser1', 'adminuser2']}
# Do
admin_access['allowed_users'] += config['users']
# Outputs
print(admin_access)
{'allowed_users': ['adminuser1', 'adminuser2', 'user1', 'user2', 'user3']}

• Schattener: This is exactly what is needed! Thank you very much! Can you give a brief explanation about why that works or what it does?
• Ramrab: The asterisk is an unpacking operator in this context
• Schattener: Much appreciated @LancelotduLac, that's what I was wondering about!
• BeRT2me: A lot of places only reference the * operator in the context of functions, but this article Does a good job of explaining it in the context of lists and dicts as well~
• Schattener: Understood, I'll go over that article, thanks again @BeRT2me!