emoji_eventsBalanced brackets

Write is_balanced(text) that returns True when every (, [ and { in the text is closed by the matching bracket in the right order.

• Other characters are ignored, so "print(items[0])" is balanced.
• "(]" and "(()" are not.

Acceptance criteria

• An empty string is balanced.
• The tests at the bottom print All tests passed.

Hint: a stack (a Python list) is all you need.