Dictionaries in Python are .

A is a collection of key-value pairs.

A key in a Python dictionary must be of a(n) type.

A key in a Python dictionary must be of a(n) type.

The function used to check if a key is present in a dictionary is ().

In Python, dictionaries are denoted by enclosing a comma-separated pair of curly braces with within.

The method used to remove a key-value pair from a dictionary is ().

The method used to remove a key-value pair from a dictionary is ().

Dictionaries in Python are .