What's the difference between () vs [] vs {}?
() - tuple
A tuple is a sequence of items that can't be changed (immutable).
[] - list
A list is a sequence of items that can be changed (mutable).
{} - dictionary or set
A dictionary is a list of key-value pairs, with unique keys (mutable). From Python 2.7/3.1, {}
can also represent a set of unique values (mutable).
- () is a tuple: An immutable collection of values, usually (but not necessarily) of different types.
- [] is a list: A mutable collection of values, usually (but not necessarily) of the same type.
- {} is a dict: Use a dictionary for key value pairs.
For the difference between lists and tuples see here. See also:
- Python Tuples are Not Just Constant Lists
() - tuple
[] - list
{} - dictionary
All Python tutorials should cover this. Here is a good place to start.