Differences between parentheses, braces [], and curly braces {} in Python 3 in detail

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The three most common types of parentheses in the Python language are: parentheses (), braces [], and braces {}; they serve different purposes, and are used to represent different basic Python built-in data types.

parentheses ( )

Parentheses () in Python:

Represents the tuple meta-ancestor datatype; a meta-ancestor is an immutable sequence.

typical example

>>> a = (12,23)
>>> a
(12, 23)
>>> ()  #Empty Metamorphosis
()
>>> 1, # The meta-ancestor of a value
(1,)

Brackets []

The center bracket [] in Python:
Represents the list datatype, a list is a variable sequence.

typical example

>>> list('home')
 ['h', 'o', 'm', 'e']

An example of a two-dimensional list is shown below:

list_sample = [['IBM','Apple','Lenove'],['America','China']]

The list is accessed by an index value starting at 0, which can be negative, representing access from back to front:

>>> vehicle = ['train','bus','car','ship']

>>> vehicle[-2]

'car'

Parentheses {}

The curly braces {} in Python:
Represents the dict dictionary datatype, which is the only built-in mapping type in Python. The values in a dictionary are in no particular order, but are stored under a specific key. The key can be a number, a string with a meta ancestor.

typical example

>>> dic = {'jay':'boy','may"':'girl'}
>>> dic
{'jay': 'boy', 'may': 'girl'}

The list() function allows you to convert a dictionary into a list, but a list cannot be converted into a dictionary.

Similarly, a dictionary can be converted to a tuple through the tuple() function, but a tuple cannot be converted to a dictionary

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