What is the meaning of curly braces? [closed]

"Curly Braces" are used in Python to define a dictionary. A dictionary is a data structure that maps one value to another - kind of like how an English dictionary maps a word to its definition.

Python:

dict = {    "a" : "Apple",    "b" : "Banana",}

They are also used to format strings, instead of the old C style using %, like:

ds = ['a', 'b', 'c', 'd']x = ['has_{} 1'.format(d) for d in ds]print x['has_a 1', 'has_b 1', 'has_c 1', 'has_d 1']

They are not used to denote code blocks as they are in many "C-like" languages.

C:

if (condition) {    // do this}

Update: In addition to Python's dict data types Python has (since Python 2.7) set as well, which uses curly braces too and are declared as follows:

my_set = {1, 2, 3, 4}

In Python, curly braces are used to define a dictionary.

a={'one':1, 'two':2, 'three':3}a['one']=1a['three']=3

In other languages, { } are used as part of the flow control. Python however used indentation as its flow control because of its focus on readable code.

for entry in entries:     code....

There's a little easter egg in Python when it comes to braces. Try running this on the Python Shell and enjoy.

from __future__ import braces

In languages like C curly braces ({}) are used to create program blocks used in flow control. In Python, curly braces are used to define a data structure called a dictionary (a key/value mapping), while white space indentation is used to define program blocks.