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Programming-Idioms

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  • Python

Idiom #249 Declare and assign multiple variables

Define variables a, b and c in a concise way.
Explain if they need to have the same type.

a, b, c = 42, 'hello', 5.0

a, b and c may have different types.
from decimal import Decimal
a, b, c = Decimal(1.23).as_tuple()
a, b, *c = '110000'

This syntax is very useful in parsing "block code" data.
a, b, c = 'xyz'
*a, b, c = '000011'

'... If the target list contains one target prefixed with an asterisk, called a “starred” target: The object must be an iterable with at least as many items as there are targets in the target list, minus one.'
var (a, b, c) = (42, "hello", 5.0);

a, b, and c may have different types.
New implementation...
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programming-idioms.org 
a, b, c = 42, 'hello', 5.0
a, b, c = Decimal(1.23).as_tuple()
a, b, *c = '110000'
a, b, c = 'xyz'
*a, b, c = '000011'
var (a, b, c) = (42, "hello", 5.0);
var a = 42, b = "Hello", c = 5.0;
{A, B, C} = {42, "hello", 5.0}.
integer :: a, b, c
a, b, c := 42, "hello", 5.0
(a, b, c) = (42, "hello", 5.0)
const [a, b, c] = [42, "hello", 5.0];
Object a = 42, b = "Hello", c = 5.;
int a, b, c = b = a = 123;
val (a, b, c) = listOf("A", "B", "C")
my ($a, $b, $c) = (1, '2', 'three');
a, b, c = 42, 'hello', 5.0
let (a, b, c) = (42, "hello", 5.0);