Python assigns values ​​​​to multiple variables at the same time

Assign multiple values ​​at the same time

Here’s a cool programming shortcut: In Python, you can use tuples to assign multiple values ​​at once

.

>>> v = ('a', 2, True)

>>> (x, y, z) = v ①

>>> x

'a'

>>> y

2

>>> z

True

1. v is a tuple of three elements, and (x, y, z) is a tuple of three variables. Assigning one to the other will assign each value in v to each variable in order. This feature has several uses. Suppose you need to assign a name to a specific range of

values. You can use the built-in range() function for multi-variable assignment to quickly perform continuous variable assignments.

>>> (MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY,

SATURDAY, SUNDAY) = range(7) ①

>>> MONDAY                                                   

②

0

>>> TUESDAY

1

>>> SUNDAY

6

1. The built-in range() function constructs an integer sequence. (Technically, the range() function returns neither a list nor a tuple, but an iterator, but you'll learn the difference later.) MONDAY, TUESDAY, WEDNESDAY , THURSDAY, FRIDAY, SATURDAY and SUNDAY are variables defined by you. (This example comes from the calendar module, a short and fun module that prints a calendar, somewhat like the UNIX program cal. The calendar module defines integer constants for the day of the week.

2. Now, each variable has its The value is: MONDAY is 0, TUESDAY is 1, and so on.

You can also use multi-variable assignment to create a function that returns multiple values. The caller can just return a tuple containing all the values. Treat the value as a simple tuple, or

assign it to a different variable

.