var1 = var2 = var3

[anotherdjangonewby]

Hi,

this may be a bit off-topic, but:

How are expressions like:

var1 = var2 = var3

called Python. Without a hint I cannot goolge this.

Thanks

Kai

[Alex Heyden]

That's an assignment statement. See https://docs.python.org/2/reference/simple_stmts.html for more.

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[srinivas devaki]

what a coincidence, i just asked a similar question 7 hours before
you, at pytho...@python.org

here's the link, you can extend the discussion there to get more
answers, as it is more related to the language rather than django.

link: https://mail.python.org/pipermail/python-list/2016-February/703235.html

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[Nikolas Stevenson-Molnar]

The term is "chained assignment" (applied to other languages as well).

https://en.wikipedia.org/wiki/Assignment_(computer_science)#Chained_assignment

_Nik

[Bill Freeman]

The interesting thing is how chained assignment is implemented.  In C, the following is an expression, and has a value:

   a = b

This leads to the compiler not being helpful for the famous =/== typo in this like:

  if (a = b)  { ... }

In python the only expression in:

  a = b = c

only has one expression: c

The rest is syntax for the assignment statement, where trailing = identifies each of the targets to which the value of c is to be assigned.

An assignment statement begins with a series of one or more target specifiers and ends with a single expression.

(Targets can be more complex, e.g.; x, y = p = 0, 0)

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