What does |= (pipe equal) sign do in python?

Question

I saw a piece of code in a project where following is written:

 move = Move.create({
    'name': repair.name,
    'product_id': repair.product_id.id,
    'product_uom': repair.product_uom.id or repair.product_id.uom_id.id,
    'product_uom_qty': repair.product_qty,
    'partner_id': repair.address_id.id,
    'location_id': repair.location_id.id,
    'location_dest_id': repair.location_dest_id.id,
    'restrict_lot_id': repair.lot_id.id,
})
moves |= move
moves.action_done()

What does the |= meaning here?

Asked By: Tanzil Khan

||

Source

Answer 1

As @AChampion already mentioned in the first question comment, it could be "bitwise or" or "set union". While this question has Odoo as context, it is "set union" for the Odoo class RecordSet.

For your example: It’s the same as moves = moves | move and means a union of moves and move.

This class was introduced with the new API on Odoo 8. For other operators look into the official doc of Odoo.

Answered By: CZoellner

Answer 2

It simply means moves = move | moves.

Answered By: Mehran BaghGolshani

Answer 3

It’s a compound operator, when you say: x |= y it’s equivalent to x = x | y

The | operator means bitwise or and it operates on integers at the bit-by-bit level, here is an example:

a = 3    #                (011)
         #                 |||
b = 4    #                (100)
         #                 |||
a |= b   #<-- a is now 7  (111)

Another example:

a = 2    #                (10)
         #                 ||
b = 2    #                (10)
         #                 ||
a |= b   #<-- a is now 2  (10)

So each bit in the result will be set if that same bit is set in either of the two sources and zero if both of the two sources has a zero in that bit.

The pipe is also used on sets to get the union:

a = {1,2,3}
b = {2,3,4}
c = {4,5,6}
print(a | b | c)  # <--- {1, 2, 3, 4, 5, 6}

Answered By: Bilal

What does |= (pipe equal) sign do in python?

Question:

Answers: