How to generate random pairs of numbers in Python, including pairs with one entry being the same and excluding pairs with both entries being the same?

Question

I\'m using Python and was using numpy for this. I want to generate pairs of random numbers. I want to exclude repetitive outcomes of pairs with both entries being the s

Answer 1

Generator random unique coordinates:

from random import randint

def gencoordinates(m, n):
    seen = set()

    x, y = randint(m, n), randint(m, n)

    while True:
        seen.add((x, y))
        yield (x, y)
        x, y = randint(m, n), randint(m, n)
        while (x, y) in seen:
            x, y = randint(m, n), randint(m, n)

Output:

>>> g = gencoordinates(1, 100)
>>> next(g)
(42, 98)
>>> next(g)
(9, 5)
>>> next(g)
(89, 29)
>>> next(g)
(67, 56)
>>> next(g)
(63, 65)
>>> next(g)
(92, 66)
>>> next(g)
(11, 46)
>>> next(g)
(68, 21)
>>> next(g)
(85, 6)
>>> next(g)
(95, 97)
>>> next(g)
(20, 6)
>>> next(g)
(20, 86)

As you can see coincidentally an x coordinate was repeated!