assign variable in while statement python

Question

Hi i'm trying to get a set of points from matplotlib.pyplot.ginput. my idea is to save points in a list while the actuaPoint!=lastPoint

is there a way to do it something like:

lastPoint = None
pointList = []

actualPoint = plt.ginput(1)
while (actualPoint=plt.input()) != lastPoint:
    pointList.append(actualPoint)
    lastPoint= actualPoint

? resuming i'm trying to know if there's a way to do the variable assignment inside the while statement

Important to mention that := operator works only in python 3.9+ ! — Peter Trcka
– Peter Trcka, Commented Oct 28, 2021 at 20:27

chepner · Accepted Answer · 2021-10-28 20:16:40Z

1

You need to use an assignment expression, using the := operator.

point, = pointList = [plt.ginput(1)]
while (next_point := plt.input()) != point:
    pointList.append(next_point)
    point = next_point

edited Oct 28, 2021 at 20:16

answered Oct 28, 2021 at 20:11

chepner

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2 Comments

Ulises Bussi Over a year ago

This was exactly was I was looking for! many thanks! worked like charm! Also im gonna edit my post i wanted to user plt.ginput not input. If you could modify yours to match would be perfect

chepner Over a year ago

That actually makes it a little nicer, as I was struggling to find a cleaner way to avoid the duplicate call to plt.input.

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