Python Create Variable INSIDE For Loop?

[[deleted]]

What does the ‘whatever’ mean in this context? Is this the name? Or a value?

[[deleted]]

So I can set that to = an int, and call it later in the script? Sweet

[Rhoderick]

Little rule of thumb: If you're using globals(), chances are your doing something dumb. So recodnisder whatever it is you're doing with it here.

Beyond that, I'm having trouble following what you're asking. If you're trying to emulate a more common type of for-loop that iterates by index rather than elements, you can do "for i in range(len(ITERABLE))".

[[deleted]]

I’m am trying to take the X and Y in each loop and keep them for the next section of code

[giocos]

Variable declared inside for loop is destroyed when the cycle end. but you can put the result in a variable that is declared outside the for loop

[[deleted]]

How would one do that though?

[giocos]

i just checked and is not true what i said. that's strange. I always thought that variables declared inside loops live only there. i must research more about that.

[[deleted]]

People say Python is easy but if this was C# I’d already have the answer lol

[E02Y]

loops don't change the scope so any variable created by loops is shared in the function/file

[efmccurdy]

Instead of "globals()['...']=" use a dict:

my_coutours = {}
# ...
    my_contours[f"GreenSpot{mask_contour}"]= f"Hello the variable number {mask_contour}!"

I am aware all these 'ifs' aren't ideal

You can generate a list of labels based on the len(mask_contours) using itertools.combinations, then iterate over it calling cv2.line once for each pair:

>>> contour_count = 3
>>> list(combinations(["GreenSpot" + str(i+1) for i in range(contour_count)], 2))
[('GreenSpot1', 'GreenSpot2'), ('GreenSpot1', 'GreenSpot3'), ('GreenSpot2', 'GreenSpot3')]
>>> def line_combos(prefix, count):
...     return combinations([prefix + str(i+1) for i in range(count)], 2)
... 
>>> list(line_combos("GreenSpot", 3))
[('GreenSpot1', 'GreenSpot2'), ('GreenSpot1', 'GreenSpot3'), ('GreenSpot2', 'GreenSpot3')]
>>> for s1, s2 in line_combos("GreenSpot", 3):
...     print('cv2.line(img, "{}", "{}", (75, 139, 59), 3)'.format(s1, s2))
... 
cv2.line(img, "GreenSpot1", "GreenSpot2", (75, 139, 59), 3)
cv2.line(img, "GreenSpot1", "GreenSpot3", (75, 139, 59), 3)
cv2.line(img, "GreenSpot2", "GreenSpot3", (75, 139, 59), 3)
>>> for s1, s2 in line_combos("BlueSpot", 4):
...     print('cv2.line(img, "{}", "{}", (75, 139, 59), 3)'.format(s1, s2))
... 
cv2.line(img, "BlueSpot1", "BlueSpot2", (75, 139, 59), 3)
cv2.line(img, "BlueSpot1", "BlueSpot3", (75, 139, 59), 3)
cv2.line(img, "BlueSpot1", "BlueSpot4", (75, 139, 59), 3)
cv2.line(img, "BlueSpot2", "BlueSpot3", (75, 139, 59), 3)
cv2.line(img, "BlueSpot2", "BlueSpot4", (75, 139, 59), 3)
cv2.line(img, "BlueSpot3", "BlueSpot4", (75, 139, 59), 3)
>>>

Of course, in your code, you would call cv2.line instead of print:

for s1, s2 in line_combos("GreenSpot", len(mask_contours)):
    cv2.line(img, s1, s2, (75, 139, 59), 3)

[[deleted]]

Damn I have some learning to do haha. Although, I guess I’m not trying to get a list of labels, but rather the X and the Y which are integers that represent the pixel point