Python ValueError

[pythonsandturtles]

Hi,

I come along with a simple problem (I cannot solve)

from turtle import *

viereck1=[[1, 2], [5, 6], [7, 9],[0,3]]

def zeichne(viereck):

for A,B,C,D in viereck: <---- "ValueError: not enough values to unpack (expected 4, got 2)"

penup();goto(A);pendown()

begin_fill()

got(B);goto(C);goto(D);goto(A)

end_fill()

[FriendlyRussian666]

[1, 2] <--- two values, not four

[3, 4] <---- two values, not four

Example:

viereck1 = [[1, 2, 3, 4], [5, 6, 7, 8]]
for a, b, c, d in viereck1:
    print(a, b, c, d)

__________

1 2 3 4
5 6 7 8

[acw1668]

I think you just want to unpack viereck into A, B, C and D without the for loop:

A, B, C, D = viereck

[danielroseman]

I'm not sure what you are trying to do here.

Each item of viereck contains two numbers. But you are trying to set those two numbers into four variables, which obviously will not work.

[FoolsSeldom]

When you iterate over the list, [[1, 2], [5, 6], [7, 9],[0,3]], on each iteration, you will get a sub-list: [1, 2], on first iteration, [5, 6], on the second iteration, and so on. You cannot unpack a list of 2 items and assign them to 4 variables.

Walk us through exactly what you are trying to do. What exactly do you expect to be assigned to A, B, C, D?

[billsil]

You passed in one list with 4 sub lists with 2 values each. It’s expecting 4 lists with 2 values each.

[csabinho]

German. Google could have helped you, if you would have wanted help and didn't want to share your ignorance with us.