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First solution in Clear category for Skew-symmetric Matrix by Fokzterrier
def checkio(matrix):
c = matrix
l = list(range(len(c)))
print(c)
print(l)
for i in l:
for j in l:
Q = c[i][j]
W = c[j][i]
if c[i][i] !=0:
print('false')
return False
if Q != (-1) * W:
print('false')
return False
print(Q,'Q',W,'W')
return True
#These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
assert checkio([
[0, 1, 2],
[-1, 0, 1],
[-2, -1, 0]]) == True, "1st example"
assert checkio([
[0, 1, 2],
[-1, 1, 1],
[-2, -1, 0]]) == False, "2nd example"
assert checkio([
[0, 1, 2],
[-1, 0, 1],
[-3, -1, 0]]) == False, "3rd example"
Nov. 21, 2016