Tukar dua kolom Python
# 2d array a[row][col] , swap the columns h and k
for i in range(row):
a[i][k] , a[i][h] = a[i][h], a[i][k]
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# 2d array a[row][col] , swap the columns h and k
for i in range(row):
a[i][k] , a[i][h] = a[i][h], a[i][k]