[Python] get row and column of matrix

I wonder where how to get row and column of this matrix. I want to loop through each element[row][column], but I have no idea how to get these.

imaginary_axis = 100
real_axis = 1

mixed_matrix = [[0 for j in xrange(imaginary_axis)] for i in xrange(real_axis)]

for row in mixed_matrix[0]:
print(row)
for column in mixed_matrix:
print(column)
check(mixed_matrix[row][column])


This throws an error. How can I get this to work?

TypeError: list indices must be integers, not list


I know why I get this error, but I do not know how I can get the column right.

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