[999.7382621, -1.4637250000000002]
[-1.5490111999999998, 1.5490111999999998]

elements = [map(str, line.split(",")) for line in mylists]

[['9'], ['9'], ['9'], ['.'], ['7'], ['3'], ['8'], ['2'], ['6'], ['2'], ['1'],['', ''], ['-'], ['1'], ['.'], ['4'], ['6'], ['3'], ['7'], ['2'], ['5']]
[['-'], ['1'], ['.'], ['5'], ['4'], ['9'], ['0'], ['1'], ['1'], ['2'], ['', ''], ['1'], ['.'], ['5'], ['4'], ['9'], ['0'], ['1'], ['1'], ['2']]

[['999.7382621'],['-1.4637250000000002']]
[['-1.5490111999999998'],['1.5490111999999998']]