How to remove all blendshape drivers in Blender 2.79?

I must remove all drivers from all shapekeys on the selected mesh in Blender 2.79. I have tested this script for 2.8 from this answer:

import bpy

fcurves =["Key"].animation_data.drivers

for fc in fcurves:

But I get an error AttributeError: 'bpy_prop_collection' object has no attribute 'remove'

It works fine in 2.8 but is it possible to accomplish with python in Blender 2.79?