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I've been attempting to set a keyframe for the Bevel Factor Start and End of a Curve.

I've tried using 

bpy.ops.anim.keyframe_insert_button(
        'Curve.bevel_factor_start', 
         index=-1, 
         frame=bpy.context.scene.frame_current, 
         group="")

But I really don't know where to go from here. Pressing "I" works just fine but I can't find the right command in the API to control this property

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  • $\begingroup$ As an addendum to Ratt's answer: By blenders naming convention, if a name starts with a capital it is a class. in this case. bpy.types.Curve A curve objects data part is an instance of type Curve. $\endgroup$ – batFINGER Jan 31 '19 at 20:18
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While likely not optimized the following appears to work both in blender 2.79b official and the 2.80 beta build I have at the moment and may assist in how to handle adding the key frames and manipulating them afterwards.

import bpy

obj = bpy.context.active_object  # Your pre-existing selected curve


def add_keyframes(obj):
    if obj.data.bevel_object:  # verify bevel object already selected
        obj.data.keyframe_insert(
                "bevel_factor_start",
                index=-1,
#                frame=1,  # defaults to current frame
#                group=""
                )
        obj.data.keyframe_insert(
                "bevel_factor_end",
                index=-1,
#                frame=1,  # defaults to current frame
#                group=""
                )

add_keyframes(obj)


def mod_fcurve(obj, path):
    for fc in obj.data.animation_data.action.fcurves:
        if fc.data_path == path:
            my_fc = fc
    for pt in my_fc.keyframe_points:
        pt.co.x += 1  # increase x 'frame number' of points
        pt.co.y += 0.1  # increase y 'value' of all pts in curve


mod_fcurve(obj, "bevel_factor_start")
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Figured it out, this is what I was trying to achieve

bpy.context.object.data.bevel_factor_start = 0 #set factor to 0 bpy.context.object.data.keyframe_insert(data_path='bevel_factor_start') #keyframe it

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