How add image texture to object

I need add part of image (image is transparenting in some places) to object?

for example I need simple procedure

def appimage(“name_object”, “name of texture”, dx, dy)

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This working, but I cant load image and assign to object

tek = bpy.data.materials.new(name=nazwa_tek)
tek.diffuse_color = (1.0, 0.0, 0.0, 0.8)
print(“tekstura:=”, tek)
my_object.data.materials.append(tek)