glVertexAttribPointer() can't find valid context on Wayland environment?

I try to draw colorized triangle. I want to use modern OpenGL and translate data via vertex attrib array.

Vertex shader and Fragment shader just pass color from input to output and don’t contain any interesting code

pg.init()

triangle = np.array( triangle, dtype=np.float32 )
triangle_buffer = glGenBuffers( 1 )

glBindBuffer( GL_ARRAY_BUFFER, triangle_buffer )
glBufferData( GL_ARRAY_BUFFER, triangle.nbytes, triangle, GL_STATIC_DRAW )

vertex_shader = compileShader( vertex_src, GL_VERTEX_SHADER )
fragment_shader = compileShader( fragment_src, GL_FRAGMENT_SHADER )
shader_program = compileProgram( vertex_shader, fragment_shader )
glUseProgram( shader_program )

glEnableVertexAttribArray( 0 )
glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, triangle.itemsize * 6, ctypes.c_void_p( 0 ) )

when I try to run this program an exception throws.

OpenGL.error.Error: Attempt to retrieve context when no valid context

Process finished with exit code 1

what I’m doing wrong?