Issue generating deprecation warning

I am a frappe developer and am trying to create a deprecation warning in frappe codebase
branch : develop

from frappe.deprecation_dumpster import deprecation_warning

deprecation_warning(
	marked="unknown",
	graduation="v17",
	msg="The `wide` parameter has no effect and is deprecated",
)

and below to force showing warning

export PYTHONWARNINGS=“always:frappe.deprecation_dumpster.PendingFrappeDeprecationWarning”

Deprecation Wiki

After this bench start does not work
Is this a frappe issue or something I am doing wrong?