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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def render_countryfield(field, attrs):
 	""" 	Render a custom ChoiceField specific for CountryFields. 	"""

	choices = ((k, k.lower(), v)
		for k, v in field.field._choices[1:])

	# Render a `ChoiceField` with all countries
	return render_choicefield(
		field, attrs, format_html_join("", wrappers.COUNTRY_TEMPLATE, choices)
	)