Commenting Syntax

Programming

Type	Single Comment	Block Comment
Python	#	""" """
C, C++	//	/* */
Java	//	/* */
Kotlin	//	/* */
Swift	//	/* */
JavaScript	//	/* */
Ruby	#	=begin =end
PHP	/, #	/* */
R	#	x

Markup & Styling

Type	Single & Block Comment
HTML	<!-- -->
CSS	/* */

Database

Type	Single Comment	Block Comment
SQL	--	/* */

Templete Engine

Type	Single Comment
Jinja2 (Flask)	{# #}
Django	{# #}
Liquid (Jekyll)	{%- comment %} {%- endcomment %}
Handlebars (JavaScript)	{{!-- --}}