Github user Tagar commented on the issue:

    https://github.com/apache/zeppelin/pull/2502
  
    @sanjaydasgupta great job on getting this done.
    ZEPPELIN-1967 was inspired by Jupyter so I just we should do the same as it 
is done there.
    So it's less confusing for users who are switching from Jupyter.
    I would suggest not to use #{...} as it'll be confusing to use this naming 
convention in shell interpreter, for example.
    Escaping should be done similarly like in Jupyter.
    With double curly braces –
    {{ will be escaped to single left curly brace - {
    }} will be escaped to single right curly brace - }
    Thanks!



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