Question

Which character is used at and end of the command in iptyhon to see the documentation of that command ?

Answer 1

Magic command system. IPython will treat any line whose first character is a % as a special call to a 'magic' function. These allow you to control the behavior of IPython itself, plus a lot of system-type features. They are all prefixed with a % character, but parameters are given without parentheses or quotes.