Re-review- Additional Features of ipython

[pritam09]

                                                                       Additional Features of Ipython

Suggestions:-
1. This happens because, when we are running a script and we are not in interactive mode anymore.
-This sentence is confusing please rephrase it.

  2. Please change the spelling of retreive to retrieve in the script.

  3. Please give the instructions of 'hit enter” wherever necessary.

  4. to use %run -i command to run the saved script.
 Every point in summary ends with a command. Rephrase this point accordingly. 

 5.%save filepath 2-5 7 9-11 is the correct option to the specified lines of codes.
   If you are informing the learners about the answer slide, it is not necessary to specify that is the “correct option” in the statement. Please rephrase the statement