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Can't escape the period in "" in exercise 12 Pandas Summary Challenge

print (big_movers) ```

What I expected to happen:

Get a list output

What actually happened: ```wrap your code in triple backticks``` to format properly
``` File "<ipython-input-1-8cbac3f88871>", line 1
    big_movers = f_500[["Aviva","HP,"","BHP Billiton"],["rank","previous_rank"]]
SyntaxError: invalid syntax```

I think the period in caused the code to crash...I"m not sure how to override/escape the period
Other details:

It looks like you didn’t close the quotes on HP. It’s using the beginning quotes from as the ending quote for HP, which then trickles on down the line.

This came in handy today, thanks.