Python Programming for Biology: Bioinformatics and Beyond

5

This result is because 2.1 divides 13.3 six times with a remainder that is less than 2.1, or

more precisely, 13.3 = 6.0*2.1 + 0.7.

6

 It  cannot  be  used  for  empty  sets  because  that  notation  instead  means  an  empty

dictionary.

7

They were allowed in Python 2.3 but were not done in the current way until Python 2.4.

8

 The  value  of  an  item  is  converted  via  a  hash  function  into  an  index  that  allows  the

location of the item within a data structure to be determined efficiently, without the need

to  compare  values  with  all  the  other  items.  Hence,  for  this  look-up  to  work,  the  item’s

value must be fixed and thus also its index.

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