Page 195 - Data Science Algorithms in a Week

Python Reference

Output:

$ python example06_list.py
The primes less than 10 are: [2, 3, 5, 7]

Set
A set in Python is a non-ordered mathematical set of values.

Input:

# source_code/appendix_c_python/example07_set.py
from sets import Set

boys = Set(['Adam', 'Samuel', 'Benjamin'])
girls = Set(['Eva', 'Mary'])
teenagers = Set(['Samuel', 'Benjamin', 'Mary'])
print 'Adam' in boys
print 'Jane' in girls
girls.add('Jane')
print 'Jane' in girls
teenage_girls = teenagers & girls #intersection
mixed = boys | girls #union
non_teenage_girls = girls - teenage_girls #difference
print teenage_girls
print mixed
print non_teenage_girls
Output:

$ python example07_set.py
True
False
True
Set(['Mary'])
Set(['Benjamin', 'Adam', 'Jane', 'Eva', 'Samuel', 'Mary'])
Set(['Jane', 'Eva'])

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