random_sampler.py

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#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++#
#+++++++++++++++++++Built by Miguel Fernandes Guerreiro+++++++++++++++++++++#
#+++++++++++++++++++++++++++++++++22/05/2017++++++++++++++++++++++++++++++++#
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++#
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'''
sampling iterable objects
'''
from random import randint
from copy import deepcopy
def WithReposition(n,iterable):
   '''subsamples **with** reposition
requires:[iterable: str(), tuple(), list()] and [n: int()] number of samples
to retrieve
ensures:length n list with n random samples from iterable provided
'''
   l = len(iterable)
   k = []

   while n>len(k):
       k.append(randint(0, l-1))

   l = []
   for i in list(k):
       l.append(iterable[i])
   return l

   

def WithoutReposition(n,iterable):
    '''subsamples **without** reposition
requires:[iterable: str(), tuple(), list()] and [n: int()] number of samples
to retrieve
ensures:length n list with n different random samples from iterable provided
'''
    l = len(iterable)
    k = set()

    while n>len(k):
        k.add(randint(0, l-1))

    l = []
    for i in list(k):
        l.append(iterable[i])
    return l


def negativeSampling(sampling,iterable):
   '''subsamples negative of selection list
requires:
   [iterable: str(), tuple(), list()]
   [sampling: tuple(), list()] indexes[int()] *not* to retrieve
ensures:
   collection without indexes present in sampling
'''
   j = deepcopy(list(iterable))
   s = sorted(list(set(sampling)), reverse=True)
   for i in s:
      j.pop(i)
   return j


if __name__=='__main__':
    print('test')
    k = 'asdfg'
    print(WithReposition(4,k))
    print(WithoutReposition(4,k))
    print(negativeSampling((1,4,2,3,9),"0123456789"))