#This class can be used to call list methods reverse/sort/extend/append/remove etc
#on list/tuple/strings. As the function of this class return the
#modified sequence instead of modifying them(that anyway it can't do)
#it may be used in map/reduce functions
#functions can be called
#directly from module NIPSeqMethods (or whatever name u give to this file , btw NIP is not in place)
# e.g NIPSeqMethods.reverse('python')
#or user can import rquired functions e.g
#from NIPSeqMethods import reverse,intersperse,sort
class SeqMethods:
def __init__(self,funcName=None):
self.funcName = funcName
def __call__(self,*args):
if args:
#convert to list
l,t = self.SeqToList(args[0])
#do list operation
ret = apply(getattr(l,self.funcName),args[1:])
if ret:
return ret
#convert to seq
return self.ListToSeq(l,t)
def SeqToList(self,o):
t = type(o)
if t in [type(''),type(()),type([])]:
return list(o),t
return [],t
def ListToSeq(self,l,t):
if t == type(''):
return ''.join(l)
if t == type(()):
return tuple(l)
return l
def __getattr__(self,name):
return SeqMethods(name)
#additional methods
#this will mix to sequences and create a new sequence
#whose 1st element is from first list,2nd elem from second list
#3rd from first and 4th from second list and so on...
#type of returned seq. = type of first sequence
def intersperse(self,seq1,seq2):
l1,t1 = self.SeqToList(seq1)
l2,t2 = self.SeqToList(seq2)
if len(l1) < len(l2):
length = len(l1)
else:
length = len(l2)
#get mixed list
l = []
for i in xrange(length):
l.append(l1[i])
l.append(l2[i])
l.extend(l1[length:])
l.extend(l2[length:])
return self.ListToSeq(l,t1)
thisMod = __import__(__name__)
sm = SeqMethods()
listMethods = [].__methods__
myMethods = ['intersperse']
#this will add all list type methods and other
#additional methods to module dictionary
for method in listMethods + myMethods:
thisMod.__dict__[method] = getattr(sm,method)
if __name__ == '__main__':
#examples
print reverse(intersperse(('a','c','e','g','i'),'bdfh'))
print map(sort,((2,1,3),(4,3,5)))
print extend((2,1,3),(4,3,5))
print remove('python','p')
print insert('python',1,'A')
