I'm trying to generate a sliding window function in Python. I figured out how to do it but not all inside the function. itertools, yield, and iter() are entirely new to me.
i want to input
a='abcdefg'
b=window(a,3)
print b
['abc','bcd','cde','def','efg']
the way i got it work was
def window(fseq, window_size=5):
import itertools
tentative=[]
final=[]
iteration=iter(fseq)
value=tuple(itertools.islice(iteration,window_size))
if len(value) == window_size:
yield value
for element in iteration:
value = value[1:] + (element,)
yield value
a='abcdefg'
result=window(a)
list1=[]
for k in result:
list1.append(k)
list2=[]
for j in list1:
tentative=''.join(j)
list2.append(tentative)
print list2
basically what im confused about is how to use the final value of the function inside the function?
here is my code for the function
def window(fseq, window_size=5):
import itertools
tentative=[]
final=[]
iteration=iter(fseq)
value=tuple(itertools.islice(iteration,window_size))
if len(value) == window_size:
yield value
for element in iteration:
value = value[1:] + (element,)
yield value
for k in value:
tentative.append(k)
for j in tentative:
tentative_string=''.join(j)
final.append(tentative_string)
return final
seq='abcdefg'
uence=window(seq)
print uence
i want it to return the joined list but when i press run it, it says "There's an error in your program * 'return' with argument inside generator"
I'm really confused . . .
You mean you want to do this ? :
a='abcdefg'
b = [a[i:i+3] for i in xrange(len(a)-2)]
print b
['abc', 'bcd', 'cde', 'def', 'efg']