python - Array sizes being added instead of staying constant -


i wish add contents of multiple arrays in single array, go on different files store data in array , add them, data seems getting appended rather being added. example want, a=[1,2,3,4], b=[2,3,4,5],c=[3,4,1,2] , final array sum=[6,9,8,11]. reason not able perform operation! know stupid mistake somewhere!

x=[] s=[] s=[] p=[] p=[] d=[] d=[] #print 'starts0 %f' % s[0]      #print 'starts1 %f' % s[1]       n=3 in xrange(1,n+1,1):         stri = str(i)         dos_file =open("dos"+stri,"r")         #dos_file =open("dos1","r")         print 'filename %s' % dos_file         line_aa in dos_file.readlines():                 line_aa=line_aa.split()                 #x=[0]*1000                 #p=[0]*1000                 x.append(line_aa[0])                 s.append(line_aa[1])                 #p.append(line_aa[2])                 #d.append(line_aa[3])         #dos_file.close()            x=[float(i) in x]         s=[float(i) in s]         print 's0 %f' % s[998]         print 's1 %f' % s[999]         sizes=len(s)         print 'sizes %d' % sizes         s=[0]*sizes         print 's0 %f' % s[0]         print 's1 %f' % s[1]         sizes=len(s)         print 'sizes %d' % sizes         #dos_file.close()            s_tot=[a + b a, b in zip(s, s)]         print 's_tot0 %f' % s_tot[0]         print 's_tot1 %f' % s_tot[1]         sizes_tot=len(s)         print 'sizes_tot %d' % sizes_tot         dos_file.close()         #x=[0]*sizes         #p=[0]*sizes  print 'ends0 %f' % s_tot[0] print 'ends1 %f' % s_tot[1]

the result is:

filename <open file 'dos1', mode 'r' @ 0x2aaaabe06540>  sizes 1000  sizes 1000  sizes_tot 1000 filename <open file 'dos2', mode 'r' @ 0x2aaaabe065d0>  sizes 2000  sizes 2000  sizes_tot 2000 filename <open file 'dos3', mode 'r' @ 0x2aaaabe06540>  sizes 3000  sizes 3000  sizes_tot 3000

the operation want this:

a = [1, 2, 3, 4] b = [2, 3, 4, 5] c = [3, 4, 1, 2] print([sum(items) items in zip(a, b, c)])

results in

[6, 9, 8, 11]

here, i'm using list comprehension, sum, , zip.


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