Python 'Tuple' object has no attribute 'has_key' -

i'm running piece of freely available python code used detect cnvs in single cell sequencing data:

#!/usr/bin/env python  import sys  def main():      infilename = sys.argv[1]     outfilename = sys.argv[2]     statfilename = sys.argv[3]      chrominfo = ("/path/hg19.chrom.sizes.txt", 0)     bins = ("/path/hg19.bin.boundaries.50k.bowtie.k50.sorted.txt", 0)     infile = open(infilename, "r")     outfile = open(outfilename, "w")     statfile = open(statfilename, "w")      bincounts = []     in range(len(bins)):         bincounts.append(0)      print len(bincounts)     print len(bins)      counter = 0     totalreads = 0     prevchrompos = ""     x in infile:         arow = x.rstrip().split("\t")         thischrom = arow[2]         thischrompos = arow[3]         if thischrom.find("_") > -1:             #print thischrom             continue         if thischrom == "chrm":             #print thischrom             continue         if thischrom == "":             continue         if chrominfo.has_key(thischrom):             pass         else:             continue          totalreads += 1          thischrominfo = chrominfo[thischrom]         thisabspos = long(thischrompos) + long(thischrominfo[2])          counter += 1          indexup = len(bins) - 1         indexdown = 0         indexmid = int((indexup - indexdown) / 2.0)          while true:             if thisabspos >= long(bins[indexmid][2]):                 indexdown = indexmid + 0                 indexmid = int((indexup - indexdown) / 2.0) + indexmid             else:                 indexup = indexmid + 0                 indexmid = int((indexup - indexdown) / 2.0) + indexdown              if indexup - indexdown < 2:                 break          bincounts[indexdown] += 1         prevchrompos = thischrompos      in range(len(bincounts)):         thisratio = float(bincounts[i]) / (float(counter) / float(len(bins)))         outfile.write("\t".join(bins[i][0:3]))         outfile.write("\t")         outfile.write(str(bincounts[i]))         outfile.write("\t")         outfile.write(str(thisratio))         outfile.write("\n")      bincounts.sort()      statfile.write("totalreads\tmedianbincount\n")     statfile.write(str(totalreads))     statfile.write("\t")     statfile.write(str(bincounts[len(bins)/2]))     statfile.write("\n")      infile.close()     outfile.close()     statfile.close()   def filetodictionary(inputfile, indexcolumn):     input = open(inputfile, "r")      rd = dict() #   input.readline()     x in input:         arow = x.rstrip().split("\t")         id = arow[indexcolumn]         if rd.has_key(id):             #rd[id].append(arow)             print "duplicate knowngene id = " + id             print "arow =   " + str(arow)             print "rd[id] = " + str(rd[id])         else:             rd[id] = arow      input.close()     return(rd)   def filetoarray(inputfile, skipfirst):     input = open(inputfile, "r")      ra = []      in range(skipfirst):         input.readline()      x in input:         arow = x.rstrip().split("\t")         ra.append(arow)      input.close()     return(ra)   if __name__ == "__main__":     main() 

i'm getting error on line 40:

traceback (most recent call last):   file "/path/varbin.50k.sam.py", line 129, in <module>     main()   file "/path/varbin.50k.sam.py", line 40, in main     **if chrominfo.has_key(thischrom): attributeerror: 'tuple' object has no attribute 'has_key'** 

i don't work regularly in python, can offer suggestion? begin?

your code expecting dictionary , getting tuple. think you've missed step: need change

chrominfo = ("/path/hg19.chrom.sizes.txt", 0) 

to

chrominfo = filetodictionary("/path/hg19.chrom.sizes.txt", 0) 

note if dict.has_key(key) has been deprecated in favour of if key in dict.keys()