I Am Now a Muslim

in_file = "data-small.txt"
out_file = "result-small.txt"
def main(in_file,out_file):
    fin = open(in_file,"r")
    fout = open(out_file,"w")
    valid = 0
    count = fin.readline()
    count = int(count)
    print("Number of items : ",count)
    summary_data = {} #Use a dictonary for the summary data
    for data in fin:
        data = data.split()
        first = int(data[0])
        second = int(data[1])
        i=0
        if ((first > 0) and (first <= count) and (second > 0)):
            print("%5d %10d"%(first,second))
            fout.write("%5d %10d"%(first,second))
            fout.write('\n')
            if first in summary_data.keys(): #first we check if already a item number exists in our dictionary
                summary_data[first]+=second # We then add the order amount to the existing value
            else: # otherwise we insert the order number and order value to the summary data
                summary_data[first]=second
            valid += 1
        elif (first > count):
            print("%5d %10d %s"%(first,second,"invalid item number"))
            fout.write("%5d %10d %s"%(first,second,"invalid item number"))
            fout.write('\n')
        elif (first <= 0):
            print("%5d %10d %s"%(first,second,"invalid item number"))
            fout.write("%5d %10d %s"%(first,second,"invalid item number"))
            fout.write('\n')
        elif (second <= 0):
            print("%5d %10d %s"%(first,second,"invalid quantity"))
            fout.write("%5d %10d %s"%(first,second,"invalid quantity"))
    fout.write("%s %d"%("\nNumber of valid orders =\n",valid))
    print("\nNumber of valid orders =",valid,"\n")
    fout.write("Summary:\n") #summary of the valid orders
    print("Summary:")
    for key,value in sorted(summary_data.items()): #we then iterate the sorted dictionary of sumary data and display records
        fout.write("%5d %10d\n"%(key,value))
        print("%5d %10d"%(key,value))
    fout.close()
    fin.close()
main(in_file,out_file)