A file named numbers.txt contains a unknown number of line, each consisting of single integer. Write some code that opens the file, computes the sum of all integers it contains, and stores the sum in a variable name sum  Below is a code that does not work: sum=open("numbers.txt", "r") number=sum.readline() while line !=" ":          sum+=int(line)          number+=sum.readline() sum.close()

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