python中从文件中读取数据2

#average7.py 文件中有多行，且每行有多个数字用逗号隔开
def main():
fileName = input("What file are numbers in?")
infile = open(fileName,'r')
sum = 0.0
count = 0
line = infile.readline()
while line != "":
#为line中的值更新其count和sum
for xStr in line.split(","):
sum = sum + eval(xStr)
count = count + 1
line = infile.readline()
print("\nThe average of the numbers is ",sum/count)main()