python中从文件中读取数据

# average5.py
def main():
    fileName = input("What file are the numbers in?")
    infile = open(fileName, 'r')
    sum = 0
    count = 0
    for line in infile:
        sum = sum + eval(line)
        count = count + 1
    print("\nThe average of the numbers is ",sum/count)
main()


#================= RESTART: C:/Users/home/Desktop/average.py =================
#What file are the numbers in?C:\Users\home\Desktop\python4\num.txt

#The average of the numbers is  10.5

在运行代码时必须将文件的路径以及文件的名称，还有文件的后缀输入。