你能看看我的代码吗，我不知道它有什么问题

Question

fname = input("Enter file name: ")
fh = open("mbox-short.txt")
inp = fh.read()
count = 0
for line in fh:
    line = line.rstrip()
    if not line.startswith("X-DSPAM-Confidence:") :
        continue
    count = count + 1
    c = float(count)
    print(len(inp))
    average = inp / c
print("Average spam confidence:", average)

The code above should write a program that prompts for a file name, then opens that file and reads through the file, looking for lines of the form:

X-DSPAM-Confidence: 0.8475

These lines should be counted and the floating point values from each of the lines extracted to compute the average of those values and produce an output as shown below. How could a possible code look like without the usage of the sum() function or a variable named sum in the solution? What is wrong with my code?

Answer 1

You are trying to iterate over an empty object.

The line inp = fh.read() has exhausted the fh object and it has become set to None