Python 函数未运行，解释器未给出任何错误

Question

我是 Python 的新手，我在类里面编写的程序有问题。 main() 和 create_file 工作，但是当它到达 read_file 时，解释器只是坐在那里。程序正在运行，但没有任何反应。

答案可能很简单，但我就是看不出来。在此先感谢您的帮助。

我正在使用 IDLE(Python 和 IDLE v. 3.5.2)

代码如下:

import random

FILENAME = "randomNumbers.txt"

def create_file(userNum):

    #Create and open the randomNumbers.txt file
    randomOutput = open(FILENAME, 'w')

    #Generate random numbers and write them to the file
    for num in range(userNum):
        num = random.randint(1, 500)
        randomOutput.write(str(num) + '\n')

    #Confirm data written
    print("Data written to file.")

    #Close the file
    randomOutput.close()

def read_file():

    #Open the random number file
    randomInput = open(FILENAME, 'r')

    #Declare variables
    entry = randomInput.readline()
    count = 0
    total = 0

    #Check for eof, read in data, and add it
    while entry != '':
        num = int(entry)
        total += num
        count += 1

    #Print the total and the number of random numbers
    print("The total is:", total)
    print("The number of random numbers generated and added is:", count)

    #Close the file
    randomInput.close()

def main():

    #Get user data
    numGenerate = int(input("Enter the number of random numbers to generate: "))

    #Call create_file function
    create_file(numGenerate)

    #Call read_file function
    read_file()

main()

Answer 1

函数中有一个无限的 while 循环，因为 entry 在循环期间永远不会改变。

处理文件中所有行的 Pythonic 方式是这样的:

for entry in randomInput:
    num = int(entry)
    total += num
    count += 1