当循环不断崩溃时

Question

我是Python新手，在大学学习网络安全时，我只做了一点工作。我正试着写一个工作（个人使用）的小脚本。代码不会循环并且不断崩溃，有人能帮忙吗

"""
Created on Fri Apr 16 10:28:50 2021

@author: lukem
"""

import datetime
from datetime import *
import sys

print("Commercial Divers Work Hours")
while True:
    while True:
        
                DT1 = input("Is it todays date?:").lower()
                
            
                if DT1 == 'n' or DT1 == 'N':
                   DT2 = input("Enter Date?")
                
                elif DT1 == 'Y' or DT1 == 'y':
                      print(datetime.now())
                      
               
                
                   
                shrs = int(input("Start Time?:"))
                fhrs = int(input("Finish time?:"))
                thrs = int(input("Travel time?:"))
                job = input("At what Job?:")
                dp = input("Depth pay? How many meters?:")
                wd = input("Welding allowance? y/n:")
                    
                    
                if wd == 'y':
                
                    wd1 =  int(input("How Many Millimeters?:"))
                 
                    
                elif wd == 'n':
                    print("0")
                    break 
                                     
    
                 
                if DT1 == 'Y' or  DT1 == 'y':
                 
                   print("Date: ",datetime.now())
                   print("Start Time: ",shrs)
                   print("Finish Time: ",fhrs)
                   print("Travel Time: ",thrs)
                   print("Job or Client: ",job)
                   print("Depth Allowance in meters: ",dp)
                   print("Welding allowance in mm: ", wd1)
                   
                elif DT1 == 'n' or DT1 == 'N':
                    
                   print("Date: ",DT2)
                   print("Start Time: ",shrs)
                   print("Finish Time: ",fhrs)
                   print("Travel Time: ",thrs)
                   print("Job or Client: ",job)
                   print("Depth Allowance in meters: ",dp)
                   print("Welding allowance in mm: ", wd1)
                        
                        
                   
                    
                   
                file = open('Workhours7y.txt' , 'a')
                sys.stdout = file 
                      
                if DT1 == 'Y' or  DT1 == 'y':
                     
                       print("Date: ",datetime.now())
                       print("Start Time: ",shrs)
                       print("Finish Time: ",fhrs)
                       print("Travel Time: ",thrs)
                       print("Job or Client: ",job)
                       print("Depth Allowance in meters: ",dp)
                       print("Welding allowance in mm: ", wd1)
                       
                elif DT1 == 'n' or DT1 == 'N':
                        
                       print("Date: ",DT2)
                       print("Start Time: ",shrs)
                       print("Finish Time: ",fhrs)
                       print("Travel Time: ",thrs)
                       print("Job or Client: ",job)
                       print("Depth Allowance in meters: ",dp)
                       print("Welding allowance in mm: ", wd1)
                
                file.close()
                
                Continue
            

Answer 1

不要使用sys.stdout=file。 在结束时关闭文件，当循环从头开始时，仍然尝试打印到关闭的文件，这不起作用，因为它已关闭

使用单独的命令写入文件

Answer 2

出现此错误是因为您使sys.stdout指向file，然后关闭file。问题是，print写入sys.stdout指向的任何文件，但您已经关闭了该文件

去掉sys.stdout = file行，或者更改print以使用file参数：

print("Date: ",DT2, file=file)

或者，直接写入文件：

file.write(f"Date: {DT2}\n")