[英]error in while loop combined with try-except
如果输入的输入不正确,我想不断要求用户输入文件名。 我已经用不正确的输入(拼写错误的文件名)测试了程序,但没有要求用户重试,而是提示错误消息并且程序终止。 不成功的代码(if 的一部分)如下。 谁能帮我找出问题所在?
import nltk
from nltk.tokenize import word_tokenize
import re
import os
import sys
def main():
while True:
try:
file_to_open = input("insert the file you would like to use with its extension: ")
except FileNotFoundError:
print("File not found.Better try again")
continue
else:
break
with open(file_to_open) as f:
words = word_tokenize(f.read().lower())
with open ('Fr-dictionary2.txt') as fr:
dic = word_tokenize(fr.read().lower())
l=[ ]
errors=[ ]
for n,word in enumerate (words):
l.append(word)
if word == "*":
exp = words[n-1] + words[n+1]
print("\nconcatenation trials:", exp)
if exp in dic:
l.append(exp)
l.append("$")
errors.append(words[n-1])
errors.append(words[n+1])
else:
continue
即使文件系统中不存在路径本身,也可以创建 Path 对象。 在某些时候,在退出 while 循环之前,您需要询问 Path 对象其内部的路径是否存在于文件系统中。 你不需要 try/except 块这样做:
while True:
p = Path(input("please input the path: "))
if p.exists():
break
print("path does not exist, try again")
问题是您正在“保护”简单地询问名称的 while 循环。 您可以改为将读数也放在try
/ except
以处理问题:
while True:
try:
file_to_open = input("insert the file you would like to use with its extension: ")
with open(file_to_open) as f:
words = word_tokenize(f.read().lower())
break
except FileNotFoundError:
print("File not found.Better try again")
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