判断文件是否存在

Question

我正在尝试确定文件是否存在，作为 Python 3.7.2 中错误处理过程的一部分。os.path.isfile()然而，作为我尝试使用的过程的一部分，我似乎在 if 语句中遇到了语法错误。我该如何解决这个问题，以便正确读取？代码是：import sysimport osimport randomimport timewhile True:    try:        user_input = input("Enter the path of your file (Remember to include the file name and extension): ")   # Imports user defined file    if os.path.isfile(user_input) == False:        print("I did not find the file at, "+str(user_input)                                                    # Checks if file is present        continue    else:        break编辑：包括错误类型

Answer 1

尝试这个

import sys

import os

import random

import time

while True:

    try:

        user_input = input("Enter the path of your file (Remember to include the file name and extension): ")   # Imports user defined file

        if os.path.isfile(user_input):

            print("I did not find the file at, "+str(user_input))                                                # Checks if file is present

            continue

        else:

            break

    except:

        print('Error')

但是，不需要这么多代码......这就足够了

import sys

import os

import random

import time

while True:

    user_input = input("Enter the path of your file (Remember to include the file name and extension): ")   # Imports user defined file

    if not os.path.isfile(user_input):

        print("I did not find the file at, "+str(user_input))

        continue

    else:

        # some functions

        break

Answer 2

最简单的，因为我不知道你为什么需要一个 try 语句：

import os

path = input("Enter the path of your file (Remember to include the file "

             "name and extension)")

if os.path.exists():

    pass

else:

    print("I did not find the file at, "+str(path))

Answer 3

import os

from builtins import input

while True:

    user_input = input(

        "Enter the path of your file (Remember to include the file name and extension): ")

    if not os.path.isfile(user_input):

        print(f"I did not find the file at {user_input}")

        continue

    else:

        break