确定文件是否存在

Question

作为python3.7.2中错误处理过程的一部分，我试图确定文件是否存在。作为过程的一部分，我尝试使用os.path.isfile()但是，if语句似乎出现了语法错误。你知道吗

我该如何着手解决这个问题，使其正确阅读？你知道吗

代码是：

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

    else:
        break

编辑：包含错误类型

Answer 1

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

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

试试这个

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')

然而，这许多代码是不需要的。。。 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