确定文件是否存在

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')

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

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

最简单的是,因为我不确定您为什么需要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))