CODEWITHSUNDEEP
python
LearningNoob
LearningNoob

Reputation: 700

How do I handle the exception if one or two files don't exist?

I'm trying to check if one or two files exist like this:

def check_files_if_exist():
    try:
        f1 = open(file1)
        f1.close()
        f2 = open(file2)
        f2.close()
    except:
        #how to pass exception if one or two files does not exist?

My question is how do I pass an exception if of one or both files does not exist?

Upvotes: 2

Views: 1953

Answers (4)

ramwin
ramwin

Reputation: 6276

def check_files_if_exist():
    try:
        f1 = open(file1)
        f1.close()
        f2 = open(file2)
        f2.close()
    except:
        pass  # if you want to stop the whole function, you can use "return False" here.

I don't know the scenario of the author. If you want to just stop the function, you can use return False. But if you still want to execute some function even the file1 and file2 doesn't exists, you can use pass to ignore the exception.

Upvotes: 0

liaofeng
liaofeng

Reputation: 82

use os.path.isfile(path) to check whether file exists, without any exception.

import os

def check_files_if_exist(path1, path2):
  return os.path.isfile(path1) and os.path.isfile(path2)

or

import os

def check_files_if_exist(*paths):
  return all(os.path.isfile(path) for path in paths)

Upvotes: 0

Joel
Joel

Reputation: 1574

If you don't want to use os.path.exists() or os.path.isfile() from the built-in os.path module, you'll have to use two try-except blocks:

def check_files_if_exists(...):
    try:
        f1 = open(...)
        f1.close()
    except:
        return False # Return False because the path doesn't exist
    try:
        f2 = open(...)
        f2.close()
    except:
        return False # Return False because the path doesn't exist
    return True # This only occurs when both files exist.

Upvotes: 0

Alex
Alex

Reputation: 7045

You can directly check if a file exist by using the pathlib.Path module. It comes with python.

from pathlib import Path
p = Path('/path/to/file.txt')
if p.exists():
    # open file...
    with p.open('r') as file:
        for line in file:
            line = line.strip()
            # Do something here...

Upvotes: 1

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