The task is to check whether a file exists or not?

任务是检查文件是否存在 ？

Before continuing to the tutorial, please note that – there are some of the separate functions which are used to check whether a file or directory exists or not. So you have to make sure what you want to check a file or a directory.

在继续学习本教程之前，请注意–有一些单独的函数用于检查文件或目录是否存在 。 因此，您必须确定要检查文件或目录的内容。

To use the functions, we have to import the "os" module, the functions are:

要使用这些功能，我们必须导入“ os”模块，这些功能是：

1. os.path.isfile(): To check whether a file exists or not.

   os.path.isfile() ：检查文件是否存在。

2. os.path.isdir(): To check whether a directory exists or not.

   os.path.isdir() ：检查目录是否存在。

3. os.path.exists(): To check for both either a file or a directory.

   os.path.exists() ：检查文件还是目录。

So, if you are not sure about the file or directory, I would recommend using "os.path.exists()" function to avoid the error.

因此，如果不确定文件或目录，建议使用“ os.path.exists()”函数来避免该错误。

Example:

例：

In this example, we are checking a file "file.txt" and if it does not exist, we will create and close the file and then again check for the same file.

在此示例中，我们正在检查文件“ file.txt” ，如果该文件不存在，则将创建并关闭该文件，然后再次检查同一文件。

# import statementimport os# checking fileif not(os.path.exists("file.txt")):	print("File does not exist")	# creating & closing file 	fo = open("file.txt","wt")	fo.close();else:	print("File exists")# checking againif os.path.exists("file.txt"):	print("Now, file exists")else:	print("File does not exist")

Output

输出量

File does not existNow, file exists

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