Error open file invalid argument

[Solved] OSError errno22 invalid argument

An error is a problem in python incurred while compiling the code. For example, an error is raised when python cannot understand a given code because it failed to adhere to the syntax. There are several types of error in python, such as SyntaxError, RuntimeError, IndentationError, etc. OSError errno22 invalid argument is one such type of python error. We will first understand each of the components of the error separately.

What is OSError?

OSError is the type of error in OSError : [errno22] invalid argument. OSError is an error class for the OS module. It is a built-in exception in python, which is raised. It is raised when the error occurs due to some system failure. I/O failures also give rise to OSErrors.

When the disk is full, or the file cannot be found, OSError is raised. The subclasses of OSError are BlockingIOError, ChildProcessError, ConnectionError, FileExistsError, FileNotFoundError, etc. OSError itself is derived from the EnvironmentError.

What is errorno22 invalid argument?

As the name suggests, invalid argument errors occur when an invalid argument is passed to a function. If a function was expecting an argument of a particular data type but instead received an argument of a different data type, it will throw an invalid argument error.


The above code will raise invalid argument error.

The tf.reshape() function was expecting a tensor as an argument. But instead, it received 1 and 2 as the argument.

‘OSError : [errno22] invalid argument’ while using read_csv()

Read_csv() is a function in pandas which is used to read a csv file in python. We can read a csv file by accessing it through a URL or even locally. While reading a csv file using read_csv, python can throw OSError : [errno22] invalid argument error.

Let us try to understand it with the help of an example. The below code has been executed in python shell to access local files. First, we shall import the pandas file to use read_csv()

Now, we shall try to access a csv file.

The above line of code will raise the below error.

The reason behind the error is that python does not consider the backslash. Because of that, it showed oserror invalid argument. So what we have to do is that instead of a backslash, we have to replace it with a forwarding slash.

Th error has been resolved now.

‘OSError : [errno22] invalid argument’ while using open()

We can get OSError : [errno22] invalid argument error while opening files with the open() function. The open() function in python is used for opening a file. It returns a file object. Thus, we can open the file in read, write, create or append mode.

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Let us understand the error by taking an example. We shall try to open a .txt file in read mode using open(). The file would be returned as an object and saved in variable ‘f’.

The code will throw the below error.

The OSError : [errno22] invalid argument error has been thrown because of the same reason as before. Here also, python fails to recognize the backslash symbol. On replacing backslash with forward slash, the error will be resolved.

‘OSError : [errno22] invalid argument’ while reading image using open()

The above error can appear while opening an image using the open() function even though the backslash character has been replaced with forward slash. Let us see the error using an example.

The error thrown would be:

This error mainly occurs because of the copying of the file path. The Unicode characters also get copied sometimes when we copy the file path from our local system or the internet.

The Unicode character, ‘\u202a’ in the above example, is not visible in the file pathname. ‘\u202a’ is the Unicode control character from left to right embedding. So, it causes the above oserror invalid arguments.

The solution to this is straightforward. We simply have to type the URL manually instead of copying it. Thus, the Unicode character will no longer be in the URL and the error will be resolved.

As seen above, initially the program was showing an error because the Unicode character was present even though it was not visible. But, the error gets resolved when the second time the same code was typed manually.

‘OSError : [errno22] invalid argument’ while reading image using savefig()

Savefig() function in python is used to save an image locally, which has been plotted using the matplotlib library. It is accessed using plt.savefig().

While using savefig() function, OSError : [errno22] invalid argument error can also occur. This error too occurs due to the same reasons as mentioned above. When we try to save the image file, we must ensure that the file is not saved with colons, brackets, or backslash.

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Doing so will raise the oserror. Next, check if the file is not saved with those characters and remove them if they are present. This shall resolve the error.

Q. What is oserror: (errno 22) invalid argument datetime?

A. The datetime module in python is a module that is used for manipulating date and time. OSError: (errno 22) invalid argument datetime occurs when we are using fromtimestamp. Checking the units will solve the error.

Q. What is oserror: (errno 22) invalid argument saving the file?

A. The OSError: (errno 22) invalid argument occurs may also occur when one is trying to save a file. For example: adding an unnecessary semicolon to the filename also causes the error. It is because windows do not allow semi-colons in file names.

That was it for OSError: (errno 22) invalid argument. If you have anything to share, we would love to hear about it in the comments. Keep learning because you can never learn enough!


Invalid argument error when saving a loaded dataframe #170


(I am sure that this problem comes just because I am a noob but I don’t really know what to do with it so please bear with me. )

The last line gives me error:
SystemError: opening file pnjunction_simulations.tsv: Invalid argument

(P.S.: If there is a more «standard» way to add rows to a dataframe, besides this vcat I am doing, you are welcomed to let me know)

The text was updated successfully, but these errors were encountered:

Weird: changing the file extention to .csv worked, even when using \t as a delimter.

Sounds really weird. What happens if you try with different file names, different extensions, different paths?

I won’t have time to debug it, sorry 🙁

It worked after I changed the file extention, and now I just went with it.

the problem is even worse actually.

  1. Why did this issue close? The issue was not a mistake. It clearly happened to me, I wasn’t lying.
  2. It now happened again, with .csv ending instead.

Could it be that somehow «occupies the file» so it can’t be saved at the same name?

I’ve noticed that doesn’t matter what file type I have, if I do:

and then modify data and try to do

it gives me the error

I am on Windows 10, Julia 0.6.2. All packages on their latest stable version.

The file I read is inside a syncing folder like Google Drive or ownCloud. I cannot imagine how it should be related however.

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I closed the issue because you said you didn’t have time to investigate it, and since we had no way to reproduce it.

It looks like the file isn’t properly closed by , which prevents further modifications. Indeed the function does not call close on the file. @quinnj Is this intentional?

As a workaround, you can open the file manually using open , pass the resulting stream to , and close it manually.

This is a windows-only issue; you can do; use_mmap=false) and should be able to write to the same filename afterwards just fine. Alternatively, I think you can also do df =; gc(); gc(); CSV.write(file, df) and that should work too.

You are right, using

Is there any chance you can «fix» this, in the sense that I actually won’t have to use the suggestions of quinnj or the fix by nalimilan?

From a users perspective any function that has » read » as its name should leave the file alone after reading it. Maybe modify to not use use_mmap by default on windows?

@quinnj Is there any reason not to call close from inside ?

I’m not sure what you mean. The error here is that when you Mmap.mmap(file) on windows, it’s invalid to try and write to that file until it’s «mapping» is completely closed (i.e. the mmapped array is finalized). This is in contrast to unix, where writing to an mmapped file is allowed. So there’s nothing to close. I guess maybe we could try and call finalize on the array at the end of ? But then we might run into corruption issues if people are counting on accessing that byte array or anything.

Ah, I forgot that the columns are mmaped. I think by default we should do something safe and convenient, so if that means not using mmap on Windows or copying the array once it’s been parsed, let’s do that. Parsing a CSV file shouldn’t require so much thought, or we’re going to look bad compared with other languages.

+1 for making sure this doesn’t require a workaround on Windows 10.
It is a very common use case — open CSV, modify, save. And it is difficult to figure out the solution from the error message.


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