__file__ does not exist in Jupyter Notebook

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I"m on a Jupyter Notebook server (v4.2.2) with Python 3.4.2 and I want to use the global name __file__, because the notebook will be cloned from other users and in one section I have to run:

def __init__(self, trainingSamplesFolder="samples", maskFolder="masks"):
    self.trainingSamplesFolder = self.__getAbsPath(trainingSamplesFolder)
    self.maskFolder = self.__getAbsPath(maskFolder)

def __getAbsPath(self, path):
    if os.path.isabs(path):
        return path
    else:
        return os.path.join(os.path.dirname(__file__), path)

The __getAbsPath(self, path) checks if a path param is a relative or absolute path and returns the absolute version of path. So I can use the returned path safely later.

But I get the error

NameError: name "__file__" is not defined

I searched for this error online and found the "solution" that I should better use sys.argv[0], but print(sys.argv[0]) returns

/usr/local/lib/python3.4/dist-packages/ipykernel/__main__.py

But the correct notebook location should be /home/ubuntu/notebooks/.

Thanks for the reference How do I get the current IPython Notebook name from Martijn Pieters (comments) the last answer (not accepted) fits perfect for my needs:

print(os.getcwd())

/home/ubuntu/notebooks

👻 Read also: what is the best laptop for engineering students?

__file__ does not exist in Jupyter Notebook absolute: Questions

How to get an absolute file path in Python

3 answers

izb By izb

Given a path such as "mydir/myfile.txt", how do I find the file"s absolute path relative to the current working directory in Python? E.g. on Windows, I might end up with:

"C:/example/cwd/mydir/myfile.txt"
877

Answer #1

>>> import os
>>> os.path.abspath("mydir/myfile.txt")
"C:/example/cwd/mydir/myfile.txt"

Also works if it is already an absolute path:

>>> import os
>>> os.path.abspath("C:/example/cwd/mydir/myfile.txt")
"C:/example/cwd/mydir/myfile.txt"

__file__ does not exist in Jupyter Notebook absolute: Questions

How to check if a path is absolute path or relative path in a cross-platform way with Python?

3 answers

UNIX absolute path starts with "/", whereas Windows starts with alphabet "C:" or "". Does python have a standard function to check if a path is absolute or relative?

175

Answer #1

os.path.isabs returns True if the path is absolute, False if not. The documentation says it works in windows (I can confirm it works in Linux personally).

os.path.isabs(my_path)

__file__ does not exist in Jupyter Notebook absolute: Questions

How to join absolute and relative urls?

3 answers

I have two urls:

url1 = "http://127.0.0.1/test1/test2/test3/test5.xml"
url2 = "../../test4/test6.xml"

How can I get an absolute url for url2?

139

Answer #1

You should use urlparse.urljoin :

>>> import urlparse
>>> urlparse.urljoin(url1, url2)
"http://127.0.0.1/test1/test4/test6.xml"

With Python 3 (where urlparse is renamed to urllib.parse) you could use it as follow:

>>> import urllib.parse
>>> urllib.parse.urljoin(url1, url2)
"http://127.0.0.1/test1/test4/test6.xml"

We hope this article has helped you to resolve the problem. Apart from __file__ does not exist in Jupyter Notebook, check other absolute-related topics.

Want to excel in Python? See our review of the best Python online courses 2022. If you are interested in Data Science, check also how to learn programming in R.

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Cornwall Sikorski

Abu Dhabi | 2022-12-05

Maybe there are another answers? What __file__ does not exist in Jupyter Notebook exactly means?. Checked yesterday, it works!

Marie Chamberlet

Abu Dhabi | 2022-12-05

Thanks for explaining! I was stuck with __file__ does not exist in Jupyter Notebook for some hours, finally got it done 🤗. I just hope that will not emerge anymore

Boris Chamberlet

Tallinn | 2022-12-05

Thanks for explaining! I was stuck with __file__ does not exist in Jupyter Notebook for some hours, finally got it done 🤗. Will get back tomorrow with feedback

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