When importing a module without null bytes I get ValueError: source code string cannot contain null bytes

Question

Python isn't importing modules!

marketing
    ├───__init__.py
    ├───analyzation\
    │   ├───__init__.py
    │   ├───analyzer.py
    ├───api\
    ├───test\
    │   ├───test_res\ (not important)
    │   ├───__init__.py
    │   ├───test_analyzer.py

Above is my folder structure. So, in analyzer.py I have a class DataSet and nothing else other than some imports from pandas and an import in a method import random.

In test_analyzer.py I have a class that subclasses unittest.TestCase. This script tries to test the following class being imported: import marketing.analyzation.analyzer (which doesn't work). The error message is the following:

Traceback (most recent call last):
  File ".\test_analyzer.py", line 1, in <module>
    import marketing.analyzation.analyzer
ValueError: source code string cannot contain null bytes

Just to make sure it wasn't some dumb vim error, I retyped analyzer.py. Spent at least 2 hours trying to fix this, and another hour surfing stackoverflow and googling, but so far I've come up with nothing. Is it because test_analyzer.py is in its own submodule?

Thanks~~~

Probably dupe of stackoverflow.com/questions/31233777/… but I can't verify now. — Dimitris Fasarakis Hilliard
– Dimitris Fasarakis Hilliard, Commented Jul 31, 2017 at 23:52
@matt961: If you rename analyzer.py to analyzer2.py (without changing the import), does the error change? — Ry-
– Ry- ♦, Commented Jul 31, 2017 at 23:55
Are you doing this under Windows? Did you use Notepad? It smells like the file was saved as Unicode rather than plain ole ASCII. — John Szakmeister
– John Szakmeister, Commented Aug 1, 2017 at 0:19

matt961 · Accepted Answer · 2017-08-01 00:25:30Z

0

Don't use powershell to create files being read by python. Used Vim to create __init__.py files instead. Thanks commenters.

answered Aug 1, 2017 at 0:25

matt961

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Comments

feeeper · Accepted Answer · 2020-05-28 07:18:21Z

0

I had similar problem with pytest.

In my case the problem was in __init__.py: the file was created in UTF-16 encoding. I changed encoding to UTF-8 and the problem disappeared.

answered May 28, 2020 at 7:18

feeeper

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