No option to specify a custom nullMarker while using table.upload_from_file method

[HassanJaveed84]

We have source data where Null values are represented by \N.

However, we're unable to use table.upload_from_file method as there is no parameter to specify a custom null marker(configuration.load.nullMarker).

[tseaver]

@HassanJaveed84 Thanks for the report. If you would care to prepare a pull request patching the table.py module, it would land more quickly. Looking at the code, it would need a new null_marker argument to Table.load_from_file, which would then get passed down to the _configure_job_metadata helper. The PR would also need to update one of the tests to demonstrate passing the value.

[HassanJaveed84]

@tseaver I'll go ahead and create a PR, thanks!

[HassanJaveed84]

@tseaver I tried following the instructions for local development on:
https://github.com/GoogleCloudPlatform/google-cloud-python/blob/master/CONTRIBUTING.rst

However, I'm unable to run the tests using the given instructions.
"To run all tests for google-cloud-python on a single Python version, run py.test from your development virtualenv "

Not sure about py.test ?

[dhermes]

@HassanJaveed84 sorry CONTRIBUTING is very out of date (/cc @lukesneeringer).

Instead, install nox via:

pip install --upgrade nox-automation

then run nox in the bigquery directory:

$ cd path/to/git/repo/
$ cd bigquery/
$ nox -l  # list of tests
$ nox -s "unit_tests(python_version='3.6')"  # One test
$ nox  # All tests, though you probably don't want system tests

[HassanJaveed84]

Thanks @dhermes.
I'll let you know if I run into problems again.
I also found that client.load_table_from_storage does not accept a null_marker value.
I'll try to address both of these issues.