GX not rendering or showing the HTML representation of the Validation Results

GX OSS Support
1

I followed the Quickstart | Great Expectations
This is the script I’m using:

"""Install GX
Run the following command in an empty base directory inside a Python virtual environment:
pip install great_expectations
"""

# Run the following Python code to import the great_expectations module
import great_expectations as gx

# Run the following command to create a Data Context object
context = gx.get_context()

validator = context.sources.pandas_default.read_csv(
    "https://raw.githubusercontent.com/great-expectations/gx_tutorials/main/data/yellow_tripdata_sample_2019-01.csv"
)

# Run the following commands to create two Expectations and save them to the Expectation Suite
validator.expect_column_values_to_not_be_null("pickup_datetime")
validator.expect_column_values_to_be_between(
    "passenger_count", min_value=1, max_value=6
)
validator.save_expectation_suite()

# Run the following command to define a Checkpoint and examine the data to determine if it matches the defined Expectations
checkpoint = context.add_or_update_checkpoint(
    name="my_quickstart_checkpoint",
    validator=validator,
)

# Run the following command to return the Validation Results
checkpoint_result = checkpoint.run()

# Run the following command to view an HTML representation of the Validation Results in the generated Data Docs
context.view_validation_result(checkpoint_result)

This is the output:

Jorge@DESKTOP-HFQR414 MINGW64 ~/git/great-expectations (main)
$ python app.py
Calculating Metrics: 100%|██████████████████████████████████████████████████████████████| 6/6 [00:00<00:00, 857.44it/s]
Calculating Metrics: 100%|██████████████████████████████████████████████████████████████| 8/8 [00:00<00:00, 515.22it/s]
Calculating Metrics: 100%|████████████████████████████████████████████████████████████| 15/15 [00:00<00:00, 526.09it/s]

But then it fails to render or open the results page:

2023-12-06 12_11_06-Epic Pen Content Surface_ __._DISPLAY3
2023-12-06 12_11_06-Epic Pen Content Surface_ __._DISPLAY31362×667 27.3 KB

I installed jupyter notebooks on my virtual environment (virtualenv) using this command:

python -m pip install jupyter

I tried again to no avail.

I’m using Python 3.12 on Windows 10 now, but I also tried with python 3.11 and failed just the same.
Do I need macOSX or is GX compatible with windows 10 and Python 3.12?

I don’t know what am I doing wrong.

2

It might be that you are running into the maximum file path length of windows

1 Like
3

As @Tim said, this might be due to the file path length limitations in Windows.
Check if this is the case. Go to the file location (AppData/Local/…), copy the HTML-file to your desktop (or wherever), and open it from there.
If it opens up just fine, great!
In that case, consider setting up a Filesystem Data Context, it should make the path shorter.
Run great_expectations init in your project folder to automatically do this.