Debugging Missing Data Behind a NoneType get_value Error

Summary

This brief troubleshooting note links a Python-style NoneType error from a BigQuant experiment to a likely missing data record. It recommends printing the security identifier and date associated with the failure, then checking whether data exists for that security on that day. The reported cause was that the security had not been subscribed to, so the expected object was absent when the code tried to access its value.

The advice is a targeted diagnostic for this particular error report, not a general explanation of NoneType exceptions or a complete debugging procedure. It does not describe subscription setup, show code, or establish whether the same cause applies in other cases. Its useful takeaway is to verify both the identifier-date pair and data subscription when a lookup unexpectedly returns no object.

Key ideas

• A NoneType get_value error can occur when the expected security data object is missing.
• Print the security identifier and date to locate the failing observation.
• Check whether the security has data for that date and whether it was subscribed to.
• The note reports a missing subscription as the cause in this case.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.