Issue in function cox_time.py

[jensrobben]

Since the release of pandas 2.0.0, the function iteritems is depreciated. (see https://pandas.pydata.org/docs/dev/whatsnew/v2.0.0.html).
Because of this, the function cox_time.py doesn't work anymore, can this be updated?
I cannot give a reproducible example because I worked with the package 'survivalmodels' in R that loads in the cox_time.py function from Python.

[chengzhishi]

I tried two ways and they both seem to be working.

1. downgrade pandas to 1.8
2. Change the data.py by switching iteritems->items