CLN: replace %s syntax with .format in pandas.core: categorical, common, config, config_init #17735
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Progress towards #16130
git diff upstream/master -u -- "*.py" | flake8 --diffReplaced
%ssyntax with.formatin pandas.core:categorical.py,common.py,config.py,config_init.py. Additionally, made some of the existing positional.formatcode more explicit.