PERF: make Styler default formatter arguments statics instead of repeated dynamic by attack68 · Pull Request #40425 · pandas-dev/pandas (original) (raw)

This PR is a minor fix/improvement to a recent PR which deprecated set_na_rep and set_precision. #40134

For a dataframe with 100,000 floats the current Styler default formatter will make 100,000 get_option lookups for the pandas precision.

Doing this calculation once prevents all these lookups and saves just over 10% render time for larger tables.

rows                       THIS PR   
------ -------------------------
 cols       12          120     
====== ============ ============
  12    11.8±0.2ms   40.8±0.8ms 
  24    22.5±0.3ms    69.2±2ms  
  36    32.3±0.6ms    96.9±1ms  
====== ============ ============

rows                        MASTER         
------ -------------------------
 cols       12          120     
====== ============ ============
  12    12.9±0.4ms    43.4±1ms  
  24    22.3±0.1ms   75.2±0.7ms 
  36    32.3±0.3ms   105±0.5ms  
====== ============ ============