debug:pandas
Pandas Debugging Guide
A systematic approach to debugging Pandas DataFrames and operations using the OILER framework (Orient, Investigate, Locate, Experiment, Reflect).
Common Error Patterns
1. SettingWithCopyWarning
Symptom: Warning message about setting values on a copy of a slice.
Cause: Modifying a view of a DataFrame rather than a copy. Pandas cannot guarantee whether the operation affects the original data.
Solution:
# BAD - triggers warning
df_subset = df[df['col'] > 5]
df_subset['new_col'] = 10 # Warning!
# GOOD - explicit copy
df_subset = df[df['col'] > 5].copy()
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