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pandas-use-of-dot-stack (PD013)#

Derived from the pandas-vet linter.

What it does#

Checks for uses of .stack on Pandas objects.

Why is this bad?#

Prefer .melt to .stack, which has the same functionality but with support for direct column renaming and no dependence on MultiIndex.

Example#

import pandas as pd

cities_df = pd.read_csv("cities.csv")
cities_df.set_index("city").stack()

Use instead:

import pandas as pd

cities_df = pd.read_csv("cities.csv")
cities_df.melt(id_vars="city")

References#