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jmsdnns/isitfluent.py

Created September 17, 2024 06:13
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Fluent interfaces technically return self or this from each chained function. Pandas returns new instances of the same type. Technically, that isn't fluent. I suspect it is meant to be indistinguishable for optimization reasons.
Raw
isitfluent.py
#!/usr/bin/env python
import pandas as pd
def getDataframe(url_table, ind):
df = pd.read_html(url_table)[ind]
return df
# Chaining functions
df = (
getDataframe("https://en.wikipedia.org/wiki/Historical_population_of_Ireland", 1)
.drop(columns=["Rank"])
.rename(columns=lambda x: x.lower())
.query("province == 'Leinster'")
.sort_values("density (/ km2)", ascending=True)
)
print(df)
# But, is this a fluent interface? It creates new objects each time
df = getDataframe("https://en.wikipedia.org/wiki/Historical_population_of_Ireland", 1)
print(id(df))
df = df.drop(columns=["Rank"])
print(id(df))
df = df.rename(columns=lambda x: x.lower())
print(id(df))
df = df.query("province == 'Leinster'")
print(id(df))
df = df.sort_values("density (/ km2)", ascending=True)
print(id(df))
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