Dataframes, pandas and computed columns - please point out the error

Question

https://code.sololearn.com/cik50wY5muvZ/?ref=app

Answer 1

import pandas as pd

data = pd.read_csv("/usercode/files/ca-covid.csv")

df = pd.DataFrame(data)

newdf= df.assign(ratio = df["deaths"]/df["cases"])

#Or: newdf = df.assign(ratio = df.deaths/df.cases)

print(newdf)