Can not pass internal test and don't see result of programme.

Question

Hello everyone, help me please. I can not pass internal test and I don't see result of programme.

Text of task:
You are working with the COVID dataset for California, which includes the number of cases and deaths for each day of 2020.
Find the day when the deaths/cases ratio was largest.

To do this, you need to first calculate the deaths/cases ratio and add it as a column to the DataFrame with the name 'ratio', then find the row that corresponds to the largest value.

My code:
import pandas as pd

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

df.drop('state', axis=1, inplace=True)
df.set_index('date', inplace=True)

ratio = df['death']/df['cases']
df['ratio'] = ratio
max_ratio = df['ratio'].max()
print(df[df['ratio'] == max_ratio])

Answer 1

'deaths'

Answer 2

Simba
Thank you very much!
Just I could not see result and did not find this is simple mistake.