I hust wrote this code for below question and I get an error as shown at the botton of the attached $"$ Expected var, std$,$ iqr to be defined" kindly advise how can I define these?

Calculate the variance, standard deviation and interquartile range of this field, save them as var, std and iqr

respectively and print them.

import numpy as np

import pandas as pd

'candy$-$data.csv$\text{'})$

var 'winpercent'$])$

std $=$ np$.$std$($df$[$ 'winpercent'$])$

q$1=$ np$-$percentile$($df$[\text{'}$winpercent$\text{'}],25)$

q$3=$ np$.$percentile$($df$[\text{'}$winpercent$\text{'}],75)$

iqr$\_$value $=q3-q1$

print$("$Variance:$",$ var$)$

print$("$Standard Deviation:", std$)$

print$("$Interquartile Range $($IQR$)$:$",$ iqr$\_$value$)$

Expected var, std and iqr to be defined.