iloc[ ] method of Pandas library means code example
Example 1: iloc in dataframe
df=pd.read_csv('yourcsv.csv')
X=df.iloc[:,:-1].values
y=df.iloc[:,1].values
Example 2: iloc python
>>> df.iloc[[0, 1]]
a b c d
0 1 2 3 4
1 100 200 300 400