use iloc in pandas 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 pandas

Purely integer-location based indexing for selection by position.

.iloc[] is primarily integer position based (from 0 to length-1 of the axis), but may also be used with a boolean array.

Example 3: return df.iloc[1:]

>>> df.iloc[1:3, 0:3]
      a     b     c
1   100   200   300
2  1000  2000  3000

Example 4: X = df.iloc[:, 1:]

X = df.iloc[:, 1:]