Numbers in three different formats

I am working with a dataset; below you can see a small example.

import pandas as pd
import numpy as np

data = {
         'id':['9.','09', 9],
        }
df = pd.DataFrame(data, columns = [
                                      'id',])

df['id'] = df['id'].replace(".","")


df

In this data set, one number is written in three ways e.g '9.','09', 9
Now I want to have all of these numbers written in the same way e.g 9, without . or 0

I tried with this line of code but it is not working

df['id'] = df['id'].replace(".","")

So can anybody help me how to solve this problem?

>Solution :

try this:

pd.to_numeric(df['id'])

0    9.0
1    9.0
2    9.0
Name: id, dtype: float64

to int:

pd.to_numeric(df['id']).astype(int)

0    9
1    9
2    9
Name: id, dtype: int64