# Write a program in Python to filter only integer elements in a given series

Input − Assume you have the following series −

0    1
1    2
2    python
3    pandas
4    3
5    4
6    5

Output − The result for only integer elements are −

0    1
1    2
4    3
5    4
6    5

## Solution 1

• Define a Series.

• Apply lambda filter method inside a regular expression to validate digits and expression accepts only strings so convert all the elements into strings. It is defined below,

   data = pd.Series(ls)
result = pd.Series(filter(lambda x:re.match(r"\d+",str(x)),data))
• Finally, check the values using the isin() function.

### Example

Let us see the following implementation to get a better understanding.

import pandas as pd
ls = [1,2,"python","pandas",3,4,5]
data = pd.Series(ls)
for i,j in data.items():
if(type(j)==int):
print(i,j)

### Output

0    1
1    2
4    3
5    4
6    5

## Solution 2

### Example

import pandas as pd
import re
ls = [1,2,"python","pandas",3,4,5]
data = pd.Series(ls)
result = pd.Series(filter(lambda x:re.match(r"\d+",str(x)),data))
print(data[data.isin(result)])

### Output

0 1
1 2
4 3
5 4
6 5