str.isalpha() returning NaN instead of bool values
# importing pandas module 
import pandas as pd

#creating list
data=["gfg",2,"geeks","pandas",4,"python",5.6,"data analysis"]

#making series from data
series=pd.DataFrame(data)

series["g"]=series[0].str.isalpha()
series


isalpha returning NaN values when its supposed to return Bool series