# Python code demonstrate 
# Make headers snake case
 
import pandas as pd
 
# initialise data of lists.
data = {'First Name':['Tom', 'nick', 'krish', 'jack'], 'Age of Person':[20, 21, 19, 18]}
 
# Create DataFrame
df = pd.DataFrame(data)
 
# Print the output.
print(df)

# Make headers snake case
df.columns = [x.lower() for x in df.columns]
df.columns = df.columns.str.replace("[ ]", "_", regex=True)

# Print the output.
print(df)