How to get a list from Pandas DataFrame column headers?

Let us understand with an example.

# First, we will see how DataFrame.columns() 
# returns the column names as index

# Importing pandas package
import pandas as pd

# Creating a dictionary of student marks

d = {
    "Peter":[65,70,70,75],
    "Harry":[45,56,66,66],
    "Tom":[67,87,65,53],
    "John":[56,78,65,64]
}

# Now we will create DataFrame and 
# we will assign index name as subject names
df = pd.DataFrame(d,index=["Maths","Physics","Chemistry","English"])

# Column names as index first
print(df.columns,"\n")

# Now, we will see how tolist() method will 
# convert this array into list

# using tolist() method
print("List of column headers")
print(df.columns.values.tolist())

Output:

Index(['Peter', 'Harry', 'Tom', 'John'], dtype='object') 

List of column headers
['Peter', 'Harry', 'Tom', 'John']