How to Convert Index to Column in Pandas Dataframe?

Concatenate two columns of Pandas dataframe

Last Updated : 01 Aug, 2020

Let's discuss how to Concatenate two columns of dataframe in pandas python. We can do this by using the following functions :

concat()
append()
join()

Example 1 : Using the concat() method.

Python3 1==

# importing the module
import pandas as pd

# creating 2 DataFrames
location = pd.DataFrame({'area': ['new-york', 'columbo', 'mumbai']})
food = pd.DataFrame({'food': ['pizza', 'crabs', 'vada-paw']})

# concatenating the DataFrames
det = pd.concat([location, food], join = 'outer', axis = 1)

# displaying the DataFrame
print(det)

Output :

Example 2 : Using the append() method.

Python3 1==

# importing the module
import pandas as pd

# creating 2 DataFrames
first = pd.DataFrame([['one', 1], ['three', 3]], columns =['name', 'word'])
second = pd.DataFrame([['two', 2], ['four', 4]], columns =['name', 'word'])

# concatenating the DataFrames
dt = first.append(second, ignore_index = True)

# displaying the DataFrame
print(dt)

Output :

Example 3 : Using the .join() method.

Python3 1==

# importing the module
import pandas as pd

# creating 2 DataFrames
location = pd.DataFrame({'area' : ['new-york', 'columbo', 'mumbai']})
food = pd.DataFrame({'food': ['pizza', 'crabs', 'vada-paw']})

# concatenating the DataFrames
dt = location.join(food)

# displaying the DataFrame
print(dt)

Output :

For the three methods to concatenate two columns in a DataFrame, we can add different parameters to change the axis, sort, levels etc.

How to Convert Index to Column in Pandas Dataframe?

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