Multiple pandas.dataframe to one csv file

Question

I have multiple pandas dataframes, and hope to write them as one CSV file. What is the most straightforward way?

For example, from following four dataframes,

Answer 1

For anyone that needs to append multiple dataframes to same csv vertically, you can use this:

for df in list_of_dfs:
    with open('all_dfs.csv','a') as f:
        df.to_csv(f)
        f.write("\n")