python numpy to CSV, numpy to pandas, pandas to CSV

Sample code for
- numpy to CSV
- numpy to pandas
- pandas to CSV

import numpy as np
import pandas as pd

f1_numpy = "./data/test1.csv"
f2_pandas = "./data/test2.csv"

#numpy to csv
np.savetxt(f1_numpy, np.array([10,20]))
print(f1_numpy)

#numpy to pandas and csv
pda = pd.DataFrame(np.array([10,20]), columns=['data'])
pda.to_csv(f2_pandas, index=False)

Thank you.