How can I set a random selection from all columns from a CSV file?

Question

How can I set a random selection from all columns from a CSV file? My selection mode is only from one column, although I have set to use 4 columns. The original CSV file Comes with all these cards (7,8,9,10, J, Q, K, A). I use np.random.choice because the regular random gives first preference for numbers.

Thank you

CSV file

    card_1  Card_2  Card_3  Card_4
0     J      7         A      8
1     J      7         A      8
2     J      7         A      8
3     J      7         A      8
4     J      7         A      8

import pandas as pd
import numpy as np

df = pd.read_csv('test.csv')

random_colnames = np.random.choice(df.columns,4, replace = False) # columns

for col in random_colnames:
    for _ in range(1):
        draw = np.random.choice(df[col],4) # cards
        print(draw)  

Results

[8 8 8 8]
[7 7 7 7]
['J' 'J' 'J' 'J']
['A' 'A' 'A' 'A']