Cartesian product

deck_of_cards.py

import random

def cartesian_product (seq1, seq2):
    return [a+b for a in seq1 for b in seq2]

# A deck of cards
deck = cartesian_product ('♠♥♦♣', list('123456789') + ['10'] + list('JQK'))

def shuffle_cards ():
    random.shuffle (deck)

def draw_hand (ncards=5):
    hand = random.sample (deck, ncards)
    for card in hand: deck.remove (card)
    return hand

def draw_card ():
    card = random.choice (deck)
    deck.remove (card)
    return card


shuffle_cards()
player1 = draw_hand (5)
player2 = draw_hand (5)

print ('Your hand', ' '.join (player1))

answer = input ('Throw which cards? ')
for i in [int(s) for s in answer.split()]:
    player1[i-1] = draw_card()

print ('Your hand', ' '.join (player1))

Output

Your hand ♣J ♥J ♥Q ♠4 ♥6
Throw which cards? 4 5
Your hand ♣J ♥J ♥Q ♣Q ♣K