import numpy as np

values = ['2','3','4','5','6','7','8','9','10','J','K','Q','A']
suits = ['H','D','S','C']

cards = [[v,s] for v in values for s in suits]

def pair():
    np.random.shuffle(cards)
    pair_counter = 0
    cards_counter = 0
    values = []
    for card in cards:
        value = card[0]
        cards_counter +=1
        if not value in values:
            values.append(value)
        if len(values) ==4:
            pair_counter +=1
        if pair_counter == 1:
            return cards_counter

pair()