PyCharm中出现unsupported operand type(s) for +=: 'int' and 'str'错误求助

Let's break down what's going on and fix this issue quickly:

Why This Error Happens #

The problem is straightforward: you're trying to add a string value to an integer variable. Look at your cards list—all elements are string types like '2' or '10'. When you pull DC using random.choice(cards), it’s a string, but PC and CC are integers meant to track score totals. Mixing these incompatible types with the += operator triggers the error you’re seeing.

How to Resolve It #

You have two simple, effective ways to fix this:

• Option 1: Convert the string value to an integer immediately after picking it from the list
• Option 2: Define the cards list with integer values instead of strings (this is cleaner and avoids repeated conversions)

Corrected Code Examples #

Option 1: Convert After Picking the Card

import random  # Don't forget this—your original code was missing the random module import!

# Initialize score variables as integers
PC = 0
CC = 0
nick = "Player"  # Make sure to define this variable before using it

while True:
    cards = ['2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14']
    DC = random.choice(cards)
    PC += int(DC)  # Convert string to integer before adding to the score
    card = random.choice(cards)
    CC += int(card)  # Fixed this line—you originally used DC here, which would reuse the same card for both players
    again = input("again : ")
    
    if again == "no":
        print("Ok")
        if PC > 21:
            print("YOU LOSS")
        elif PC > CC:
            print("YOU WON")
        else:
            print("YOU LOSS")
        break
    
    if PC > 21:
        print(nick, "LOSE")
        break

Option 2: Use Integer Values in the cards List

import random

PC = 0
CC = 0
nick = "Player"

while True:
    # Define cards with integers instead of strings to skip conversion
    cards = [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]
    DC = random.choice(cards)
    PC += DC  # Directly add integers—no conversion needed
    card = random.choice(cards)
    CC += card
    
    again = input("again : ")
    
    if again == "no":
        print("Ok")
        if PC > 21:
            print("YOU LOSS")
        elif PC > CC:
            print("YOU WON")
        else:
            print("YOU LOSS")
        break
    
    if PC > 21:
        print(nick, "LOSE")
        break

Quick Extra Tips #

• I added the import random line because your original code was missing it—you’d get a NameError without importing the module first.
• I fixed the CC += DC line to CC += card—otherwise, both players would receive the exact same card every round, which is almost certainly not the behavior you want for a card game.

内容的提问来源于stack exchange，提问作者Mr Pizza