你不能将链接
string到
int。你需要使用函数将转换int为，或使用格式化输出。
stringstrformatting
变更：
print("Ok. Your balance is now at " + balanceAfterStrength + " skill points.")至：
print("Ok. Your balance is now at {} skill points.".format(balanceAfterStrength))要么：
print("Ok. Your balance is now at " + str(balanceAfterStrength) + " skill points.")或根据注释，用于,将不同的字符串传递给print函数，而不是使用+：- 串联
print("Ok. Your balance is now at ", balanceAfterStrength, " skill points.")
