我无法理解这个Python程序中的错误

我找不到其中的错误。它给出的错误是您尚未创建函数life_left或无法找到它

你想让他们打多少次？五,

错误：

回溯（最近一次呼叫最后一次）：
文件“main.py”，第42行，在
开始（7）
文件“main.py”，第39行，开头
arr[编号]。攻击（枪支[枪支编号]）
攻击中第19行的文件“main.py”
离开的生活（自我生活）
NameError:未定义名称“life_left”

代码：

随机导入
阶级敌人：
定义初始化（自）：
自我生活=20
def攻击（自我攻击、枪攻击）：
if（self.life您必须在方法定义和调用类内的方法时使用
self
。以下是固定代码：

import random
class Enemy:
    def __init__(self):
        self.life = 20

    def attack(self,gun):
        if (self.life <= 0):
            print("Dead")
        else:
            if gun is "AK47":
                self.life = self.life - 5
                self.life_left(self.life)
            elif gun is "Magnum":
                self.life = self.life - 4
                self.life_left(self.life)
            else:
                self.life = self.life - 1
                self.life_left(self.life)

    def life_left(self,life):
         print ("Life  :  " , str(life))


def start(players):
    a = 1
    arr = []
    while a <= players:
        arr.append("player" + str(a))
        arr[a-1] = Enemy()
        #print (arr[a-1])
        a += 1
    enemy = int(input("How many times do you want them to fight ? "))
    fight = 1
    guns = ["AK47" , "Magnum" , "other"]
    while fight <= enemy:
        number = random.randint(0,players-1)
        guns_number = random.randint(0,len(guns)-1)
        arr[number].attack(guns[guns_number])
        fight += 1
start(7)

随机导入
阶级敌人：
定义初始化（自）：
自我生活=20
def攻击（自我攻击、枪攻击）：
如果（self.life）你指的是@match所说的
self.life\u left
，在
life\u left
定义-
def life\u left（self，life）
…你还应该在
life\u left
中使用
self.life
（并且没有参数）当我们每次调用同一类的方法时，我们是否必须做这样的事情，或者我们是否可以为这个解决方案提供一个替代方法。
self
类似于其他oop语言中的
this
。请看
import random
class Enemy:
    def __init__(self):
        self.life = 20

    def attack(self,gun):
        if (self.life <= 0):
            print("Dead")
        else:
            if gun is "AK47":
                self.life = self.life - 5
                life_left(self.life)
            elif gun is "Magnum":
                self.life = self.life - 4
                life_left(self.life)
            else:
                self.life = self.life - 1
                life_left(self.life)

    def life_left(life):
         print ("Life  :  " , str(life))


def start(players):
    a = 1
    arr = []
    while a <= players:
    arr.append("player" + str(a))
    arr[a-1] = Enemy()
    #print (arr[a-1])
    a += 1
    enemy = int(input("How many times do you want them to fight ? "))
    fight = 1
    guns = ["AK47" , "Magnum" , "other"]
    while fight <= enemy:
        number = random.randint(0,players-1)
        guns_number = random.randint(0,len(guns)-1)
        arr[number].attack(guns[guns_number])
        fight += 1
start(7)

import random
class Enemy:
    def __init__(self):
        self.life = 20

    def attack(self,gun):
        if (self.life <= 0):
            print("Dead")
        else:
            if gun is "AK47":
                self.life = self.life - 5
                self.life_left(self.life)
            elif gun is "Magnum":
                self.life = self.life - 4
                self.life_left(self.life)
            else:
                self.life = self.life - 1
                self.life_left(self.life)

    def life_left(self,life):
         print ("Life  :  " , str(life))


def start(players):
    a = 1
    arr = []
    while a <= players:
        arr.append("player" + str(a))
        arr[a-1] = Enemy()
        #print (arr[a-1])
        a += 1
    enemy = int(input("How many times do you want them to fight ? "))
    fight = 1
    guns = ["AK47" , "Magnum" , "other"]
    while fight <= enemy:
        number = random.randint(0,players-1)
        guns_number = random.randint(0,len(guns)-1)
        arr[number].attack(guns[guns_number])
        fight += 1
start(7)