python如何定义一个迭代器去生成偶数数列

#创建迭代器类
class EvenIterator:
    def __init__(self,min_value,max_value):
        # 初始化参数
        self.min_value = min_value 
        self.max_value = max_value
         
    def __iter__(self):
        return self
    def __next__(self):
        # 在这里定义好累加条件
        if self.min_value % 2 != 0:#判断最小值是不是偶数，不是则加1
            self.min_value += 1
        if self.min_value <= self.max_value:
            x = self.min_value
            self.min_value += 2
            return x
        else:#抛出 StopIteration异常，结束代码
            raise StopIteration

min_value = int(input("输入需要生成偶数序列范围的最小值"))
max_value = int(input("输入需要生成偶数序列范围的最大值"))
num2 = EvenIterator(min_value,max_value) #创建迭代器对象
print([i for i in num2],end="")#输出偶数数组

class MyIterator(object):
    def __init__(self, step):
        self.step = step
 
    def __next__(self):
        if self.step == 0:
            raise StopIteration
        self.step -= 1
        return self.step
 
    def __iter__(self):
        return self
 
for i in MyIterator(6):
    print(i)

class Squares:
    def __init__(self, start, stop):
        self.value = start - 1
        self.stop = stop
    def __iter__(self):
        return self
    def __next__(self):
        if self.value == self.stop:
            raise StopIteration
        self.value += 1
        return self.value **2
#Python小白学习交流群：711312441 
for i in Squares(1, 5):
    print(i)

def gsquares(start, stop):
    for i in range(start, stop+1):
        yield i ** 2
 
for i in gsquares(1, 5):
    print(i, end=" ")