python 遍历对象

my_list = [1, 2, 3, 4]
for item in my_list:
    print(item)

my_dict = {'a': 1, 'b': 2, 'c': 3}
for key in my_dict:
    print(key, my_dict[key])

for value in my_dict.values():
    print(value)

for key, value in my_dict.items():
    print(key, value)

my_set = {1, 2, 3, 4}
for item in my_set:
    print(item)

with open('example.txt', 'r') as file:
    for line in file:
        print(line.strip())

def read_large_file(file_path):
    with open(file_path, 'r') as file:
        for line in file:
            yield line.strip()

for line in read_large_file('large_file.txt'):
    process(line)  # 假设process是一个处理每一行的函数

class MyIterable:
    def __init__(self, data):
        self.data = data
        self.index = 0

    def __iter__(self):
        return self

    def __next__(self):
        if self.index >= len(self.data):
            raise StopIteration
        value = self.data[self.index]
        self.index += 1
        return value

my_iterable = MyIterable([1, 2, 3, 4])
for item in my_iterable:
    print(item)