Python中循环遍历

Python中循环遍历有多种方式，比较常用的方式有for循环和while循环。下面是两种方式的示例：

1. for循环：

# 遍历列表
my_list = [1, 2, 3, 4, 5]
for i in my_list:
    print(i)

# 遍历字典
my_dict = {'name': 'Tom', 'age': 18, 'gender': 'male'}
for key, value in my_dict.items():
    print(key, value)

# 遍历字符串
my_str = 'hello world'
for char in my_str:
    print(char)

2. while循环：

# 遍历列表
my_list = [1, 2, 3, 4, 5]
i = 0
while i < len(my_list):
    print(my_list[i])
    i += 1

# 遍历字典
my_dict = {'name': 'Tom', 'age': 18, 'gender': 'male'}
keys = list(my_dict.keys())
i = 0
while i < len(keys):
    key = keys[i]
    value = my_dict[key]
    print(key, value)
    i += 1

# 遍历字符串
my_str = 'hello world'
i = 0
while i < len(my_str):
    print(my_str[i])
    i += 1