import yaml
with open('demo1.yaml', 'r', encoding='utf-8') as f:
  file_content = f.read()
content = yaml.load(file_content, yaml.FullLoader)
print(content)

- 123             # int
- 3.14            # float
- true            # bool，不区分大小写
- False            # bool
- string           # 字符串
- ''             # 空字符串
- ~              # ~代表 null，Python中的 None
-               # 同上
- 2019-12-12         # date
- 2019-12-12T14:59:59+08:00  # datetime
- name: Miles         # dict
 age: 22

[
 123,
 3.14,
 True,
 False,
 'string',
 '',
 None,
 None,
 datetime.date(2019, 12, 12),
 datetime.datetime(2019, 12, 12, 6, 59, 59),
 {'name': 'Miles', 'age': 22}
]

name: Miles
age: 18
single: true
dream: ~
lucky number:
 - 8
 - 9
 - 12

{
 'name': 'Miles',
 'age': 18,
 'single': True,
 'dream': None,
 'lucky number':[8, 9, 12]
}