详解Python中Pyyaml模块的使用

安装 pip install pyyaml  # 如果是py2，使用 pip install yaml

import yaml

yaml_str = """
name: 一条大河
age: 1956
job: Singer
"""

y = yaml.load(yaml_str, Loader=yaml.SafeLoader)
print(y)

---
name: qiyu
age: 20岁
---
name: qingqing
age: 19岁

import yaml

with open("./yaml_test", 'r', encoding='utf-8') as ymlfile:
  cfg = yaml.load_all(ymlfile, Loader=yaml.SafeLoader)
  for data in cfg:
    print(data)

import yaml

json_data = {'name': '一条大河',
       'age': 1956,
       'job': ['Singer','Dancer']}

y = yaml.dump(json_data, default_flow_style=False).encode('utf-8').decode('unicode_escape')
print(y)

import yaml

json_data = {'name': '一条大河',
       'age': 1956,
       'job': ['Singer', 'Dancer']}
with open('./yaml_write.yaml', 'w') as f:
  y = yaml.dump(json_data, f)
  print(y)

import yaml

obj1 = {"name": "river", "age": 2019}
obj2 = ["Lily", 1956]
obj3 = {"gang": "ben", "age": 1963}
obj4 = ["Zhuqiyu", 1994]

with open('./yaml_write_all.yaml', 'w', encoding='utf-8') as f:
  y = yaml.dump([obj1, obj2, obj3, obj4], f)
  print(y)

with open('./yaml_write_all.yaml', 'r') as r:
  y1 = yaml.load(r, Loader=yaml.SafeLoader)
  print(y1)

str: "Big River"              #字符串
int: 1548                 #整数
float: 3.14                #浮点数
boolean: true               #布尔值
None: null                # 也可以用 ~ 号来表示 null
time: '2019-11-20T08:47:46.576701+00:00'    # 时间，ISO8601 
date: 2019-11-20 16:47:46.576702        # 日期

import yaml
import datetime
import pytz

yaml_data = {
  "str": "Big River",
  "int": 1548,
  "float": 3.14,
  'boolean': True,
  "None": None,
  'time': datetime.datetime.now(tz=pytz.timezone('UTC')).isoformat(),
  'date': datetime.datetime.today()
}

with open('./yaml_test', 'w') as f:
  y = yaml.dump(yaml_data, f)
  print(y)

with open('./yaml_test', 'r') as r:
  y1 = yaml.load(r, Loader=yaml.SafeLoader)
  print(y1)

name: &name SKP
tester: *name

str: !!str 3.14
int: !!int "123"

import yaml
import os

def generate_yaml_doc(yaml_file):
  py_object = {'school': 'zhu',
         'students': ['a', 'b']}
  file = open(yaml_file, 'w', encoding='utf-8')
  yaml.dump(py_object, file)
  file.close()

current_path = os.path.abspath(".")
yaml_path = os.path.join(current_path, "generate.yaml")
generate_yaml_doc(yaml_path)
"""结果
school: zhu
students:
- a
- b
"""

import os
from ruamel import yaml   # pip3 install ruamel.yaml

def generate_yaml_doc_ruamel(yaml_file):
  py_object = {'school': 'zhu',
         'students': ['a', 'b']}
  file = open(yaml_file, 'w', encoding='utf-8')
  yaml.dump(py_object, file, Dumper=yaml.RoundTripDumper)
  file.close()

current_path = os.path.abspath(".")
yaml_path = os.path.join(current_path, "generate.yaml")
generate_yaml_doc_ruamel(yaml_path)
"""结果
school: zhu
students:
- a
- b
"""

import os
from ruamel import yaml

def get_yaml_data_ruamel(yaml_file):
  file = open(yaml_file, 'r', encoding='utf-8')
  data = yaml.load(file, Loader=yaml.Loader)
  file.close()
  print(data)

current_path = os.path.abspath(".")
yaml_path = os.path.join(current_path, "generate.yaml")
get_yaml_data_ruamel(yaml_path)