yaml文件管理，包括读取yaml文件内容，写入yaml文件，清空yaml文件。

import pytest
import yaml


# 读取yaml文件
def read_yaml(file):
    with open(file, 'r', encoding='utf-8') as f:
        content = f.read()
    data = yaml.load(content, yaml.FullLoader)
    return data

# 追加写入yaml文件
def write_yaml(file, data):
    with open(file, 'a', encoding='utf-8') as f:
        yaml.dump(data, f)


# 清除yaml文件内容
def clean_yaml(file):
    with open(file, 'r+', encoding='utf-8') as f:
        f.seek(0)  # 把文件定位到第一个位置
        f.truncate()  # 清空文件
    print('执行测试前，先清空yaml文件内容~')


if __name__ == '__main__':
    # read_yaml('key.yml')
    key = {
        "exponent": "123456",
        "modulus": "12345678901234567890-"
    }
    write_yaml('key.yml', key)
    # clean_yaml('key.yml')