config.ini

[section]
key1 = aaa
key2 = bbb
key3 = ccc

[db2]
key4 = ddd

 .py

# -*- coding: utf-8 -*-
from configparser import ConfigParser


# 读取config.ini配置文件
def readFile():
    cp = ConfigParser()
    cp.read("config.ini", encoding='UTF-8-sig')
    listSection = cp.options('section')  # 获取指定section下所有的key
    print(listSection)  # 运行结果： ['字段1', '字段2']

    items = cp.items('section')  # 获取指定section下的所有 key value
    print(items)  # 运行结果：[('字段1', 'aaa'), ('字段2', 'bbb')]

    # 获取指定section下 key对应的value
    str1 = cp.get('section', 'key1')
    str2 = cp.get('section', 'key2')
    str3 = cp.get('db', 'key3')
    print(str1, str2, str3)  # 运行结果：aaa bbb ccc

    # 判断是否存在 section或对应的key
    print(cp.has_section('db'))  # 运行结果：True
    print(cp.has_option('db', 'key4'))  # 运行结果：False

    # 删除section
    cp.remove_section('db')
    cp.write(open('config.ini', 'w'))

    # 删除section对应的key
    cp.remove_option('db', 'key3')
    cp.write(open('config.ini', 'w'))


# 写入config.ini配置文件
def writeFile():
    cp = ConfigParser()

    # 添加section
    cp.add_section('db1')  # 创建section db1
    cp.add_section('db2')  # 创建section db2
    cp.set('db1', 'key1', 'value1')  # 添加 key1=value1 到 db1下
    cp.set('db1', 'key2', 'value2')
    cp.set('db1', 'key3', 'value3')
    cp.set('db2', 'key4', 'value4')  # 添加 key4=value4 到 db2下
    cp.write(open('config.ini', 'w'))   # 写入文件并保存

写入后的config.ini

[db1]
key1 = value1
key2 = value2
key3 = value3

[db2]
key4 = value4