ConfigParser section creation

Question

如果多次执行ConfigParser config.add_section('main') ，则针对同一文件是否会导致出现错误，例如具有多个main部分，或者如果已经存在则跳过创建部分？

Answer 1

Quoting the documentation of configparser.ConfigParser.add_section :

add_section(section) Add a section named section to the instance. If a section by the given name already exists, DuplicateSectionError is raised.

Answer 2

ConfigParser object can be seen as a dictonary (section) of dictionaries (option/option values).

Using add_section twice on the same name raises an exception

import configparser

s = configparser.ConfigParser()
s.add_section("main")
s.add_section("main")

gives:

configparser.DuplicateSectionError: Section 'main' already exists

workaround check if section exists, add only if it doesn't:

def add_section_no_matter_what(s,section_name):
   if not s.has_section(section_name):
      s.add_section(section_name)

useful in an helper function to create section if not already exists, else use the existing one.