[Python] Update INI file without removing comments

Consider the following INI file:

[TestSettings]
# First comment goes here
environment = test

[Browser]
# Second comment goes here
browser = chrome
chromedriver = default

...


I'm using Python 2.7 to update the ini file:

config = ConfigParser.ConfigParser()
config.read(path_to_ini)
config.set('TestSettings','environment',r'some_other_value')

with open(path_to_ini, 'wb') as configfile:
config.write(configfile)


How can I update the INI file without removing the comments. The INI file is updated but the comments are removed.

[TestSettings]
environment = some_other_value

[Browser]
browser = chrome
chromedriver = default

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