Ian Pilcher wrote:
> I am trying to use ConfigParser for the first time (while also writing
> my first quasi-serious Python program). Assume that I want to parse a
> a configuration file of the following form:
>
> [section-1]
> option-1 = value1
> option-2 = value2
>
> [section-2]
> option-1 = value3
> option-2 = value4
>
> How do a set a default for option-1 *only* in section-1?
You can provide a default value in your code with
parser = configparser.ConfigParser()
parser.read(configfile)
value = parser.get("section-1", "option-1", fallback="default value")
Or you can invent your own convention that the default values for
"section-1" are found in "section-1-defaults", and then look it up with a
small helper function:
$ cat cpdemo.ini
[section-1-defaults]
option-2=default2
[section-1]
option-1 = value1
[section-2]
option-1 = value2
$ cat cpdemo.py
import configparser
parser = configparser.ConfigParser()
parser.read("cpdemo.ini")
def get(section, option, **kw):
try:
return parser.get(section, option)
except configparser.NoOptionError:
try:
return parser.get(section + "-defaults", option, **kw)
except (configparser.NoSectionError, configparser.NoOptionError):
pass
raise
for section in ["section-1", "section-2"]:
for option in ["option-1", "option-2"]:
value = get(section, option, fallback="#missing")
print("{}/{} = {}".format(section, option, value))
$ python3 cpdemo.py
section-1/option-1 = value1
section-1/option-2 = default2
section-2/option-1 = value2
section-2/option-2 = #missing
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