Python 3.2+configparserexception

configparser.DuplicateOptionError

exceptions

Raised by a strict parser when an option appears twice in a section while reading a single file, string or dictionary.

Syntax

except configparser.DuplicateOptionError as e: e.section, e.option, e.lineno

The trap is case: Host and host become one key after lowercasing, so that is a duplicate too. With strict=False there is no error and the last value silently wins. Setting parser.optionxform = str makes keys case-sensitive again.

Examples

import configparser
text = "[srv]\nHost = a\nhost = b\n"
try:
    configparser.ConfigParser().read_string(text)
except configparser.DuplicateOptionError as e:
    print(e.option, e.lineno)  # → host 3
cs = configparser.ConfigParser()
cs.optionxform = str
cs.read_string(text)
print(dict(cs["srv"]))  # → {'Host': 'a', 'host': 'b'}

See also

Common errors

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