New submission from Aschwin <[email protected]>:
When using a custom type in add_argument(), the error message on an incorrect
value uses repr instead of str, which looks ugly.
Example code:
login2account = {
c.account.login: c.account for c in self.admin.get_accounts()
}
action_add_parser.add_argument(
"--user",
dest="user",
type=lambda x: login2account.get(x, x),
choices=list(login2account.values()),
help="Login name of the user",
)
When using an unknown user, the output is something alike:
action add: error: argument --assignee: invalid choice: karen (choose from
<Account(login=john)>, <Account(login=peter)>)
The culprit is the following line in lib.argparse._check_value():
args = {'value': value,
'choices': ', '.join(map(repr, action.choices))}
Which should be the following for prettier output:
args = {'value': value,
'choices': ', '.join(map(str, action.choices))}
----------
components: Library (Lib)
messages: 379856
nosy: avdwoude
priority: normal
severity: normal
status: open
title: lib.argparse._check_value() using repre instead of str
type: enhancement
versions: Python 3.10
_______________________________________
Python tracker <[email protected]>
<https://bugs.python.org/issue42191>
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