Format string unused named arguments [duplicate]

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If you are using Python 3.2+, use can use str.format_map().

For bond, bond:

from collections import defaultdict
'{bond}, {james} {bond}'.format_map(defaultdict(str, bond='bond'))

Result:

'bond,  bond'

For bond, {james} bond:

class SafeDict(dict):
    def __missing__(self, key):
        return '{' + key + '}'

'{bond}, {james} {bond}'.format_map(SafeDict(bond='bond'))

Result:

'bond, {james} bond'

In Python 2.6/2.7

For bond, bond:

from collections import defaultdict
import string
string.Formatter().vformat('{bond}, {james} {bond}', (), defaultdict(str, bond='bond'))

Result:

'bond,  bond'

For bond, {james} bond:

from collections import defaultdict
import string

class SafeDict(dict):
    def __missing__(self, key):
        return '{' + key + '}'

string.Formatter().vformat('{bond}, {james} {bond}', (), SafeDict(bond='bond'))

Result:

'bond, {james} bond'

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