Eric Smith wrote:
> One of the things that PEP 3101 deliberately under specifies is the
> Formatter class, leaving decisions up to the implementation. Now that a
> working implementation exists, I think it's reasonable to tighten it up.
<examples deleted>
I should also have included the recipe for the 'smart' formatter
mentioned in the PEP, which automatically searches local and global
namespaces:
---------------------
import inspect
from string import Formatter
class SmartFormatter(Formatter):
def vformat(self, format_string, args, kwargs):
self.locals = inspect.currentframe(2).f_locals
return super(SmartFormatter, self).vformat(format_string, args,
kwargs)
def get_value(self, key, args, kwargs):
if isinstance(key, basestring):
try:
# try kwargs first
return kwargs[key]
except KeyError:
try:
# try locals next
return self.locals[key]
except KeyError:
# try globals last
return globals()[key]
else:
return args[key]
def func():
var0 = 'local--0'
print(fmt.format('in func 0:{var0} 1:{var1}'))
fmt = SmartFormatter()
var0 = 'global-0'
var1 = 'global-1'
func()
print(fmt.format('in module 0:{var0} 1:{var1}'))
---------------------
This code produces:
in func 0:local--0 1:global-1
in module 0:global-0 1:global-1
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