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if not hasattr('', 'format'):
from string import Template
import re
def str_format(string, *args, **kwargs):
tpl = Template(string)
tpl.pattern = str_format.re
return tpl.substitute(*args, **kwargs)
str_format.re = re.compile(r'\{(?P<named>[A-Za-z0-9_]+)\}')
else:
def str_format(string, *args, **kwargs):
return string.format(*args, **kwargs)
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