locale.py 文件源码

def format_string(f, val, grouping=False):
    """Formats a string in the same way that the % formatting would use,
    but takes the current locale into account.
    Grouping is applied if the third parameter is true."""
    percents = list(_percent_re.finditer(f))
    new_f = _percent_re.sub('%s', f)

    if operator.isMappingType(val):
        new_val = []
        for perc in percents:
            if perc.group()[-1]=='%':
                new_val.append('%')
            else:
                new_val.append(format(perc.group(), val, grouping))
    else:
        if not isinstance(val, tuple):
            val = (val,)
        new_val = []
        i = 0
        for perc in percents:
            if perc.group()[-1]=='%':
                new_val.append('%')
            else:
                starcount = perc.group('modifiers').count('*')
                new_val.append(_format(perc.group(),
                                      val[i],
                                      grouping,
                                      False,
                                      *val[i+1:i+1+starcount]))
                i += (1 + starcount)
    val = tuple(new_val)

    return new_f % val