str 和unicode的互转

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//str 和unicode的互转
#coding=utf-8
def to_unicode(unicode_or_str):
    if isinstance(unicode_or_str,str):
        value=unicode_or_str.decode('utf-8')
    else:
        value=unicode_or_str
    return value
def to_str(unicode_or_str):
    if isinstance(unicode_or_str,unicode):
        value=unicode_or_str.encode('utf-8')
    else:
        value=unicode_or_str
    return value