<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_in_property(value, is_bytes=False):
 """Get shortcut for `Block` property."""


    if value.startswith('^'):
        prefix = value[1:3]
        temp = value[3:]
        negate = '^'
    else:
        prefix = value[:2]
        temp = value[2:]
        negate = ''

    if prefix != 'in':
        raise ValueError("Does not start with 'in'!")

    value = negate + unidata.unicode_alias['block'].get(temp, temp)
    obj = unidata.ascii_blocks if is_bytes else unidata.unicode_blocks

    return obj[value]