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How to use _scan_once method in autotest

Best Python code snippet using autotest_python

scanner.py

Source:scanner.py

...20    parse_constant = context.parse_constant21    object_hook = context.object_hook22    object_pairs_hook = context.object_pairs_hook23    memo = context.memo24    def _scan_once(string, idx):25        try:26            nextchar = string[idx]27        except IndexError:28            raise StopIteration(idx)29        if nextchar == '"':30            return parse_string(string, idx + 1, strict)31        elif nextchar == '{':32            return parse_object((string, idx + 1), strict,33                _scan_once, object_hook, object_pairs_hook, memo)34        elif nextchar == '[':35            return parse_array((string, idx + 1), _scan_once)36        elif nextchar == 'n' and string[idx:idx + 4] == 'null':37            return None, idx + 438        elif nextchar == 't' and string[idx:idx + 4] == 'true':39            return True, idx + 440        elif nextchar == 'f' and string[idx:idx + 5] == 'false':41            return False, idx + 542        m = match_number(string, idx)43        if m is not None:44            integer, frac, exp = m.groups()45            if frac or exp:46                res = parse_float(integer + (frac or '') + (exp or ''))47            else:48                res = parse_int(integer)49            return res, m.end()50        elif nextchar == 'N' and string[idx:idx + 3] == 'NaN':51            return parse_constant('NaN'), idx + 352        elif nextchar == 'I' and string[idx:idx + 8] == 'Infinity':53            return parse_constant('Infinity'), idx + 854        elif nextchar == '-' and string[idx:idx + 9] == '-Infinity':55            return parse_constant('-Infinity'), idx + 956        else:57            raise StopIteration(idx)58    def scan_once(string, idx):59        try:60            return _scan_once(string, idx)61        finally:62            memo.clear()63    return _scan_once...

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