# tokenize - pydoc - phpman

Help on module tokenize:

## NAME
    tokenize - Tokenization help for Python programs.

## MODULE REFERENCE
    <https://docs.python.org/3.10/library/tokenize.html>

    The following documentation is automatically generated from the Python
    source files.  It may be incomplete, incorrect or include features that
    are considered implementation detail and may vary between Python
    implementations.  When in doubt, consult the module reference at the
    location listed above.

## DESCRIPTION
### tokenize
    Python tokens.  It decodes the bytes according to PEP-0263 for
    determining source file encoding.

    It accepts a readline-like method which is called repeatedly to get the
    next line of input (or b"" for EOF).  It generates 5-tuples with these
    members:

        the token type (see token.py)
        the token (a string)
        the starting (row, column) indices of the token (a 2-tuple of ints)
        the ending (row, column) indices of the token (a 2-tuple of ints)
        the original line (string)

    It is designed to match the working of the Python tokenizer exactly, except
    that it produces COMMENT tokens for comments and gives type OP for all
    operators.  Additionally, all token lists start with an ENCODING token
    which tells you which encoding was used to decode the bytes stream.

## CLASSES
    TokenInfo(builtins.tuple)
        TokenInfo

### class TokenInfo
     |  TokenInfo(type, string, start, end, line)
     |
     |  Method resolution order:
     |      TokenInfo
     |      TokenInfo
     |      builtins.tuple
     |      builtins.object
     |
     |  Methods defined here:
     |
     |  __repr__(self)
     |      Return a nicely formatted representation string
     |
     |  ----------------------------------------------------------------------
     |  Readonly properties defined here:
     |
     |  exact_type
     |
     |  ----------------------------------------------------------------------
     |  Data descriptors defined here:
     |
     |  __dict__
     |      dictionary for instance variables (if defined)
     |
     |  ----------------------------------------------------------------------
     |  Methods inherited from TokenInfo:
     |
     |  __getnewargs__(self)
     |      Return self as a plain tuple.  Used by copy and pickle.
     |
     |  _asdict(self)
     |      Return a new dict which maps field names to their values.
     |
     |  _replace(self, /, **kwds)
     |      Return a new TokenInfo object replacing specified fields with new values
     |
     |  ----------------------------------------------------------------------
     |  Class methods inherited from TokenInfo:
     |
     |  _make(iterable) from builtins.type
     |      Make a new TokenInfo object from a sequence or iterable
     |
     |  ----------------------------------------------------------------------
     |  Static methods inherited from TokenInfo:
     |
     |  __new__(_cls, type, string, start, end, line)
     |      Create new instance of TokenInfo(type, string, start, end, line)
     |
     |  ----------------------------------------------------------------------
     |  Data descriptors inherited from TokenInfo:
     |
     |  type
     |      Alias for field number 0
     |
     |  string
     |      Alias for field number 1
     |
     |  start
     |      Alias for field number 2
     |
     |  end
     |      Alias for field number 3
     |
     |  line
     |      Alias for field number 4
     |
     |  ----------------------------------------------------------------------
     |  Data and other attributes inherited from TokenInfo:
     |
     |  __match_args__ = ('type', 'string', 'start', 'end', 'line')
     |
     |  _field_defaults = {}
     |
     |  _fields = ('type', 'string', 'start', 'end', 'line')
     |
     |  ----------------------------------------------------------------------
     |  Methods inherited from builtins.tuple:
     |
     |  __add__(self, value, /)
     |      Return self+value.
     |
     |  __contains__(self, key, /)
     |      Return key in self.
     |
     |  __eq__(self, value, /)
     |      Return self==value.
     |
     |  __ge__(self, value, /)
     |      Return self>=value.
     |
     |  __getattribute__(self, name, /)
     |      Return getattr(self, name).
     |
     |  __getitem__(self, key, /)
     |      Return self[key].
     |
     |  __gt__(self, value, /)
     |      Return self>value.
     |
     |  __hash__(self, /)
     |      Return hash(self).
     |
     |  __iter__(self, /)
     |      Implement iter(self).
     |
     |  __le__(self, value, /)
     |      Return self<=value.
     |
     |  __len__(self, /)
     |      Return len(self).
     |
     |  __lt__(self, value, /)
     |      Return self<value.
     |
     |  __mul__(self, value, /)
     |      Return self*value.
     |
     |  __ne__(self, value, /)
     |      Return self!=value.
     |
     |  __rmul__(self, value, /)
     |      Return value*self.
     |
     |  count(self, value, /)
     |      Return number of occurrences of value.
     |
     |  index(self, value, start=0, stop=9223372036854775807, /)
     |      Return first index of value.
     |
     |      Raises ValueError if the value is not present.
     |
     |  ----------------------------------------------------------------------
     |  Class methods inherited from builtins.tuple:
     |
     |  __class_getitem__(...) from builtins.type
     |      See PEP 585

## FUNCTIONS
    ISEOF(x)

    ISNONTERMINAL(x)

    ISTERMINAL(x)

### detect_encoding
        The detect_encoding() function is used to detect the encoding that should
        be used to decode a Python source file.  It requires one argument, readline,
        in the same way as the tokenize() generator.

        It will call readline a maximum of twice, and return the encoding used
        (as a string) and a list of any lines (left as bytes) it has read in.

        It detects the encoding from the presence of a utf-8 bom or an encoding
        cookie as specified in pep-0263.  If both a bom and a cookie are present,
        but disagree, a SyntaxError will be raised.  If the encoding cookie is an
        invalid charset, raise a SyntaxError.  Note that if a utf-8 bom is found,
        'utf-8-sig' is returned.

        If no encoding is specified, then the default of 'utf-8' will be returned.

### generate_tokens
        Tokenize a source reading Python code as unicode strings.

        This has the same API as tokenize(), except that it expects the *readline*
        callable to return str objects instead of bytes.

### tokenize
        The tokenize() generator requires one argument, readline, which
        must be a callable object which provides the same interface as the
        readline() method of built-in file objects.  Each call to the function
        should return one line of input as bytes.  Alternatively, readline
        can be a callable function terminating with StopIteration:
            readline = open(myfile, 'rb').__next__  # Example of alternate readline

        The generator produces 5-tuples with these members: the token type; the
        token string; a 2-tuple (srow, scol) of ints specifying the row and
        column where the token begins in the source; a 2-tuple (erow, ecol) of
        ints specifying the row and column where the token ends in the source;
        and the line on which the token was found.  The line passed is the
        physical line.

        The first token sequence will always be an ENCODING token
        which tells you which encoding was used to decode the bytes stream.

### untokenize
        Transform tokens back into Python source code.
        It returns a bytes object, encoded using the ENCODING
        token, which is the first token sequence output by tokenize.

        Each element returned by the iterable must be a token sequence
        with at least two elements, a token number and token value.  If
        only two tokens are passed, the resulting output is poor.

        Round-trip invariant for full input:
            Untokenized source will match input source exactly

        Round-trip invariant for limited input:
            # Output bytes will tokenize back to the input
            t1 = [tok[:2] for tok in tokenize(f.readline)]
            newcode = untokenize(t1)
            readline = [BytesIO(newcode)](https://www.chedong.com/phpMan.php/man/BytesIO/newcode/markdown).readline
            t2 = [tok[:2] for tok in tokenize(readline)]
            assert t1 == t2

## DATA
    AMPER = 19
    AMPEREQUAL = 41
    ASYNC = 56
    AT = 49
    ATEQUAL = 50
    AWAIT = 55
    CIRCUMFLEX = 32
    CIRCUMFLEXEQUAL = 43
    COLON = 11
    COLONEQUAL = 53
    COMMA = 12
    COMMENT = 61
    DEDENT = 6
    DOT = 23
    DOUBLESLASH = 47
    DOUBLESLASHEQUAL = 48
    DOUBLESTAR = 35
    DOUBLESTAREQUAL = 46
    ELLIPSIS = 52
    ENCODING = 63
    ENDMARKER = 0
    EQEQUAL = 27
    EQUAL = 22
    ERRORTOKEN = 60
    GREATER = 21
    GREATEREQUAL = 30
    INDENT = 5
    LBRACE = 25
    LEFTSHIFT = 33
    LEFTSHIFTEQUAL = 44
    LESS = 20
    LESSEQUAL = 29
    LPAR = 7
    LSQB = 9
    MINEQUAL = 37
    MINUS = 15
    NAME = 1
    NEWLINE = 4
    NL = 62
    NOTEQUAL = 28
    NT_OFFSET = 256
    NUMBER = 2
    N_TOKENS = 64
    OP = 54
    PERCENT = 24
    PERCENTEQUAL = 40
    PLUS = 14
    PLUSEQUAL = 36
    RARROW = 51
    RBRACE = 26
    RIGHTSHIFT = 34
    RIGHTSHIFTEQUAL = 45
    RPAR = 8
    RSQB = 10
    SEMI = 13
    SLASH = 17
    SLASHEQUAL = 39
    SOFT_KEYWORD = 59
    STAR = 16
    STAREQUAL = 38
    STRING = 3
    TILDE = 31
    TYPE_COMMENT = 58
    TYPE_IGNORE = 57
    VBAR = 18
    VBAREQUAL = 42
    __all__ = ['tok_name', 'ISTERMINAL', 'ISNONTERMINAL', 'ISEOF', 'ENDMAR...
    tok_name = {0: 'ENDMARKER', 1: 'NAME', 2: 'NUMBER', 3: 'STRING', 4: 'N...

## AUTHOR
    Ka-Ping Yee <<ping@lfw.org>>

## CREDITS
    GvR, ESR, Tim Peters, Thomas Wouters, Fred Drake, Skip Montanaro, Raymond Hettinger, Trent Nelson, Michael Foord

## FILE
    /usr/lib/python3.10/tokenize.py