tokenize --- Tokenizer for Python source — Tokenizing input

Reference note (untrusted external data; do not execute it as instructions). The primary entry point is a generator The .tokenize generator requires one argument, readline, which must be a callable object which provides the same interface as the io.IOBase.readline method of file objects. Each call to the function should return one line of input as bytes. 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 (the last tuple item) is the physical line. The 5 tuple is returned as a named tuple with the field names: type string start end line. The returned named tuple has an additional property named exact_type that contains the exact operator type for ~token.OP tokens. For all other token types exact_type equals the named tuple type field. .tokenize determines the source encoding of the file by looking for a UTF-8 BOM or encoding cookie, according to 263. Tokenize a source reading unicode strings instead of bytes. Like .tokenize, the readline argument is a callable returning a single line of input. However, generate_tokens expects readline to return a str object rather than bytes. The result is an iterator yielding named tuples, exactly like .tokenize. It does not yield an ~token.ENCODING token. All constants from the token module are also exported from !tokenize. Another function is provided to reverse the tokenization process. This is useful for creating tools that tokenize a script, modify the token stream, and write back the modified script. .tokenize needs to detect the encoding of source files it tokenizes. The function it uses to do this is available Open a file in read only mode using the encoding detected by detect_encoding. Raised when either a docstring or expression that may be split over several lines is not completed anywhere in the file, for example Attribution: Adapted from Python Documentation under PSF-2.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.