
Python range
Buffering is an optional integer used to set the buffering policy. Pass 0 to switch buffering off (only allowed in binary mode), 1 to select line buffering (only usable in text mode), and an integer > 1 to indicate the size in bytes of a fixed-size chunk buffer. When no buffering argument is given, the default buffering policy works as follows:
- Binary files are buffered in fixed-size chunks; the size of the buffer is chosen using a heuristic trying to determine the underlying device’s “block size” and falling back on io.DEFAULT_BUFFER_SIZE. On many systems, the buffer will typically be 4096 or 8192 bytes long.
- “Interactive” text files (files for which isatty returns True) use line buffering. Other text files use the policy described above for binary files.
encoding is the name of the encoding used to decode or encode the file. This should only be used in text mode. The default encoding is platform dependent (whatever locale.getpreferredencoding returns), but any text encoding supported by Python can be used. See the codecs module for the list of supported encodings.
errors is an optional string that specifies how encoding and decoding errors are to be handled–this cannot be used in binary mode. A variety of standard error handlers are available (listed under Error Handlers), though any error handling name that has been registered with codecs.register_error is also valid. The standard names include:
- 'strict' to raise a ValueError exception if there is an encoding error. The default value of None has the same effect.
- 'ignore' ignores errors. Note that ignoring encoding errors can lead to data loss.
- 'replace' causes a replacement marker (such as '?') to be inserted where there is malformed data.
- 'surrogateescape' will represent any incorrect bytes as code points in the Unicode Private Use Area ranging from U+DC80 to U+DCFF. These private code points will then be turned back into the same bytes when the surrogateescape error handler is used when writing data. This is useful for processing files in an unknown encoding.
- 'xmlcharrefreplace' is only supported when writing to a file. Characters not supported by the encoding are replaced with the appropriate XML character reference &#nnn;.
- 'backslashreplace' (also only supported when writing) replaces unsupported characters with Python’s backslashed escape sequences.
newline controls how universal newlines mode works (it only applies to text mode). It can be None, '', '\n', '\r', and '\r\n'. It works as follows:
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