7.7 `mmap` -- Memory-mapped file support

Memory-mapped file objects behave like both mutable strings and like file objects. You can use mmap objects in most places where strings are expected; for example, you can use the re module to search through a memory-mapped file. Since they're mutable, you can change a single character by doing obj[index] = 'a', or change a substring by assigning to a slice: obj[i1:i2] = '...'. You can also read and write data starting at the current file position, and seek() through the file to different positions.

A memory-mapped file is created by the following function, which is different on Unix and on Windows.

mmap(fileno, length[, tagname]): (Windows version) Maps length bytes from the file specified by the file handle fileno, and returns a mmap object. If length is 0, the maximum length of the map will be the current size of the file when mmap() is called. If you wish to map an existing Python file object, use its fileno() method to obtain the correct value for the fileno parameter. The file must be opened for update.
tagname, if specified and not None, is a string giving a tag name for the mapping. Windows allows you to have many different mappings against the same file. If you specify the name of an existing tag, that tag is opened, otherwise a new tag of this name is created. If this parameter is omitted or None, the mapping is created without a name. Avoiding the use of the tag parameter will assist in keeping your code portable between Unix and Windows.

mmap(fileno, size[, flags, prot])

(Unix version) Maps length bytes from the file specified by the file handle fileno, and returns a mmap object. If you wish to map an existing Python file object, use its fileno() method to obtain the correct value for the fileno parameter. The file must be opened for update.

flags specifies the nature of the mapping. MAP_PRIVATECreates a private copy-on-write mapping, so changes to the contents of the mmap object will be private to this process, and MAP_SHAREDCreates a mapping that's shared with all other processes mapping the same areas of the file. The default value is MAP_SHARED.

prot, if specified, gives the desired memory protection; the two most useful values are PROT_READ and PROT_WRITE, to specify that the pages may be read or written. prot defaults to PROT_READ | PROT_WRITE.

Memory-mapped file objects support the following methods:

close(): Close the file. Subsequent calls to other methods of the object will result in an exception being raised.

find(string[, start]): Returns the lowest index in the object where the substring string is found. Returns -1 on failure. start is the index at which the search begins, and defaults to zero.

flush([offset, size]): Flushes changes made to the in-memory copy of a file back to disk. Without use of this call there is no guarantee that changes are written back before the object is destroyed. If offset and size are specified, only changes to the given range of bytes will be flushed to disk; otherwise, the whole extent of the mapping is flushed.

move(dest, src, count): Copy the count bytes starting at offset src to the destination index dest.

read(num): Return a string containing up to num bytes starting from the current file position; the file position is updated to point after the bytes that were returned.

read_byte(): Returns a string of length 1 containing the character at the current file position, and advances the file position by 1.

readline(): Returns a single line, starting at the current file position and up to the next newline.

resize(newsize)

seek(pos[, whence]): Set the file's current position. whence argument is optional and defaults to 0 (absolute file positioning); other values are 1 (seek relative to the current position) and 2 (seek relative to the file's end).

size(): Return the length of the file, which can be larger than the size of the memory-mapped area.

tell(): Returns the current position of the file pointer.

write(string): Write the bytes in string into memory at the current position of the file pointer; the file position is updated to point after the bytes that were written.

write_byte(byte): Write the single-character string byte into memory at the current position of the file pointer; the file position is advanced by 1.

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