Python mmap

Research query: Python mmap · jobs: 2 · on-topic sources: 2 · review: Conflicted

Overview

This example shows a simple way of using mmap: import mmap # write a simple example file with open("hello.txt", "wb") as f: f.write(b"Hello Python!\n") with open("hello.txt", "r+b") as f: # memory-map the file, size 0 means whole file mm = mmap.mmap(f.fileno(), 0) # read content via standard file methods print(mm.readline()) # prints b"Hello Python!\n" # read content via slice notation print(mm[:5]) # prints b"Hello" # update content using slice notation; # note that new content must have same size mm[6:] = b" world!\n" # ... and read again using standard file methods mm.seek(0) print(mm.readline()) # prints b"Hello world!\n" # close the map mm.close() mmap can also be used as a context manager in a with statement: import mmap with mmap.mmap(-1, 13) as mm: mm.write(b"Hello world!") Added in version 3.2: Context manager support. — mmap — Memory-mapped file support — Python 3.13.18 documentation (2001)

In computing, mmap(2) is a POSIX-compliant Unix system call that maps files or devices into memory. — Mmap (wikipedia)

How to apply

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Deep look

Encyclopedia

Mmap (wikipedia)

In computing, mmap(2) is a POSIX-compliant Unix system call that maps files or devices into memory. (new this job) — source

Other

mmap — Memory-mapped file support — Python 3.13.18 documentation (2001)

mmap — Memory-mapped file support — Python 3.13.18 documentation Navigation index modules | next | previous | Python » 3.13.18 Documentation » The Python standard library » Networking and Interprocess Communication » mmap — Memory-mapped file support | Theme Auto Light Dark | mmap — Memory-mapped file support¶ Availability: not WASI. — source

Table of Contents mmap — Memory-mapped file support MADV_* Constants MAP_* Constants Previous topic signal — Set handlers for asynchronous events Next topic Internet Data Handling This page Report a bug Show source « Navigation index modules | next | previous | Python » 3.13.18 Documentation » The Python standard library » Networking and Interprocess Communication » mmap — Memory-mapped file support | Theme Auto Light Dark | © Copyright 2001-2026, Python Software Foundation. — source

This example shows a simple way of using mmap: import mmap # write a simple example file with open("hello.txt", "wb") as f: f.write(b"Hello Python!\n") with open("hello.txt", "r+b") as f: # memory-map the file, size 0 means whole file mm = mmap.mmap(f.fileno(), 0) # read content via standard file methods print(mm.readline()) # prints b"Hello Python!\n" # read content via slice notation print(mm[:5]) # prints b"Hello" # update content using slice notation; # note that new content must have same size mm[6:] = b" world!\n" # ... and read again using standard file methods mm.seek(0) print(mm.readline()) # prints b"Hello world!\n" # close the map mm.close() mmap can also be used as a context manager in a with statement: import mmap with mmap.mmap(-1, 13) as mm: mm.write(b"Hello world!") Added in version 3.2: Context manager support. — source

Review

Status Conflicted. Verified claims 4. On-topic sources 1 (reused 0). Dropped 0 collector hit(s) and 0 off-topic local claim(s). Conflicts 3. Coverage: python, mmap.

Map

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Provenance

Sealed job cd202893471d381e10ff89139efc2983. Shards: agent.scout. Dropped 0 off-topic collector hit(s) and 0 off-topic local claim(s). Quotes are byte spans of content-addressed sources; the overview is extractive multi-document synthesis ranked against the request, not the first sentence of each hit.