loading file in memory using Python

Question

I try to load a file in memory with this:

import mmap

with open(path+fileinput+'example.txt', 'rb') as f:
       fileinput = mmap.mmap(f.fileno(), 0, prot=mmap.PROT_READ)

When I run the code the error:

AttributeError: 'module' object has no attribute 'PROT_READ'

How are you testing how many lines it gives?

Sam Mussmann
– Sam Mussmann

2012-11-21 21:27:56 +00:00
Commented Nov 21, 2012 at 21:27 — Sam Mussmann
– Sam Mussmann, Commented Nov 21, 2012 at 21:27

cnicutar · Accepted Answer · 2012-11-21 19:19:16Z

13

The PROT_READ and PROT_WRITE are Unix-specific. You're likely looking for:

mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)

The mmap page actually has different entries for Unix/Windows version.

answered Nov 21, 2012 at 19:19

cnicutar

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shao.lo · Accepted Answer · 2014-09-25 23:04:29Z

2

I recently got the same error message with my test program mmap.py. Renaming my test program to something else (mmap_test.py) fixed the name collision that caused numpy's memmap.py to get when it executed 'import mmap'.

answered Sep 25, 2014 at 23:04

shao.lo

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