mirror of https://github.com/python/cpython.git
#17402: merge with 3.2.
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commit
a142a343e8
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@ -106,19 +106,19 @@ To map anonymous memory, -1 should be passed as the fileno along with the length
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with open("hello.txt", "r+b") as f:
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# memory-map the file, size 0 means whole file
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map = mmap.mmap(f.fileno(), 0)
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mm = mmap.mmap(f.fileno(), 0)
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# read content via standard file methods
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print(map.readline()) # prints b"Hello Python!\n"
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print(mm.readline()) # prints b"Hello Python!\n"
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# read content via slice notation
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print(map[:5]) # prints b"Hello"
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print(mm[:5]) # prints b"Hello"
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# update content using slice notation;
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# note that new content must have same size
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map[6:] = b" world!\n"
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mm[6:] = b" world!\n"
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# ... and read again using standard file methods
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map.seek(0)
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print(map.readline()) # prints b"Hello world!\n"
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mm.seek(0)
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print(mm.readline()) # prints b"Hello world!\n"
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# close the map
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map.close()
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mm.close()
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:class:`mmap` can also be used as a context manager in a :keyword:`with`
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@ -126,8 +126,8 @@ To map anonymous memory, -1 should be passed as the fileno along with the length
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import mmap
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with mmap.mmap(-1, 13) as map:
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map.write("Hello world!")
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with mmap.mmap(-1, 13) as mm:
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mm.write("Hello world!")
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.. versionadded:: 3.2
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Context manager support.
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@ -139,16 +139,16 @@ To map anonymous memory, -1 should be passed as the fileno along with the length
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import mmap
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import os
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map = mmap.mmap(-1, 13)
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map.write(b"Hello world!")
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mm = mmap.mmap(-1, 13)
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mm.write(b"Hello world!")
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pid = os.fork()
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if pid == 0: # In a child process
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map.seek(0)
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print(map.readline())
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mm.seek(0)
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print(mm.readline())
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map.close()
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mm.close()
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Memory-mapped file objects support the following methods:
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