CODEWITHSUNDEEP
pythonmemory
user3893623
user3893623

Reputation: 321

python - memory error

When trying to load a large text file into memory I get this:

Python(24297,0xa0d291a8) malloc: *** mach_vm_map(size=717418496) failed (error code=3)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug 
MemoryError

The code that's causing it is:

with open('list.txt') as f:
        total = sum(1 for _ in f)

Is there a native python way to take care of this?

Upvotes: 1

Views: 4141

Answers (1)

Robᵩ
Robᵩ

Reputation: 168626

Wild guess:

You are running the above code on a binary file that contains no (or very few) newlines. Thus, the attempt to read one line reads one very long line.

Try this instead:

with open('list.txt') as f:
    total = sum(block.count('\n')
                for block in iter(lambda: f.read(64*1024), ''))

Upvotes: 2

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