我有一個3GB的CSV文件，我嘗試使用python讀取，我需要中位數列。from numpy import * def data():    return genfromtxt('All.csv',delimiter=',')data = data() # This is where it fails already.med = zeros(len(data[0]))data = data.Tfor i in xrange(len(data)):    m = median(data[i])    med[i] = 1.0/float(m)print med我得到的錯誤是這樣的：Python(1545) malloc: *** mmap(size=16777216) failed (error code=12)*** error: can't allocate region*** set a breakpoint in malloc_error_break to debugTraceback (most recent call last):  File "Normalize.py", line 40, in <module>  data = data()  File "Normalize.py", line 39, in data  return genfromtxt('All.csv',delimiter=',')File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/numpy/lib/npyio.py", line 1495, in genfromtxtfor (i, line) in enumerate(itertools.chain([first_line, ], fhd)):MemoryError我認為這只是內存不足錯誤。我正在運行具有4GB ram的64位MacOSX，并且以64位模式編譯了numpy和Python。我該如何解決？我應該嘗試僅用于內存管理的分布式方法嗎？謝謝編輯：也嘗試與此，但沒有運氣...genfromtxt('All.csv',delimiter=',', dtype=float16)