kendoit

方法一：執行時間較短，但耗費記憶體 (readlines)
f = open(filename,'r')
for line in f.readlines():
  if condition:
    do something
f.close()
方法二：省記憶體，執行時間較久 - 適合開大檔

f = open(filename,'r')
for line in f:
  if condition:
    do something
f.close()

下面的圖轉自 - Python: speed vs. memory tradeoff reading files -  isilanes on February 15, 2008

Fig. 1: Memory vs file size for both methods of reading the file

Fig. 2: Execution time vs file size for both methods of reading the file