1.

<span style="font-family:Arial;background-color: rgb(255, 255, 255);">
</span>

f = open("bigFile.txt", "r")
while True:
    line = f.readline()
    if line:
        pass    # do something here
    else:
        break
f.close()

2

f = open("bigFile.txt", "r")
for line in f:
    pass    # do something here
f.close()
 

3

f=open('bigFile.txt','r')
while 1:
    l=f.readline()
    if l=='':
        break
    ####
    #l=l.split()
f.close()

大檔案時推薦第三種，不會卡死

遇到檔案中間含有終止符的情況，使用雙重驗證；若還是不行，以二進位制‘rb’開啟

while 1: 
     line=f.readline() 
     if line=='': 
         tmp=f.readline() 
         if tmp=='': 
             f.close();break 
         else: 
             pass 
     count+=1 
     print count 
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