python读取大文件并逐行写入另外一个文件

<pre name="code" class="python">creazy.txt文件有4G，逐行读取其内容并写入monday.txt文件里。

def creazyRead():
'''
with open("e:creazy.txt","r") as cr:
for line in cr:
print line
'''
ms = open("e:creazy.txt")
for line in ms:
with open("e:monday.txt","a") as mon:
mon.write(line)

另一种方法使用readlines实现：

def creazyRead():
    ms = open("e:creazy.txt")
    for line in ms.readlines():
        with open("e:monday.txt","a") as mon:
            mon.write(line)