f=file("hello.txt","w+")
li=["hello world\n","hello china\n"]
f.writelines(li)
f.close()
hello world hello china
f=file("hello.txt","a+")
new_context="goodbye"
f.write(new_content)
f.close()
hello world hello china goodbye
>>> f=file("hello.txt","w+")
>>> li=["hello world\n","hello china\n"]
>>> f.writelines(li)
>>> f.close()
>>>
>>> f=file("hello.txt","a+")
>>> new_context="goodbye"
>>> f.write(new_content)
>>> f.write(new_content)
>>> f.close()
hello world hello china goodbyegoodbye
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