请问：why 出错

victorxian

#copy file
def copyFile(oldFile, newFile):
    f = open(oldFile, "r")
    f2 = open(newFile, "w")
while 1:
    text = f.readline()
    if text == "":
        break
f2.write(text)
f.close()
f2.close()



copyFile("test.dat","cop.dat");
>>>
Traceback (most recent call last):
  File "E:/ProjectGroup/book/python/Example/CopyFile.py", line 6, in -toplevel-
    text = f.readline()
NameError: name 'f' is not defined

limodou

你的缩近没搞对。while以下的代码都没有缩近，而与def平级，这样它们不再是函数内部的代码，所以出错了。

victorxian

谢谢提醒：
修改后，

#copy file
def copyFile(oldFile, newFile):
    f = open(oldFile, "r")
    f2 = open(newFile, "w")
    while 1:
        text=f.readline()
    if text == "":
        break
    f2.write(text)
    f.close()
    f2.close()



copyFile("test.dat","cop.dat")


提示：
There's and error in your program;
*** 'break' outside loop

limodou

1. 
   
2.     while 1:
   
3.         text=f.readline()
   
4.     if text == "":
   
5.         break
   

复制代码

缩近不对，if应与上一句相同的缩近，而你的与while的缩近一致了。改为：

1. 
   
2.     while 1:
   
3.         text=f.readline()
   
4.         if text == "":
   
5.             break
   

复制代码

victorxian

3ks very much