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zi- 和__exit__在哪里被确定为zi-file?
原标题:where is the __enter__ and __exit__ defined for zipfile?
最佳回答

I ve added this as another answer because it is generally not an answer to initial question. However, it can help to fix your problem.

class MyZipFile(zipfile.ZipFile): # Create class based on zipfile.ZipFile
  def __init__(file, mode= r ): # Initial part of our module
    zipfile.ZipFile.__init__(file, mode) # Create ZipFile object

  def __enter__(self): # On entering...
    return(self) # Return object created in __init__ part
  def __exit__(self, exc_type, exc_val, exc_tb): # On exiting...
    self.close() # Use close method of zipfile.ZipFile

使用:

with MyZipFile( new.zip ,  w ) as tempzip: # Use content manager of MyZipFile
  tempzip.write( sbdtools.py ) # Write file to our archive

如果是,

help(MyZipFile)

you can see all methods of original zipfile.ZipFile and your own methods: init, enter and exit. You can add another own functions if you want. Good luck!

问题回答

zipfile.ZipFile is not a context Manager in 2.6, this has been supplemented in 2.7.

a. 使用物体类别创建班级的实例:

class ZipExtractor(object): # Create class that can only extract zip files
  def __init__(self, path): # Initial part
    import zipfile # Import old zipfile
    self.Path = path # To make path available to all class
    try: open(self.Path,  rb ) # To check whether file exists
    except IOError: print( File doesn t exist ) # Catch error and print it
    else: # If file can be opened
      with open(self.Path,  rb ) as temp:
        self.Header = temp.read(4) # Read first 4 bytes
        if self.Header !=  x50x4Bx03x04 :
          print( Your file is not a zip archive! )
        else: self.ZipObject = zipfile.ZipFile(self.Path,  r )

  def __enter__(self): # On entering...
    return(self) # Return object created in __init__ part
  def __exit__(self, exc_type, exc_val, exc_tb): # On exiting...
    self.close() # Use close method of our class

  def SuperExtract(member=None, path=None):
       Used to extract files from zip archive. If arg  member 
    was not set, extract all files. If path was set, extract file(s)
    to selected folder.   
    print( Extracting ZIP archive %s  % self.Path) # Print path of zip
    print( Archive has header %s  % self.Header) # Print header of zip
    if filename=None:
      self.ZipObject.extractall(path) # Extract all if member was not set
    else:
      self.ZipObject.extract(mamber, path) # Else extract selected file

  def close(self): # To close our file
    self.ZipObject.close()

使用:

with ZipExtractor( /path/to/zip ) as zfile:
  zfile.SuperExtract( file ) # Extract file to current dir
  zfile.SuperExtract(None, path= /your/folder ) # Extract all to selected dir

# another way
zfile = ZipExtractor( /path/to/zip )
zfile.SuperExtract( file )
zfile.close() # Don t forget that line to clear memory

如果你得到帮助,你将看到五种方法:

__init__, __enter__, __exit__, close, SuperExtract

我希望我能帮助你。 我没有试过,因此,你可能必须加以改进。

散射加盈余是正确的。 但是,如果你想要的话,你可以写上你自己的班子,添加“被允许的”特征。 你们都需要做的是,在你们的班子中增加两个职能(根据手稿):

def __enter__(self):
  return(self)
def __exit__(self, exc_type, exc_val, exc_tb):
  self.close()

这一点应当足够了,AFAIR。





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