Python string and file operations Common function Analysis _python

The example in this article analyzes the common functions of Python strings and file operations. Share to everyone for your reference. as follows:

#-*-Coding:utf-8-*-' Created on 2010-12-27 @author: Sumory ' ' Import itertools def a_containsanyof_b (seq,aset): "To determine if SEQ contains one or more items in Aset seq can be a string or list aset should be a string or list ' for item in Itertools.ifilter (ASET.__CONTAINS__,SEQ) 
  : Return True to return False def a_allin_b (seq,aset): ' Determine if all items in seq are in aset seq can be a string or list aset should be a string or list ' For the item in Seq:if item isn't in Aset:return False return True def a_containsall_b (seq,aset): "To determine whether SEQ is wrapped Contains all the items in the Aset seq can be a string or a list aset should be a string or any set object A,a.difference (b) is equivalent to A-set (b), that is, to return all elements in a that do not belong to B. Not set (aset). difference (SEQ) Import string #生成所有字符的可复用的字符串 Sumory_allchars=string.maketrans (",") def Makefilter ( Keep): "Returns a function that takes a source string as a parameter \ and returns a partial copy of the string \ This copy includes only the characters in Keep, keep must be an ordinary string \ Invocation Example: Makefilter (' ABCA ') (' A BCDEFGH Ijkal CBA ') \ retains the character in the following string, abc a CBA ' #按照sumory_allchars规则剔除sumory_allchars字符串中的keep里的字符 #这里得到kee P in Sumory_allchars's complement deleteChars=sumory_allchars.translate (Sumory_allchars,keep) #生成并返回需要的过滤函数 (as closure) def Realdelete (SOURSESTR): Return sourse Str.translate (Sumory_allchars,deletechars) return realdelete def list_removesame (list): ' Delete duplicates in list ' templist=[
  ] for C in List:if C. Templist:templist.append (c) return templist def re_indent (str,numberofspace): ' Indent ' divides string str by line-break and adds Numberofspace space\ to string ' spaces=numberofspace* ' before each sentence Lines=[spaces+line.strip
  () in Str.splitlines ()] return ' \ n '. Join (lines) def replace_strby_dict (soursestr,dict,marker= ' ", Safe=false): "Use the dictionary to replace the corresponding value of the marker package in the source string ' #如果safe为True, then do not replace if Safe:def lookup (w) if the dictionary is not found: return Dict.get (W,W.J Oin (marker*2)) #w. Join (MARKER*2) with the marker package W #如果safe为False, then the dictionary does not find the key throw exception \ #若将dict [W] for Dict.get (W) is not found when return none else : Def lookup (W): Return dict[w] #根据marker切分源字符串 splitparts=soursestr.split (marker) #取出切分后的奇数项 #因为切分后, List
 The marker wrapped item in the source string must be in the base position This is also true for strings such as #就算是 ' ' is one ' #分割后的第0项为空串, and the 1th is the Splitparts[1::2]=map (Lookup,splitparts[1::2]) return '. Join ( SplitParts def simply_replace_strby_dict (soursestr,dict,safe=true): "Replace the substring of $ tag in soursestr original string \ dict= {' By Dict content" Name ': ' sumory ', ' Else ': ' Default '} $$5-> $ $else-> default ${name} ' s method-> sumory ' s method ' sty Le=string.
  Template (SOURSESTR) #如果safe, in the dict can not find the words will not be replaced, still keep the original string if Safe:return Style.safe_substitute (dict) #false, can not find the throw exception Else:return Style.substitute (dict) ################################################## def scanner (object, Linehandler): "Use the Linehandler method to iterate through each item of object ' for line in Object:linehandler (line) def printfilelines (path): ' ' Read the file screen in path to print line by row ' Fileobject=open (path, ' R ') #open不用放到try里 try:for lines in Fileobject:print (Line.rstrip
  (' \ n ')] Finally:fileobject.close () def writelisttofile (path,ilist): Fileobject=open (Path, ' W ') Try:fileobject.writeli
NES (IList) Finally:    Fileobject.close () Import ZipFile def listzipfilesinfo (path): Z=zipfile. ZipFile (path, ' r ') try:for filename in z.namelist (): bytes=z.read (filename) print (' file:%s size:%s '% (uni Code (filename, ' cp936 '). Decode (' Utf-8 '), Len (bytes)) finally:z.close () Import Os,fnmatch def list_all_files (Root, 
  Patterns= ' * ', Single_level=false,yield_folders=false: ' Lists directories (or files under their subdirectories) ' #分割模式到列表 patterns=patterns.split (';') For path,subdirs,files in Os.walk (root): if Yield_folders:files.extend (subdirs) Files.sort () for Nam E in files:for Pat Patterns:if Fnmatch.fnmatch (name, Pat): Yield '/'. Join (Unicode (Os.path.joi 
  N (path,name), ' cp936 '). Split (' \ \) ') break if Single_level:break def swapextensions (root,before,after): If before[:1]!= '. ': before= '. ' +before Extensionlen=-len (before) if after[:1]!= '. ': after= '. ' +after for path,subdirs,files in Os.walk (root): for Oldfile in Files:if Oldfile[extensionlen:]==before:oldfile=os.path.join (Path,oldfile) newfile=oldfile[:extensionlen]+after Os.rename (Oldfile, NewFile)

I hope this article will help you with your Python programming.