#coding=utf-8import osclass Solution: def __init__(self):  self.dirPath = []  def numberOfCode(self,path):  for dir in os.listdir(path):   childDir = os.path.join(path,dir)   if os.path.isdir(childDir):    self.numberOfCode(childDir)   else:    if childDir[-2:] == "py":     self.dirPath.append(childDir)  return self.dirPath  def setCode(self):  with open("/home/code.py","ab+") as f:   for file in self.dirPath:    content = open(file,"r").read()    f.write(content)s = Solution()s.numberOfCode("/home/py/")s.setCode()