Python: File operations

Abstract: get attributes with a given file, namely file name, file head , file tail, copy file et.

The script:

import os

import shutil #copy file

#class

class os_file:

     def __init__(self, file):

          self.file=file

     def file_name(self):

          items=self.file.split('/')

          file_name=items[-1]

          return file_name

     def name_head(self):

          file_name=self.file_name()

          head, tail=file_name.split('.')

          return(head)

     def name_tail(self):

          file_name=self.file_name()

          head, tail=file_name.split('.')

          return(tail)

     def change_tail(self, tail):

          head=self.name_head()

          new_name=head+'.'+tail

          return new_name

     def file_size(self):

          statinfo = os.stat(self.file)

          file_size=statinfo.st_size

          return(file_size)

     def format_dir(self, dir):

          if not dir[-1] == '/':

               dir=dir+'/'

          if not os.path.isdir(dir):

               os.mkdir(dir, 0755)

          return dir

     def cp_file(self, dir):

          shutil.copy(self.file, dir)

          out_file=self.format_dir(dir)+self.file_name()

          return out_file

     def soft_cp(self, dir):

          out_file=self.format_dir(dir)+self.file_name()

          if os.path.isfile(out_file):

               return 'no'

          else:

               shutil.copy(self.file, dir)

          return out_file

############

#main program

f=os_file('/home/yuan/data_2/test/test_R1.fastq')

#

print 'File name: ', f.file_name()

print 'Head of file name: ', f.name_head()

print 'Tail of file name: ', f.name_tail()

print 'New file name: ', f.change_tail('fq')

print 'file size: ', f.file_size()

print 'copy file even if it exits:', f.cp_file('/home/yuan/data_2/test/sub')

print 'copy file only if it doesnot exit:', f.soft_cp('/home/yuan/data_2/test/sub')

Writing date: 20150514