python - How to copy files from one directory to another only if the file is not present in destination?

Question

I would like to check the file by its name and copy from the src_dir to dest_dir in their respective folders if that file is not present in dest_dir.

For example, I have a

src_dir

• firstfolder
  • file1
  • file3
  • file4
• secondfolder
  • file1
  • file2
• anotherfolder
  • file1.txt
  • file2.txt

dest_dir

• firstfolder

  • file1
  • file2

• secondfolder

  • file1

• athirdfolder

• anotherfolder

  • file.txt

The result should be,

dest_dir

• firstfolder

  • file1
  • file2
  • file3
  • file4

• secondfolder

  • file1
  • file2

• athirdfolder

• anotherfolder

  • file.txt
  • file1.txt
  • file2.txt

Answer 1

Partially answered here .

import os
from shutil import copyfile

filename = 'file.ext'
src_dir = 'src/'
dst_dir = 'dst/'

if not os.path.isfile(dst_dir + filename):
   copyfile(src_dir + filename, dst_dir + filename)

If you wish to do so for each file in a directory:

import os
from shutil import copyfile
import glob

src_dir = 'src/'
dst_dir = 'dst/'

for file_path in glob.glob(os.path.join(src_dir, '*')):
    filename = os.path.basename(file_path)
    if os.path.isfile(file_path) and not os.path.isfile(dst_dir + filename):
        copyfile(file_path, dst_dir + filename)