Write file to a directory that doesn't exist

Question

How do I using with open() as f: ... to write the file in a directory that doesn't exist.

For example:

with open('/Users/bill/output/output-text.txt', 'w') as file_to_write:     file_to_write.write("{}\n".format(result)) 

Let's say the /Users/bill/output/ directory doesn't exist. If the directory doesn't exist just create the directory and write the file there.

Answer 1

You need to first create the directory.

The mkdir -p implementation from this answer will do just what you want. mkdir -p will create any parent directories as required, and silently do nothing if it already exists.

Here I've implemented a safe_open_w() method which calls mkdir_p on the directory part of the path, before opening the file for writing:

import os, os.path import errno  # Taken from https://stackoverflow.com/a/600612/119527 def mkdir_p(path):     try:         os.makedirs(path)     except OSError as exc: # Python >2.5         if exc.errno == errno.EEXIST and os.path.isdir(path):             pass         else: raise  def safe_open_w(path):     ''' Open "path" for writing, creating any parent directories as needed.     '''     mkdir_p(os.path.dirname(path))     return open(path, 'w')  with safe_open_w('/Users/bill/output/output-text.txt') as f:     f.write(...) 

Updated for Python 3:

import os, os.path  def safe_open_w(path):     ''' Open "path" for writing, creating any parent directories as needed.     '''     os.makedirs(os.path.dirname(path), exist_ok=True)     return open(path, 'w')  with safe_open_w('/Users/bill/output/output-text.txt') as f:     f.write(...)