Useful snippets for working with files and paths in python

os_and_pathlib.py

import os
from pathlib import Path

# Absolute path of file 
absolute_path = os.path.dirname(os.path.abspath(__file__))
# OR
absolute_path = Path(__file__).resolve()

# List contents of directory
os.listdir('dirname-or-blank-for-current-dir')
Path("dir").ls()

# Iterate through directory
for f in Path("dir").iterdir():
  
# Get current directory
os.getcwd()
Path.cwd() # static method

# check if file or directory exists
os.is_file("file")
os.is_dir("dir")
Path("file-or-dir").exists()
Path("file").is_file()
Path("dir").is_dir()

# Concatenate path
# to get /first/second/third
os.path.join("first","second","third")
Path('first') / "second" / "third"

# Make a directory
os.mkdir("dir_name")
Path("new_dir").mkdir()
Path("/parents/that/dont/exist/new_dir").mkdir(parents=True) # add parents if they don't exist
Path("alrady_existing_dir").mkdir(exist_ok=True) # won't raise errors if it already exists

# Environment variables
os.environ['specific_env_var']
os.environ #all env vars