os&files

Os

import os

os.chdir(path) #cd
cwd = os.getcwd() #pwd

Get all files in subdirs

for root, dirs, files in os.walk(PATH_TO_NOTES):
  for file in files:
    curFile = os.path.join(root, file)

Get Environment

os.environ.get('SECRET_KEY')

Files

Underlying open is from io library

#f is file object
 f = open('workfile', 'w')
 f.write("Now the file has one more line!")
 f.close()

Modes

• 'r' read; DEFAULT

• 'w' writing(erase existing file)

• 'w+' writing(create new file if it doesn't exist)

• 'a' appending to the end

• 'a+' appending to the end(create new file if needed)

• 'r+' both reading and writing

Reading Data

for line in f:
    print(line)

f.readline()#leaves \n and '' when done

With

Automatically close for ya

with open('workfile', 'r') as f:
  read_data = f.read() #all datadddddd

Pickle

with open(r"categorizationModel.pickle", "wb") as output_file:
    cPickle.dump(rf, output_file)

with open(r"categorizationModel.pickle", "r") as model:
    rfLoaded = cPickle.load(model)

CPickle

• optimized cousin cPickle written in C, 1000x faster

• just doesn't support subclassing of the Pickler() and Unpickler() classes

• usually better

• same interface

Play Audio Files

os.system("afplay Endgame.mp3")