Python configuration options snippets

1-Constants.py

import os

WORKING_FOLDER = r'C:\Temp'
DATA_FILE = 'grafiti.csv'

with open(os.path.join(WORKING_FOLDER, DATA_FILE), 'rb') as f:
    data = f.readlines()
print(data)

2-Json.py

import json
with open('config.json', 'r') as f:
    config = json.load(f)
print(config['ChunkSettings'])
print(config['KeepData'])
# {u'ChunkNumber': 10, u'ChunkSize': 50} 
# True


#The JSON file contents:
# {
# 	"ChunkSettings": {
# 		"ChunkSize": 50,
# 		"ChunkNumber": 10
# 		},
# 	"KeepData": true
# }

3-ConfigParser.py

# based on https://docs.python.org/3/library/configparser.html
import ConfigParser 
cfg = ConfigParser.ConfigParser()
cfg.read('config.ini')
cfg.sections()
# ['bitbucket.org', 'topsecret.server.com']
cfg.defaults()
# OrderedDict([('serveraliveinterval', '45'), ('compression', 'yes'), 
# ('compressionlevel', '9'), ('forwardx11', 'yes')])
cfg.defaults()['serveraliveinterval']
# '45'

# the contents of config.ini file
# [DEFAULT]
# ServerAliveInterval = 45
# Compression = yes
# CompressionLevel = 9
# ForwardX11 = yes

# [bitbucket.org]
# User = hg

# [topsecret.server.com]
# Port = 50022
# ForwardX11 = no

4-Globals.py

# based on https://stackoverflow.com/a/13034908/3346915
# settings.py
def init():
    global myList
    myList = []

    
# subfile.py
import settings

def stuff():
    settings.myList.append('hey')
    

# main.py
import settings
import subfile

settings.init()          # Call only once
subfile.stuff()         # Do stuff with global var
print settings.myList[0] # Check the result    

5-OSenvironments.py

import os

# Windows env WebDevEnv = Staging
idx = {'Staging': 0, 'Production': 1}[os.getenv('WebDevEnv')]
print idx

gisdata_folder = [r'C:\GISData', r'D:\GISData'][idx]
user = [r'testreader', r'prodreader'][idx]
print(gisdata_folder)
print(user)

# 0
# C:\GISData
# testreader