Python Script Collections

serial_related.py

# Scan Serial Ports (for Serial Communication Device, such as GPS, Arduino, etc.)
import serial

def scanports():
  found = False
  for i in range(64):
    try:
      ser = serial.Serial(i) # for windows version
      # in linux, you should use "named port" to open(e.g. serial.Serial('/dev/ttyACM0'), etc.)
      ser.close()
      print "Found at COM ", i+1
      found = True
    except serial.serialutil.SerialException:
      pass
    
  if not found:
    print "No Serial Device is found."
    

utilities.py

### get command history in interactive environment ###
import readline
for i in range(readline.get_current_history_length()): 
  print readline.get_history_item(i)


### find string patterns in text file ###
f = open('some.txt')
text = f.read()
f.close()

import re
re.findall('src="\S+"', text) # ref http://docs.python.org/2/howto/regex.html


### filtering a list ###
imgFiles = [i.split('/')[-1] for i in imgLinks if i.startwith('http')] # get the file names of the images with full links in the list


### exporting list to plain text file ###
outfile = open('plain.txt', 'w')
outfile.writelines("%s\n" % s for s in str_list)
outfile.close()


### exporting list to json string
import json
json.dumps(items) # one line contains all
json.dumps(items, indent=4) # pretty-printed
## to file
json.dump(items, items_json) # notice the "dump" without "s"
json.dump(items, items_json, indent=2) # pretty-printed