A quick fix for DropboxSync to stop it crashing in Pythonista 1.4 when trying to write to Inbox by forcing it not to write to Inbox. There are probably more elegant solutions...

DropboxSync.py

import os
import sys
import pickle
import console

# I moved 'dropboxlogin' into a sub folder so it doesn't clutter my main folder
sys.path += [os.path.join(os.path.dirname(os.path.abspath(__file__)), 'lib')]
import dropboxlogin # this code can be found here https://gist.github.com/4034526

STATE_FILE = '.dropbox_state'

class dropbox_state:
	def __init__(self):
		self.cursor = None
		self.local_files = {}
		self.remote_files = {}
	
	# use ignore_path to prevent download of recently uploaded files 
	def execute_delta(self, client, ignore_path = None):
		delta = client.delta(self.cursor)
		self.cursor = delta['cursor']
		
		for entry in delta['entries']:
			path = entry[0][1:]
			meta = entry[1]
			
			# this skips the path if we just uploaded it
			if path != ignore_path:
				if meta != None:
					path = meta['path'][1:] # caps sensitive
					if meta['is_dir']:
						print '\n\tMaking Directory:',path
						self.makedir_local(path)
					elif path not in self.remote_files:
						print '\n\tNot in local'
						self.download(client, path)
					elif meta['rev'] != self.remote_files[path]['rev']:
						print '\n\tOutdated revision'
						self.download(client, path)
				# remove file or directory
				else: 
					if os.path.isdir(path):
						print '\n\tRemoving Directory:', path
						os.removedirs(path)
					elif os.path.isfile(path):
						print '\n\tRemoving File:', path
						os.remove(path)
						
						del self.local_files[path]
						del self.remote_files[path]
					else:
						pass # file already doesn't exist localy

	# makes dirs if necessary, downloads, and adds to local state data
	def download(self, client, path):
		print '\tDownloading:', path
		# TODO: what if there is a folder there...?
		head, tail = os.path.split(path)
		# omit files in Inbox _ next line and indent added by sidewinder42
		if not head=='Inbox':
			# make the folder if it doesn't exist yet
			if not os.path.exists(head) and head != '':
				os.makedirs(head)
			#open file to write
			local = open(path,'w')
			remote, meta = client.get_file_and_metadata(os.path.join('/',path))
			local.write(remote.read())
			#clean up
			remote.close()
			local.close()
			# add to local repository
			self.local_files[path] = {'modified': os.path.getmtime(path)}
			self.remote_files[path] = meta
	
	def upload(self, client, path):
		print '\tUploading:', path
		local = open(path,'r')
		meta = client.put_file(os.path.join('/',path), local, True)
		local.close()
		
		self.local_files[path] = {'modified': os.path.getmtime(path)}
		self.remote_files[path] = meta
		
		# clean out the delta for the file upload
		self.execute_delta(client, ignore_path=meta['path'])
	
	def delete(self, client, path):
		print '\tFile deleted locally. Deleting on Dropbox:',path
		try:
			client.file_delete(path)
		except:
			# file was probably already deleted
			print '\tFile already removed from Dropbox'
			
		del self.local_files[path]
		del self.remote_files[path]
		
	# safely makes local dir
	def makedir_local(self,path):
		if not os.path.exists(path): # no need to make a dir that exists
			os.makedirs(path)
		elif os.path.isfile(path): # if there is a file there ditch it
			os.remove(path)
			del self.files[path]
			
			os.makedir(path)

	# recursively list files on dropbox
	def _listfiles(self, client, path = '/'):
		meta = client.metadata(path)
		filelist = []
		
		for item in meta['contents']:
			if item['is_dir']:
				filelist += self._listfiles(client,item['path'])
			else:
				filelist.append(item['path'])
		return filelist
				
	def download_all(self, client, path = '/'):
		filelist = self._listfiles(client)
		for file in filelist:
			self.download(client, file[1:])	# trim root slash
	
	def check_state(self, client, path):
		# lets see if we've seen it before
		if path not in self.local_files:
			# upload it!
			self.upload(client, path)
		elif os.path.getmtime(path) > self.local_files[path]['modified']:
			# newer file than last sync
			self.upload(client, path)
		else:
			pass # looks like everything is good
			
def loadstate():
	fyle = open(STATE_FILE,'r')
	state = pickle.load(fyle)
	fyle.close()
	
	return state

def savestate(state):
	fyle = open(STATE_FILE,'w')
	pickle.dump(state,fyle)
	fyle.close()
	
if __name__ == '__main__':
	console.show_activity()
	
	print """
****************************************
*     Dropbox File Syncronization      *
****************************************"""

	client = dropboxlogin.get_client()
	print '\nLoading local state'
	# lets see if we can unpickle
	try:
		state = loadstate()
	except:
		print '\nCannot find state file. ***Making new local state***'
		# Aaaah, we have nothing, probably first run
		state = dropbox_state()
		
		print '\nDownloading everything from Dropbox'
		# no way to check what we have locally is newer, gratuitous dl
		state.download_all(client)

	print '\nUpdating state from Dropbox'
	state.execute_delta(client)
		
	
	print '\nChecking for new or updated local files'
	# back to business, lets see if there is anything new or changed localy
	filelist = []
	for root, dirnames, filenames in os.walk('.'):
		for filename in filenames:
			if filename != STATE_FILE:
				filelist.append( os.path.join(root, filename)[2:])
	
	for file in filelist:
		state.check_state(client,file)
		
	print '\nChecking for deleted local files'
	old_list = state.local_files.keys()
	for file in old_list:
		if file not in filelist:
			state.delete(client, file)
	
	print '\nSaving local state'
	savestate(state)
	
	print '\nSync complete'
	

You might try putting console.set_idle_timer_disabled(True) at the top of the script to keep your device awake for the longer syncs.

Could we make this a repo instead of a gist to improve collaboration?

Shouldn't dropboxlogin go in the standard site-packages directory instead of the idiosyncratic lib directory?