#!/usr/bin/python

"""
if shared folders not working, run this:

sudo adduser $USER vboxsf  

then try again

=====================

goto
http://askubuntu.com/questions/207813/why-does-an-ubuntu-12-10-guest-in-virtualbox-run-very-very-slowly

do this:


# 1111111
# run these command one at a time
# (i.e. dont paste them in all at once)

cd /media/$USER/VBOX*
sudo apt-get install linux-headers-$(uname -r) build-essential
sudo ./VBoxLinuxAdditions.run
sudo bash -c 'echo vboxvideo >> /etc/modules'
sudo shutdown now

## then in the VirtualBox control app

go to Settings>Display
click on "Enable 3d acceleration"

# then reboot and thing should be faster

# also, so speed things up

sudo synaptic
select lubuntu-desktop
select lubuntu-restricted-extras

then log off and on the password screen, change the
desktop manager to lubuntu (look for the white circle)

"""

from go import *
import sys
def say(x):
    sys.stdout.write("["+x+"]")

    
@go
def _string1(fruit="banana"):
    index = 0 
    while index < len(fruit): 
        letter = fruit[index] 
        say(letter) 
        index = index + 1 

print xrange(1,10)

import string
#@go
def _string2():
    "finds 'na' at '2' (i.e. third arg)"
    print string.find("banana", "na")

#@go
def _string3():
    "as above, but starts at 3"
    print string.find("banana", "na", 3)

#@go
def _string4():
    "fails: specificed range has no 'na'"
    print string.find("banana", "na", 2,3)

#@go
def _whites():
    print "[" + string.whitespace+"]"
    for ch in string.whitespace:
        print ord(ch),"["+ch+"]"


#@go
def _lowers():
    print string.lowercase

#@go
def isLower1(ch="a"):
    print string.find(string.lowercase, ch) != -1

#@go 
def isLower2(ch="b"):
    print ch in string.lowercase

#@go
def isLower3(ch="c",banner="hekko there"):
    print banner,'a' <= ch <= 'z'


#@go
def _test1():
    isLower3(banner="work more on python",ch="D")

#@go
def _slice():
    a=[1,2,3,4]
    print 0,a[0]
    print 1,a[1:]
    print 2,a[:2]
    print 1,3,a[1:3]
    print -1,a[-1]

    
#@go
def _alias():
    a = [1, 2, 3]
    b = a
    a[0]=100
    print a,b


#@go
def _clones():
    a = [1, 2, 3]
    b = a[:]
    a[0]=100
    print a,b
    
@go
def _dict():
    inventory = {'apples': 430,
                 'bananas': 312, 'oranges': 525,
             'pears': 217}
    print "\n:all",inventory
    del inventory['pears']
    print "\n:less",inventory
    print "\n:keys",inventory.keys()
    print "\n:values",inventory.values()
    print "\n:parts",inventory.items()
    print "\n:iterate"
    for key,value in inventory.items():
        print ":key",key,":value",value
    

#@go
def _counts():
    seen = {}
    for letter in "Mississippi":
        seen[letter] = seen.get(letter, 0) + 1
    print seen

import copy

class Holds(dict):
    """Dictionary with a default value for unknown keys."""
    def __init__(self, default):
        self.default = default
        
    def __getitem__(self, key):
        if key in self: return self.get(key)
        return self.setdefault(key, copy.deepcopy(self.default))

@go
def _holds1():
    d = Holds(0)
    d['hello'] += 1
    print d

#@go
def _holds2():
    d2 = Holds([])
    d2[1].append('hello')
    d2[2].append('world')
    d2[1].append('there')
    print d2

@go
def _bigrams(words='i am what i am'.split()):
    "Counts of word pairs, in a dict of dicts."
    d = Holds(Holds(0))
    pairs=zip([None] + words, words + [None])
    for (w1, w2) in pairs:
        d[w1][w2] += 1
    print pairs
    print d

# d[w1][w2] += 1 looks better than
# d.setdefault(w1,{}).setdefault(w2, 0); d[w1][w2] += 1