ratings = Hash.new 0
ratings['Harry Porter'] += 1

from collections import defaultdict
a = {}
a = defaultdict(lambda:0,a)
a['Harry Porter'] += 1

#another way
class Counter(dict):
	def __missing__(self, key):
		return 0
c = Counter()
c['a'] += 1

5.times { print 'hello world'}

Dir.entries "/"
Dir.entries "."
Dir["t.py"]
print File.read("t.py")
FileUtils.cp("/comics.txt", "/Home/comics.txt")

File.open("/Home/comics.txt", "a") do |f|
	f << "Cat and Girl"
end
FIle.mtime("/Home/comics")
FIle.mtime("/Home/comics").hour

def load_weather(path)
	days = {}
	File.foreach(path) do |line|
		day, weather = line.split(': ')
		days[day] = weather
	end
	days
end

require 'popup'

class BlogEntry
	attr_accessor :title, :time, :fulltext, :mood
end
entry = BlogEntry.new
entry.title = "today's moive"
entry.time = Time.now
entry.mood = :sick

class BlogEntry
	def initialize(title, mood, fulltext)
		@time = Time.now
		@title, @mood, @fulltext = title, mood, fulltext
	end
end

#find by id = 1
Zombie.find(1)
#create
Zombie.create
#find last
Zombie.last
#find all order by names
Zombie.all.order(:name)
#update
Zombie.find(1).update(name:'alibaba')
#delete
Zombie.find(1).delete