working with dictionary

# dictionary
school={'techers':7,'students':20,'janitor':1,'cook':3,'principal':1,'cashier':2}
print school

#updating a dictionary
school["sponsor"]=6
print school

#printing key and values in a dict
print school.keys()

#print value of a key
print school['students']

#deleting an item from diet
del(school['janitor'])
print school
print len(school)

#empty diet
menu={}
menu['wine']=21.50
menu['rice']=12.5
menu['fufu']=13
menu['peza']=24.6
menu['cake']=3.00
menu['frie chicken']=5.00
menu['softdrink']=35.00
menu['cornbread']=45.00
menu['dosa']=16.00
print menu

for item in menu:
    print menu[item]
for key,value in menu.items():
    print key,value

citizens={'liberia':'liberians','Nigeria':'nigerians','Americans':['chinese','europeans','africans','asians']}
print citizens

#using for loops
for key,value in citizens.items():
    print key,value
citizens['Americans'].sort()
print citizens

citizens['brazil']=['brazilians','south american']
print citizens