Dictionary.py

dict ={'size' : 1, 'value' : 'bla'}

#opposite as list they are not ordered!!
dict2 ={'value' : 'bla', 'size' : 1}
dict1 == dict2 #evaluates as True

#they are mutable data

'value' in dict
'value' not in dict

list(dict.keys())
list(dict.values())
list(dict.items())

#iterations
for k in dict.keys() :
for k in dict.values() :
for k, v in dict.items() :
#print a set of tuple. Same as list but no square brackets, and they are immutable
for i in dict.items() :


if 'size' in dict
    print(dict['size'])
dict.get('size', 0)   #get the value, default if it doesn't exist

#to be sure the key is existing, before we assign a value to it
dict.setdefault('char', 0); #if the key is not existing add it and assign value 0, return the value otherwise

dict[char] = 1;

##########################
Data structure

myList = [{'a' : 1, 'b' : 2}, {'c' : 1, 'd' : 2}] #list of dictionaries