Tuples

Tuples are just like lists, but you can't change their values. The values that you give it first up, are the values that you are stuck with for the rest of the program. Again, each value is numbered starting from zero, for easy reference. Example: the names of the months of the year.



In [1]:

    
months = ('January','February','March','April','May','June',\
'July','August','September','October','November','  December')

Lists

Lists are what they seem - a list of values. Each one of them is numbered, starting from zero - the first one is numbered zero, the second 1, the third 2, etc. You can remove values from the list, and add new values to the end. Example: Your many cats' names.



In [2]:

    
cats = ['Tom', 'Snappy', 'Kitty', 'Jessie', 'Chester']



In [4]:

    
print (cats[2])









    



Kitty



In [5]:

    
cats.append('Catherine')

Dictionaries

Dictionaries are similar to what their name suggests - a dictionary. In a dictionary, you have an 'index' of words, and for each of them a definition. In python, the word is called a 'key', and the definition a 'value'. The values in a dictionary aren't numbered - tare similar to what their name suggests - a dictionary. In a dictionary, you have an 'index' of words, and for each of them a definition. In python, the word is called a 'key', and the definition a 'value'. The values in a dictionary aren't numbered - they aren't in any specific order, either - the key does the same thing. You can add, remove, and modify the values in dictionaries. Example: telephone book.



In [6]:

    
#Make the phone book:
phonebook = {'Andrew Parson':8806336, \
'Emily Everett':6784346, 'Peter Power':7658344, \
'Lewis Lame':1122345}



In [8]:

    
#Add the person 'Ram' to the phonebook:

phonebook['Ram'] = 1234567



In [9]:

    
del phonebook['Andrew Parson']