/Python/How to define a dictionary in python

How to define a dictionary in python

Dictionary in python

dict = {"apple": "fruit", "ball": "object", "cricket": "sports"}

#how to print?

print(dict["cricket"])

Dictionary in python

d = {'key1':'value1','key2':'value2'}
print(d) # to print full dictionary
l=d.keys
print(l)   # to print keys
b=d.values
print(b)#to print values in dictionary

Dictionary in python

#A dictionary has key-value pairs. Here 1,2,3 are the keys and Item1,Item2,Item3 
#are their values respectively. 
dictionaryName = { 1: "Item1", 2: "Item2", 3: "Item3"}

#retrieving value of a particular key
dictionaryName[1]

#retrieving all the keys in a dictionary
dictionaryName.keys()

#retrieving all the values in a dictionary
dictionaryName.values()

How to use dictionary in python

#dictionary
programming = {
    "Bugs": "These are the places of code which dose not let your program run successfully"
    ,"Functions":"This is a block in which you put a peice of code"
    ,"shell":"This is a place where the code is exicuted"
    }
print(programming["Bugs"])
print(programming["shell"])
#error
#print(programming["pugs"])

Dictionary in python

my_dict = {"key": "value", "a": 1, 2: "b"}
print(my_dict["key"])
# Output: value
print(my_dict["a"])
# Output: 1
print(my_dict[2])
# Output: b

How to define a dictionary in python

population = {"Shanghai":17.8, "Istanbul":13.3, "Karachi":13.0, "Mumbai":12.5}

#Consider the following when creating a dictionary
#	1. Must be inside {}
#	2. Have two parts in an item 
#			Key - e.g. Istanbul and Value - e.g. 13.3
#	3. There must be a colon ":" between the key and the value
#	4. Item must be seperated by commas ","
#	3. Any immutable type can be used as keys (not only integers like in lists)

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