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How to use a python dictionary example

After discussing list and tuple data types in the previous article, there is another array data type in Python, namely dictionaries. In a list or tuple, the index/key of the array does not need to be specified, while in the dictionary we have to specify it ourselves. Each key is separated by its value using a “:” sign. Like lists and tuples, each item in a dictionary is separated by a comma, starting and ending with curly braces.

Each key must be unique in one dictionary while the values ​​are independent. Value can contain anything, while key must be a string or number. Below is an example dictionary:


#membuat dictionary
biodata = {"Nama': 'Wayan', 'Asal': 'Gianyar', 'Umur': 21, 'NoUrut': 1};

#menampilkan nama
print "Nama : ", biodata['Nama'];

#menampilkan no urut
print "No Urut: ", biodata['NoUrut'];

So, according to the example above displays the value based on the key from the dictionary.

Unlike tuples, the data in the dictionary can be updated:


#membuat dictionary
biodata = {'Nama': 'Wayan', 'Asal': 'Gianyar', 'Umur': 21, 'NoUrut': 1};

#menambahkan data
biodata['JenisKelamin'] = 'Pria';

#menampilkan data baru
print "Jenis Kelamin: ", biodata['JenisKelamin'];

We can also delete data in the dictionary, there are 3 scripts that we can use as needed:

del biodata['Nama']; # menghapus key Nama
biodata.clear(); # menghapus semua key pada dictionary
del biodata; # menghapus dictionary

Multiple functions in dictionary

Function Explanation
cmp(d1,d2) Comparing dictionaries d1 and d2
only (biodata) Displays the number of items from the dictionary
str (biodata) Returns a string representation of a dictionary

An example of using a dictionary function:


#membuat dictionary
biodata1 = {'Nama': 'Wayan', 'Asal': 'Gianyar', 'Umur': 21, 'NoUrut': 1};
biodata2 = {'Nama': 'Made', 'Asal': 'Denpasar', 'Umur': 23, 'NoUrut': 2};
biodata3 = {'Nama': 'Nyoman', 'Asal': 'Gianyar', 'Umur': 21, 'NoUrut': 3};
biodata4 = {'Nama': 'Wayan', 'Asal': 'Gianyar', 'Umur': 21, 'NoUrut': 1};

#membandingkan dictionary
print "Hasil perbandingan biodata1 dan biodata2 : %d" % cmp (biodata1, biodata2)
print "Hasil perbandingan biodata1 dan biodata3 : %d" % cmp (biodata1, biodata3)
print "Hasil perbandingan biodata1 dan biodata4 : %d" % cmp (biodata1, biodata4)

#mendapatkan jumlah item dictionary
print "Panjang biodata1 : %d" % len (biodata1)

#menampilkan value dalam string
print "String : %s" % str (biodata1)

Then there are methods that can be used in the dictionary

Method Explanation
biodata.clear() Delete all keys in the biodata dictionary
biodata.copy() Copy the entire key in the biodata dictionary
biodata.fromkeys() Create a new dictionary with key based on dictonary biodata
biodata.get() Returns the value of the given key
biodata.has_key() Returns true if the key is found in the dictionary, and vice versa
biodata.items() Returns a dictionary item to a (key,value) tuple-like
biodata.keys() Get all the keys in the dictionary
biodata.setdefault() Same as get(), but can be used to set all values ​​for each new key
biodata1.update(biodata2) Combining dictionary biodata2 with biodata1
biodata1.values() Displays all values ​​in dictionary

Example of using the method above, I made a file:


#membuat dictionary
biodata1 = {'Nama': 'Wayan', 'Asal': 'Gianyar', 'Umur': 21, 'NoUrut': 1};
biodata2 = {'Nama': 'Made', 'Asal': 'Denpasar', 'Umur': 23, 'NoUrut': 2};
biodata3 = {'Nama': 'Nyoman', 'Asal': 'Gianyar', 'Umur': 21, 'NoUrut': 3};
biodata4 = {'Nama': 'Wayan', 'Asal': 'Gianyar', 'Umur': 21, 'NoUrut': 1};
temp = ('Nama','Asal','Umur','NoUrut');
biodataBaru = {'JenisKelamin' : 'pria' }

#menghapus semua item dictionary biodata1
print "Jumlah setelah dihapus : %d" % len(biodata1)

#meng-copy dictionary biodata4 ke biodata1
biodata1 = biodata4.copy()
print "biodata1 : %s" % str(biodata1)

#membuat dictionary baru dari temp
biodata5 = biodata5.fromkeys(temp)
print "Dictionary biodata5 : %s" % str(biodata5)

#mengembalikan nilai dari key
print "Value : %s" % biodata2.get('NoUrut')

#mengecek key dari dictionary
print "Value : %s" % biodata2.has_key('Nama')

#merubah item menjadi list
print "Value : %s" % biodata2.items()

#menampilkan semua key
print "Key : %s" % biodata3.keys()

#menambah item dengan default value
print "Item baru : %s" % biodata4.setdefault('Hobi', None)

#mengupdate dictionary
print "Update biodata4 : %s" % biodata4

#menampilkan semua value dari dictionary
print "Semua value : %s" % biodata4.values()

Hope it’s useful

What is a dictionary in Python?

Dictionary is the data type on python which works to store groups of data/values ​​with a “key-value” approach.

What is a dictionary data type?

Dictionary is data type in Python that works to store groups data or values, each of which contains a key and a value.

A data structure that looks like a dictionary has keywords and then there is a value. The keyword must be unique, while the value can be filled with anything. What is the data type?

Dictionary is a structure data that looks like a dictionary. There are keywords then there are the value. Keywords must be unique, while values ​​can be filled with anything. In the example above we create a Dictionary named me with isi name data and URLs.

What are Python data structures?

Now we will study the data structure of List, Tuple, Set, and Dictionary..

1. Lists. A list is a data structure in the python programming language that is capable of storing a collection of data (objects/values), which are called list elements. The elements in the list are stored in a certain order. … .

2. Tuple. … .

3. Set..


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