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:

#!/usr/bin/python

#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:

#!/usr/bin/python

#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

An example of using a dictionary function:

#!/usr/bin/python

#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

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

#!/usr/bin/python

#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
biodata1.clear()
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
biodata4.update(biodataBaru)
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?