In the tremendously quick moving world, one needs resourceful coding techniques that could help the programmer to sum up voluminous codes in the easiest and also most convenient ways. Arrays are one of the data structures that assist you compose a number of values into a single variable, thereby decreasing the burden of memorizing an enormous number of variables. So let’s go ahead, and see exactly how you can execute Arrays in Python.<\/p>\n
If you are new to Python, get started with the Python Introduction article.<\/p>\n
To use arrays in python language, you need to import the standard \u2018array\u2019 module. This is because array is not a fundamental data type like strings, integer etc. Here is how you can import \u2018array\u2019 module in python :<\/p>\n
from array import *\r\n<\/pre>\nOnce you have imported the \u2018array\u2019 module, you can declare an array. Here is how you do it:<\/p>\n
arrayIdentifierName = array(typecode, [Initializers]\r\n<\/pre>\nIn the declaration above, \u2018arrayIdentifierName\u2019 is the name of array, \u2018typecode\u2019 lets python know the type of array and \u2018Initializers\u2019 are the values with which array is initialized.<\/p>\n
Here is a real world example of python array declaration :<\/p>\n
my_array = array('i',[1,2,3,4])\r\n<\/pre>\nIn the example above, typecode used is \u2018i\u2019. This typecode represents signed integer whose size is 2 bytes.<\/p>\n
Typecodes are the codes that are used to define the type of array values or the type of array. Here is the list of available typecodes:<\/p>\n
On a related topic, you should also know how to use Python Lists effectively.<\/p>\n
Here is a simple example of an array containing 5 integers<\/p>\n
~$ python\r\nPython 2.7.4 (default, Apr 19 2013, 18:28:01)\r\n[GCC 4.7.3] on linux2\r\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\r\n>>> from array import *<\/strong>\r\n>>> my_array = array('i', [1,2,3,4,5])<\/strong>\r\n>>> for i in my_array:<\/strong>\r\n... print(i)<\/strong>\r\n...<\/strong>\r\n1<\/strong>\r\n2<\/strong>\r\n3<\/strong>\r\n4<\/strong>\r\n5<\/strong><\/pre>\nSo this way we can create a simple python array and print it.<\/p>\n
2. Access individual elements through indexes<\/h3>\n
Individual elements can be accessed through indexes. Here is an example :<\/p>\n
>>> my_array[1]\r\n2\r\n>>> my_array[2]\r\n3\r\n>>> my_array[0]\r\n1<\/pre>\nRemember that indexes start from zero.<\/p>\n
3. Append any value to the array using append() method<\/h3>\n
Here is an example :<\/p>\n
>>> my_array.append(6)<\/strong>\r\n>>> my_array\r\narray('i', [1, 2, 3, 4, 5, 6<\/strong>])<\/pre>\nSo we see that the value \u20186\u2019 was appended to the existing array values.<\/p>\n
4. Insert value in an array using insert() method<\/h3>\n
We can use the insert() method to insert a value at any index of the array. Here is an example :<\/p>\n
>>> my_array.insert(0,0)<\/strong>\r\n>>> my_array\r\narray('i', [0<\/strong>, 1, 2, 3, 4, 5, 6])<\/pre>\nIn the above example, using insert() method, the value 0 was inserted at index 0. Note that the first argument is the index while second argument is the value.<\/p>\n
5. Extend python array using extend() method<\/h3>\n
A python array can be extended with more than one value using extend() method. Here is an example :<\/p>\n
>>> my_extnd_array = array('i', [7,8,9,10])\r\n>>> my_array.extend(my_extnd_array)<\/strong>\r\n>>> my_array\r\narray('i', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10<\/strong>])<\/pre>\nSo we see that the array my_array was extended with values from my_extnd_array.<\/p>\n
6. Add items from list into array using fromlist() method<\/h3>\n
Here is an example:<\/p>\n
>>> c=[11,12,13]\r\n>>> my_array.fromlist(c)<\/strong>\r\n>>> my_array\r\narray('i', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13<\/strong>])<\/pre>\nSo we see that the values 11,12 and 13 were added from list \u2018c\u2019 to \u2018my_array\u2019.<\/p>\n
7. Remove any array element using remove() method<\/h3>\n
Here is an example :<\/p>\n
>>> my_array.remove(13)<\/strong>\r\n>>> my_array\r\narray('i', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12])<\/pre>\nSo we see that the element 13 was removed from the array.<\/p>\n
8. Remove last array element using pop() method<\/h3>\n
Here is an example :<\/p>\n
>>> my_array.pop()<\/strong>\r\n12\r\n>>> my_array\r\narray('i', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11])<\/pre>\nSo we see that the last element 12 was popped out of array.<\/p>\n
9. Fetch any element through its index using index() method<\/h3>\n
Here is an example :<\/p>\n
>>> my_array.index(5)<\/strong>\r\n5<\/pre>\nSo we see that the value at index 5 was fetched through this method.<\/p>\n
10. Reverse a python array using reverse() method<\/h3>\n
Here is an example :<\/p>\n
>>> my_array.reverse()<\/strong>\r\n>>> my_array\r\narray('i', [11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0])<\/pre>\nSo we see that the complete array got reversed.<\/p>\n
11. Get array buffer information through buffer_info() method<\/h3>\n
This method provides you the array buffer start address in memory and number of elements in array. Here is an example:<\/p>\n
>>> my_array.buffer_info()<\/strong>\r\n(33881712, 12)<\/pre>\nSo we see that buffer start address and number of elements were provided in output.<\/p>\n
12. Check for number of occurrences of an element using count() method<\/h3>\n
Here is an example :<\/p>\n
>>> my_array.count(11)<\/strong>\r\n1<\/pre>\nSo we see that the element 11 occurred only once in the array.<\/p>\n
13. Convert array to string using tostring() method<\/h3>\n
Here is an example :<\/p>\n
>>> my_char_array = array('c', ['g','e','e','k'])\r\n>>> my_char_array\r\narray('c', 'geek')\r\n>>> my_char_array.tostring()<\/strong>\r\n'geek'<\/pre>\nSo we see that the character array was converted to string using this method.<\/p>\n
14. Convert array to a python list with same elements using tolist() method<\/h3>\n
Here is an example :<\/p>\n
>>> c = my_array.tolist()<\/strong>\r\n>>> c\r\n[11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]<\/pre>\nSo we see that list \u2018c\u2019 was created by using tolist() method on my_array.<\/p>\n
15. Append a string to char array using fromstring() method<\/h3>\n
Here is an example :<\/p>\n
>>> my_char_array.fromstring(\"stuff\")<\/strong>\r\n>>> my_char_array\r\narray('c', 'geekstuff<\/strong>')<\/pre>\nSo we see that the string \u201cstuff\u201d was added to my_char_array.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the tremendously quick moving world, one needs resourceful coding techniques that could help the programmer to sum up voluminous codes in the easiest and also most convenient ways. Arrays are one of the data structures that assist you compose a number of values into a single variable, thereby decreasing the burden of memorizing an […]<\/p>\n","protected":false},"author":1,"featured_media":11382,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[872,1367,1368,1366],"class_list":["post-11380","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","tag-append","tag-declare","tag-index","tag-python-array"],"yoast_head":"\n
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