In this article you will learn about Python arrays method
Python arrays method – Before moving ahead, let’s know a little bit about Introduction to Python Array
Arrays – It is used to hold any number of values in one variable. However, Python doesn’t not built-in support of arrays, but a list can be used as an array. Using an array is quite simple, Python needs to import its library for this.
Python has some set of built-in methods which can be used on array or list.
clear() method – It clears or removes the all items of the list.
Syntax - list.clear() Parameter Values - No parameter values.
Example 1- Use of clear() method to get an empty list.
x =['ab', 'cd', 'ef', 'gh'] x.clear() print(x)
Explanation – As it is shown clearly that it removed all elements of array and returned an empty list.
copy() method – It returns a list of copy of original list.
Syntax - list. copy() Parameter Values - No parameter values.
Example 2- Use of copy() method to copy a list.
x =['ab', 'cd', 'ef', 'gh'] x.copy() print(x)
Explanation – As it is shown clearly that it returned the copy of whole existing array.
count() method – It returns the number of specified value.
Syntax - list.count(value) Parameter Values - value - It is required argument. The specified value to be counted.
Example 3- It returns the number of ‘a’ present in the list.
x =['a', 'b', 'c', 'a', 'd', 'e', 'a']
z = x.count('a')
print(z)
Explanation – As it is shown clearly that it returned the number of letter ‘a’ appeared in array.
extend() method – It adds the elements of a new list in the original list.
Syntax - list.extend(value) Parameter Values- value - It is required argument. The list of elements to be added.
Example 4- It returns original list with including new elements.
x =['ab', 'cd', 'ef', 'gh'] z = ['q', 'w', 'e'] x.extend(z) print(x)
Explanation – As it is shown clearly that it returned a new array after adding a list in it.
insert() method – It adds a specified value at specified index number.
Syntax - list.insert(index number, element) Parameter Values - index number - Where to be inserted specified element. element - The specified value to be inserted.
Example 5- Use of insert() method to insert specified element.
x =['ab', 'cd', 'ef', 'gh'] z = x.insert(1, 'we') print(z)
Explanation – As it is shown clearly that it returned a new array after inserting a string at the specified index number.
reverse() method – It returns the reverse version of original list.
Syntax - list.reverse() Parameter Values - No parameter values.
Example 6- Use of reverse() method to reverse the list.
x = ['a', 'b', 'c', 'd', 'e'] x.reverse() print(x)
Explanation – As it is shown clearly that it returned array with the reverse order of elements.
sort() method – By default it returns elements of list in ascending order.
Syntax - list.sort(reverse= True|False, key=Func) Parameter Values - reverse - It is optional argument. By default it will arrange elements in ascending order otherwise reverse=True will sort the list in descending order. Key - It is optional argument. A function to be specified the sorting criteria.
Example 7- Use of sort() method to arrange elements of the list by default.
x = ['d', 'a', 'c', 'e', 'b'] x.sort() print(x)
Explanation – As it is shown clearly that it retuned array after arranging elements in ascending order.
Example 8- Use of sort() method to arrange elements of the list in descending order.
x = ['d', 'a', 'c', 'e', 'b'] x.sort(reverse=True) print(x)
Explanation – As it is shown clearly that it retuned array after arranging elements in descending order. Here reverse=True, therefore it returned in descending order otherwise, it would returned it ascending order.
Example 9- Sort the list by the length of the values.
def myFunc(n): return len (n) x = ['a', 'b', 'c', 'd', 'e'] x.sort(key=myFunc) print(x)
Explanation – As it is shown clearly that it returned an array after arranging the elements according to length.
Example 10- Sort the list in descending order by the length of the values and reversed
def myFunc(n): return len (n) x = ['a', 'def', 'bc', 'jklm', 'ghi'] x.sort(key=myFunc) print(x)
Explanation – As it is shown clearly that it returned an array after arranging the elements according to length.
If you find anything incorrect in the above-discussed topic and have any further questions, please comment down below.
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