** Python Certification Training: https://www.edureka.co/python **
This Edureka PPT on 'Arrays in Python' will help you establish a strong hold on all the fundamentals in the Python programming language. Below are the topics covered in this PPT:
What is an array?
Is python list same as an array?
How to create arrays in python?
Accessing array elements
Basic array operations
- Finding the length of an array
- Adding Elements
- Removing elements
- Array concatenation
- Slicing
- Looping
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Other than some generic containers like list, Python in its definition can also handle containers with specified data types. Array can be handled in python by module named “array“. They can be useful when we have to manipulate only a specific data type values.
Other than some generic containers like list, Python in its definition can also handle containers with specified data types. Array can be handled in python by module named “array“. They can be useful when we have to manipulate only a specific data type values.
A class is a code template for creating objects. Objects have member variables and have behaviour associated with them. In python a class is created by the keyword class.
An object is created using the constructor of the class. This object will then be called the instance of the class.
2D array in C++ language ,define the concept of c++ Two-Dimensional array .with example .and also Accessing Array Components concept.and Processing Two-Dimensional Arrays.
A class is a code template for creating objects. Objects have member variables and have behaviour associated with them. In python a class is created by the keyword class.
An object is created using the constructor of the class. This object will then be called the instance of the class.
2D array in C++ language ,define the concept of c++ Two-Dimensional array .with example .and also Accessing Array Components concept.and Processing Two-Dimensional Arrays.
( ** Java Certification Training: https://www.edureka.co/java-j2ee-soa-training ** )
This Edureka tutorial on “Java ArrayList” (Java blog series: https://goo.gl/osrGrS) will give you a brief insight about ArrayList in Java and its various constructors and methods along with an example. Through this tutorial, you will learn the following topics:
Collections Framework
Hierarchy of ArrayList
What is ArrayList
Internal Working of ArrayList
Constructors of ArrayList
Constructors Example
ArrayList Methods
Methods Example and Demo
Advantages of ArrayList over Arrays
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In this chapter we are going to get familiar with some of the basic presentations of data in programming: lists and linear data structures. Very often in order to solve a given problem we need to work with a sequence of elements. For example, to read completely this book we have to read sequentially each page, i.e. to traverse sequentially each of the elements of the set of the pages in the book. Depending on the task, we have to apply different operations on this set of data. In this chapter we will introduce the concept of abstract data types (ADT) and will explain how a certain ADT can have multiple different implementations. After that we shall explore how and when to use lists and their implementations (linked list, doubly-linked list and array-list). We are going to see how for a given task one structure may be more convenient than another. We are going to consider the structures "stack" and "queue", as well as their applications. We are going to get familiar with some implementations of these structures.
Getting StartedCreate a class called Lab8. Use the same setup for .pdfinfo309708
Getting Started
Create a class called Lab8. Use the same setup for setting up your class and main method as you
did for the previous assignments. Be sure to name your file Lab8.java. Additionally, make
another file called Arrays.java. This file will be an object, so simply start it off by declaring an
Arrays class. You can copy the following skeleton and fill in the appropriate code below each of
the comments:
public class Arrays {
/ Instance Variables
// Constructors
// findMin 1
// findMax
// calcSum
// calcAverage
// toString
}
Task Overview
Your task for this lab is to create a class called Arrays with some array processing methods. This
class will maintain an array and the number of elements present in it. Additionally, methods will
be available to display the current min and max elements along with the average of all of them.
Finally, a toString() method will be available to cleanly display all the array elements. Finally,
you will write a simple driver class to test out the above Arrays class.
Part 1: Instance Variables for Arrays
The first thing to do for the Arrays class is to set up its instance variables. Declare the following
(private) instance variables:
• An int array called array ? this will be the array we will be writing methods for.
• An int called count - this represents the number of valid elements in the array.
Part 2:
Constructors for Arrays The Arrays class will have two constructors. The first constructor takes
the maximum size of the array as input as a parameter and initializes the array instance variable
appropriately. It also sets count to size. Finally, it will initialize all of the array elements to some
values between 0 and 10, inclusive. To create this constructor, follow these steps:
• Import java.util.Random to make use of the random number generator.
• Create a constructor with the following header: public Arrays(int size)
• Initialize your array variable and set its size to size (see the chart on page 252 for reference on
initializing arrays). Be very careful that you are setting the value of your array instance variable,
as opposed to creating a new variable called array.
• Set the value of the count variable to size because we will be populating the entire array.
• Copy the following code to the constructor in order to generate random values between 0 and
10, inclusive:
Random rand = new Random();
for (int i = 0; i < count; i++)
{
array[i] = (rand.nextInt(10));
}
Next, create another constructor with the following header: public Arrays(int[] arr). This
constructor will initialize the class by using the passed arr argument in order to fill its instance
variables. The following things need to be done inside of this constructor:
• Set the array variable equal to arr.
• Set the count variable equal to the length of the array.
Part 3: Displaying the Output findMin()
The first method of this class will search the array for the minimum element. Copy the following
code for the findMin method. Note how the count i.
Similar to Arrays In Python | Python Array Operations | Edureka (20)
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Register Here: https://resources.edureka.co/21-days-learning-plan-webinar/
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Arrays In Python | Python Array Operations | Edureka
1.
2. What is an Array?
How to Create an Array in Python?
Is Python List same as an Array?
Basic Array Operations
• Finding the length of an Array
• Addition
• Removal
• Concatenation
• Slicing
• Looping
Accessing Array Elements
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4. What is an Array?
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→ a
a[0] a[1] a[2] a[3…98] a[99]
1 2 3 … 100
Var_Name
Values →
Index →
Basic structure
of an Array:
An array is basically a data structure which can hold more than one value at a
time. It is a collection or ordered series of elements of the same type.
6. Is Python List same as an Array?
Python Arrays and lists have the
same way of storing data.
Arrays take only a single data type
elements but lists can have any
type of data.
Therefore, other than a few
operations, the kind of operations
performed on them are different.
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7. How to create Arrays in Python?
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8. Arrays in Python can be created after importing the array module.
How to create Arrays in Python?
→ from array import *
USING *
3
→ import array → import array as arr
WITHOUT ALIAS
1 USING ALIAS
2
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10. ❑ Access elements using index values.
❑ Indexing starts at 0 and not from 1. Hence, the index number is always 1 less than the length
of the array.
❑ Negative index values can be used as well. The point to remember is that negative indexing
starts from the reverse order of traversal i.e from right to left.
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a[2]=3
Example: a[2]=3
Accessing Array Elements
12. Operations
Removing/ Deleting
elements of an array
Slicing
Looping through an Array
Basic Array Operations
Adding/ Changing
element of an Array
Finding the length of an
Array
Array ConcatenationArray Concatenation
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14. ❑ Length of an array is the number of elements that are actually present in an array.
❑ You can make use of len() function to achieve this.
❑ The len() function returns an integer value that is equal to the number of elements present in that array.
Finding the length of an Array
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17. js
Insert()extend()append()
Used when you want to add
a single element at the end
of an array.
Used when you want to add
more than one element at
the end of an array.
Used when you want to add
an element at a specific
position in an array.
Functions used to add elements to an Array:
Adding elements to an Array
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20. Removing elements of an Array
js
pop() remove()
Used when you want to
remove an element and
return it.
Used when you want to
remove an element with a
specific value without
returning it.
Functions used to remove elements of an Array:
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21. Thecodesnippetbelowshowshowyoucanremoveelementsusingthesetwofunctions:
import array as arr
a=arr.array('d', [1.1, 2.2, 3.8, 3.1, 3.7])
print(“Popping last element”,a.pop())
print(“Popping 4th element”,a.pop(3))
a.remove(1.1)
print(a)
Popping last element 3.7
Popping 4th element 3.1
array('d', [2.2, 3.8])
OUTPUT-
Removing elements of an Array
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25. Slicing an Array
import array as arr
a=arr.array('d',[1.1 , 2.1 ,3.1,2.6,7.8])
print(a[0:3])
OUTPUT -
array(‘d’, [1.1, 2.1, 3.1])
An array can be sliced using the : symbol. This returns a range of elements that we have
specified by the index numbers.
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27. js
for while
Iterates over the items of an
array specified number of
times.
Iterates over the elements
until a certain condition is met.
We can loop through an array easily using the for and while loops.
Looping through an Array
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28. Some of the for loop implementations are:
import array as arr
a=arr.array('d', [1.1, 2.2, 3.8, 3.1, 3.7])
print("All values")
for x in a:
print(x)
Allvalues
1.1
2.2
3.8
3.1
3.7
OUTPUT-
Looping through an Array using for loop
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29. Example for while loop implementation
Looping through an Array using while loop
import array as arr
a=arr.array('d', [1.1, 2.2, 3.8, 3.1, 3.7])
b=0
while b<len(a):
print(a[b])
b=b+1
1.1
2.2
3.8
3.1
3.7
OUTPUT-
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