#26 Python Tutorial for Beginners | Array in Python

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In this lecture we will learn:
What is an array in Python?
Importing the array module
Different functions used with arrays
Fetching all values of an array
Indexing in an array


#1
Array is almost to list with one difference that all the values that are present should be of the same type.
In python, arrays do not have fixed sizes, they can be expanded or shrunk.
We need to import a module known as an array to use the arrays in python.
e.g., import array as arr
At the time of importing the module, you can specify the functions that you will use in the code.
You can also use (*) in place of defining each function separately. * indicates all functions have to be included.
In an array, we have to specify things:
1. Type
2. Value
By changing the type of a value, the size of the allocated memory is also changed.
We have to use the TypeCode to define its type in an array.

#2
Normal integers go from a negative range to a positive range.
Unsigned integers are used when you do not want to store negative values.
A numeric variable is signed if it can represent both positive and negative numbers.
A value will be unsigned if it can only represent non-negative numbers (zero or positive numbers).

#3
buffer info() function gives you the size of an array.
buffer info() function returns two things: an address and the size of an array.
typecode () function is used to return the type code of an array with which you are working.
append() method is used to add a value in an integer.
remove() method is used to remove a value from an array.
reverse() method is used to reverse the order of value of an array.

#4
In python, arrays also support indexing. Values can be fetched through index values.
Array indexing is the same as accessing an array element.
You can access an array element by referring to its index number.
len() function is used to get the length or size of an array.
len() function returns the number of elements present in the array.
We can use both for loop and while loop in different ways to fetch the values of an array.
We can also assign all values of a previous array into a new array one by one.

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