#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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