#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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