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Python Lists

Introduction

Python is one of the world's most widely held programming languages, and the reason behind its popular acceptance includes, not limited to:

· Use of simple and intuitive syntax which resembles to simple English

· Python is object-oriented programming language, everything in python considered as an object with different characteristics. Python allows working on various objects.

· Python has features to integrated with different software or components of a software for data cleaning, analysis, and interpretation.

Lists

There are four built-in data types in python, namely Lists, Tuples, Sets and Dictionaries. Lists are mainly used to store multiple items in a single variable.

- Lists are prepared placing all data elements in a square bracket which are separated by comma.

- Single list can contain different data types like float, integer, or string.

- We can place lists inside the list, and it is called nested list.

Example of creating empty list


#Empty List
Departments = []

Example of creating a list containing string values



#List Containing departments In the Hospital
Departments = ["OutPatient", "Inpatient", "Dermatology", "STI", "Surgical", "Onchology", "Optalmology"]
print(Departments)

Output

['OutPatient', 'Inpatient', 'Dermatology', 'STI', 'Surgical', 'Onchology', 'Optalmology']

Examples of lists inside the list...called Nested List


#List containing other lists...Nested List
Departments = ["OutPatient", "Inpatient", "Dermatology", "STI", "Surgical", "Onchology", "Optalmology"]
Departments_2 = [Departments, 4, 5, "Laboratory", "Pharmacy", "ART-Clinic"]
print(Departments_2)

Output

[['OutPatient', 'Inpatient', 'Dermatology', 'STI', 'Surgical', 'Onchology', 'Optalmology'], 4, 5, 'Laboratory', 'Pharmacy', 'ART-Clinic']

Accessing Data from Lists

We do have different types of options to see and manipulate lists in python.

1. Indexing

- Lists are saved in ordered form and they are indexed beginning from [0]. This means the 1st data element will be indexed as 0, the 2nd will be indexed as 1.


#Displaying Lists using Indexes
Departments = ["OutPatient", "Inpatient", "Dermatology", "STI", "Surgical", "Onchology", "Optalmology"]
print(Departments[0])
print(Departments[1])
#displaying range of values from the list
print(Departments[0:4])

Output

OutPatient
Inpatient
['OutPatient', 'Inpatient', 'Dermatology', 'STI']

2. List Length

- To count the number of items in the list we can use len () as shown below.


#To see how many items are in the list
Departments = ["OutPatient", "Inpatient", "Dermatology", "STI", "Surgical", "Onchology", "Optalmology"]
print(len(Departments))
Departments_2 = [Departments, 4, 5, "Laboratory", "Pharmacy", "ART-Clinic"]
print(len(Departments_2))

Output

7
6

Thank you.


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