Variables & Data Types in Python Explained for Pharmacy Students (With Dose & PK Examples)

Understanding variables and data types is the foundation of Python programming. In pharmaceutical sciences, these concepts are used to store and manipulate values such as drug dose, concentration, patient data, and clinical observations.

🔷 What is a Variable in Python?

A variable is a container used to store data values.

dose = 500

Here, dose is a variable storing the value 500 mg.

🔷 Rules for Naming Variables

• Must start with a letter or underscore
• Cannot start with a number
• No spaces allowed
• Case-sensitive (Dose ≠ dose)

🔷 Data Types in Python

Data types define the type of value a variable can store.

🔷 Checking Data Type

dose = 500
print(type(dose))

This will display the type of the variable.

🔷 Type Casting

Type casting means converting one data type into another.

dose = "500"
dose_int = int(dose)

Here, string “500” is converted into integer 500.

🔷 Assigning Multiple Variables

dose, conc, drug = 500, 2.5, "Paracetamol"

💊 Pharmaceutical Application

Consider a pharmacokinetic study:

dose = 500          # mg
concentration = 2.5 # mg/mL
patient_name = "John"
is_toxic = False

These variables help in storing and analyzing patient-specific drug data.

🧠 Memory Tricks

• int → Whole numbers (Dose)
• float → Decimal values (Concentration)
• string → Text (Drug name)
• bool → True/False (Safety)

🧪 Practice Exercise

dose = 650
drug = "Ibuprofen"
conc = 1.8

print(dose, drug, conc)

📝 MCQs

1. Which data type is used for decimal values?
   a) int
   b) float
   c) string
   d) bool
   Answer: b


2. Which of the following is a valid variable?
   a) 1dose
   b) dose_1
   c) dose-1
   d) dose 1
   Answer: b


3. What will be the type of “500”?
   a) int
   b) float
   c) string
   d) bool
   Answer: c

❓ FAQs

Why are data types important?

They ensure correct operations and data handling in programs.

Can Python change data type automatically?

Yes, Python supports dynamic typing.

➡ Next Topic: Operators in Python →