02-variables.md

print() Function and Variables

Video Link: https://www.youtube.com/watch?v=i83VkP0LHPI

In this video, we learned about the print() function and variables in Python.

Programs in the Video

• Program to Print Strings
• Program to Print Numbers
• Store Data in a Variable
• Assign one Variable to Another
• Print Multiple Objects in One print()

---

print() Function

The print() is a built-in function in Python. It prints whatever object that is inside the parentheses ().

Program to Print Strings

A string is a textual data. They must be wrapped inside quotation marks.

# Printing Strings

print('Hello World')
print("Python 3 is awesome")

Output

Hello World
Python 3 is awesome

---

Program to Print Numbers

The print() function can also be used to print numbers. There are two commonly used numeric data in Python:

• integers: 5, -34, 0 etc.
• floating-point numbers: 5.0, -45.2, 3.5 etc.

# Printing numbers

print(5)
print(34.5)

Output

5
34.5

---

Variables in Python

We use variables to store data and use them later in the program.

Store Data in a Variable

We use the = operator to assign a value to a variable.

# store data in variables and print them

city = "Kathmandu"
print(city)

Output

Kathmandu

---

Change Value Stored in a Variable

We can also change the data a variable holds.

# change value of a variable

city = "Kathmandu"
print(city)

city = "New York"
print(city)

Output

Kathmandu
New York

---

Assign one Variable to Another

# assign one variable to another

city = "Kathmandu"
destination_city = "New York"

city = destination_city
print(city)

Output

New York

# assign one variable to another

my_favorite_number = 5
print(my_favorite_number)

pi = 3.14
print(pi)

my_favorite_number = pi

print(my_favorite_number)
print(pi)

Output

5
3.14
3.14

---

Print Multiple Objects in One print()

We can print multiple objects in a single print() function by separating them with commas.

# print two objects in one print()

city = "Kathmandu"
print("City:", city)

Output

City: Kathmandu

When we print more than one object in a single print() function, they are by default separated by commas.

# print four objects in one print()

city = "Kathmandu"
kfc_locations = 3
print("City:", city, "KFC Locations:", kfc_locations)

Output

City: Kathmandu KFC Locations: 3

---

Giving Good Variable Names

We should always try to give descriptive and meaningful variable names so that it's easier to understand our code.