input() function – get input from the user in Python

In this article, we would discuss input() function in Python v3.9. input() function, a built-in Python function, helps us get input from the user.

By default, input() function reads the input as string unless otherwise instructed. Here, we would discuss how a user can input integer, float and string values with the help of input() function.

input() function – get string input

If we want to obtain a string input from the user. Then,

#Program to get string input from the user

x=input("Enter your Name: ")
print(x)

We have asked the user to input his/her name with a prompt and have stored the input in variable x. Then, we print the name using print() function.

Output –

Enter your Name: XYz
XYz

We would like to add more, a user can also provide numerical input to the above code. And, that would work perfect. The input() function would read the numerical input as a string. And, we won’t be able to perform any arithmetic operation on it. We illustrate it with following code –

#Concatenation

x=input("Enter your first name: ")
y=input("Enter your surname: ")
print(x+y)

We have deliberately put in numerical input i.e. first name — 34 and surname — 65.

Output –

Enter your first name: 34
Enter your surname: 65
3465

The output is self-explanatory. It just reads + as concatenation operator and joins both the strings.

For arithmetic operations we would have do more along with input() function.

input() function – get integer input

To ask a user for integer input, typecast the variable using int() function. For instance –

#Program to get integer input from the user

x=int(input("Enter first number: "))
y=int(input("Enter second number: "))
print(x+y)

Output –

Enter first number: 34
Enter second number: 65
99

Herein, concatenation didn’t happen. The interpreter already knows that we would be storing integer input in our variables x and y. So, it did an arithmetic operation on it.

input() function – get float input

Similarly, for a float input – typecast the variable using float() function. For instance –

#Program to get float input from the user

x=float(input("Enter first number: "))
y=float(input("Enter second number: "))
print(x+y)

Output –

Enter first number: 34.45
Enter second number: 65
99.45

It is worth mentioning here that, a user can provide integer input on a float() function. But, float input while using int() function doesn’t work.

In conclusion, here we discussed how to get string, integer and float input from the user using input() function in Python.