Taking Input and Type Conversion
40 min read
Getting Started with Python
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Taking Input and Type Conversion
input() waits for the user to type a line and returns it as a string, always. Even if the user types 25, you get the text "25". Adding two such strings joins them: "25" + "5" is "255".
To do arithmetic, convert the text with int() or float(). This is called type conversion (or type casting). str() converts a number back to text.
a = int(input("First number: "))
b = int(input("Second number: "))
print("Sum:", a + b)
price = float(input()) # 99.5 stays a decimal numberTo read several values typed on one line, split the line into words first: x, y = input().split(), then convert each one. map(int, input().split()) converts all of them in one go.
Python exercise
Read two whole numbers, each on its own line, and print their sum as a number (not the two strings joined together).
a = input()
b = input()
print(a + b) # this joins the text: convert a and b firstLog in to edit and run this code.
