Description

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Beginner · 10 min

Converting numbers

Convert numeric text before doing arithmetic.

Turn numeric text into a number

int() converts whole-number text into an integer. Without conversion, adding two strings joins their text instead of adding numbers.

text = "12"
print(text + "3")
print(int(text) + 3)

Output

123
15

Use decimal numbers

float() converts numeric text with a decimal point. / performs division and produces a floating-point result. Invalid numeric text cannot be converted this way.

price = float("2.5")
print(price * 2)
print(9 / 2)

Output

5.0
4.5

Converting numbers

  1. Identify which values are strings and which are numbers.
  2. Convert numeric text before calculating with it.

Try it yourself

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Add a delivery fee

Convert amount_text to an integer. Add a delivery fee of 2, save the result in total, and display it.

Practice