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Python

Numeric expressions

Arithmetic operators combine numbers into expressions, such as a total price.

Maya's receipt shows three items at $4 each and one $2 fee. She wants Python to work out the whole charge in a single line. How can one calculation get it right?

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5 minutes. No sign-up needed.

What you'll learn5 ideas
  • A numeric expression is a calculation written with numbers, like 3 * 4, which Python turns into 12.
  • Python multiplies with *, subtracts with - and divides with /, and / always gives a decimal answer like 4.5 or 4.0.
  • Python's order of operations does multiplying and dividing before adding and subtracting, so 5 + 2 * 6 gives 17.
  • When dividing and multiplying sit side by side, Python works from left to right, so 18 / 3 * 2 gives 12.0.
  • Python works out what's inside parentheses first, so (5 + 2) * 6 gives 42.
Chapter 2: Values and variables7 lessons · 26 min
  1. 1Python values3 min
  2. 2Numeric expressions5 min
  3. 3String concatenation3 min
  4. 4Variable assignment3 min
  5. 5Variable reassignment3 min
  6. 6Python types and type errors3 min
  7. 7Challenge: Values and variables6 min
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This lesson is part of the Python course.

Example plan3 lessons · 11 min

Python values3 min
Numeric expressionsValues and variables5 min
String concatenationValues and variables3 min

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