Incrementing and Decrementing

Look at the table to understand how to minimize the writing of mathematical operators!

Formula	How to minimize
`a = a + 1`	`a += 1`
`a = a - 1`	`a -= 1`
`a = a * 2`	`a *= 2`
`a = a / 2`	`a /= 2`

Consider list of prices named prices. If price is greater than 30, then the 25% discount must be set. If not, then price must be reduced by 3. Check out how can we do it with the for loop.


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prices = [20.35, 30.5, 12.65, 8.5, 6.5, 5.8, 40.5]
print(prices)
prices_upd = []

# Set the for loop
for price in prices:
  # Condition: the element of the list is greater than 30
  if price > 30:
    # Set the 25% discount
    price *= 0.75
  else:
    # Decrease the price by 3
    price -= 3
  # Appending values to the upd list
  prices_upd.append(price)

# Print the prices_upd
print(prices_upd)

Everything was clear?

Thanks for your feedback!

Section 3. Chapter 8