multiplying a string

what does the following code do?

"hello " * 3

can you use this idea to print a triangle of "*" using just a single for loop?

controlling precision with str.format()

can you print the value 10/3, with only 2 digits of precision?

• hint: use the .format() function

CSV

here is some data in CSV (Comma Seperated Values) format:

   name, age, country
   avi cohen, 30, israel
   ben hur, 25, united kingdom
   can davidovich, 40, georgia
   david ben shalem, 60, united states of america
   efrat ben dagan levi, 25, united arab emirates

1. print only the names of the people in this data, and nothing else
   • note: don’t print commas ','
   • hint: use splitlines() and split()

2. print only the ages

3. print only country names

4. print only the last 3 lines (hint: use splicing)

5. print the data without the header (hint: use splicing)

6. print every second line, without the header (hint: use splicing)

7. print a smaller csv that has just ages and countries, without the header and without names

printing receipts

lets print a simple receipt using the .format() function the receipt will have 4 lines, looking like this:

    cost           :  362.50 NIS
    vat            :   17.00 %
    vat            :   61.62 NIS
    total          :  424.12 NIS

to determine the cost and the vat, lets use random numbers. use the following code:

import random
cost_nis = round(random.normalvariate(200, 50), 2)
vat_percent = random.randint(160, 180) / 10
# print(cost_nis, vat_percent)

compute the vat in NIS and the total and print the receipt

• NOTE: make sure that the numbers in the receipt are nicely aligned to make it readble!
• HINT: use the str.format() function, read the specification or go through some examples to get the hang of this mini-langauge

** a full receipt

given a menu with prices that can look like this:

     prices = {
         "steak" : 150,
         "omelet" : 25,
         "coca cola" : 12,
         "orange juice" : 16,
         "pizza" : 49,
         "hamburger" : 59,
         "pita" : 1.5,
         "tomato salad" : 13.5
     }

and an a list containing an order from a table, such as:

order = ["steak", "steak", "pita", "pizza", "coca cola"]

use a for loop to print a full receipt

steak          :  150.00 NIS
steak          :  150.00 NIS
pita           :    1.50 NIS
pizza          :   49.00 NIS
coca cola      :   12.00 NIS
----------------------------
cost           :  362.50 NIS
vat            :   17.00 %
vat            :   61.62 NIS
total          :  424.12 NIS

### useful: data
prices = {
         "steak" : 150,
         "omelet" : 25,
         "coca cola" : 12,
         "orange juice" : 16,
         "pizza" : 49,
         "hamburger" : 59,
         "pita" : 1.5,
         "tomato salad" : 13.5
     }

order = ["steak", "steak", "pita", "pizza", "coca cola"]