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Exercise 2

Problem 1

You inspected the url printed by your code as an exercise for Unit1 and also saved it to a CSV file. Now since you have learnt to write procedures, make decisions, and also know how to iterate, do the following:

  • Write a procedure inspect_url that takes as input all the urls you found (of course, one at a time) and associate a category with it (absolute or relative).
  • In case of absolute, it separates the protocols, name, and domain (as done during previous exercise).
  • Saves each of the url alongwith the category, protcols, name, and domain in separate fields of CSV file. Your CSV file should contain a proper header for all fields. In case of a relative url, you should fill in the required fields from parent url. You should define a procedure save_url for this purpose.

Note

Ignore any other possibilities that come along. You are free to make your assumptions where neeeded!

Problem 2

Define a procedure squarify that takes as input a string and outputs a string with uppercase 'S' followed by the input string. For example: 

squarify('lant') # -> Slant

Problem 3

Define a procedure median that takes as input three numbers and outputs the median of three numbers. For example:

median(1,2,3) # -> 2
median(9,3,6) # -> 6
median(7,8,7) # -> 7

Problem 4

You are given 3 loops below. For each of the loop you need to identify if it:
a. always finishes
b. sometimes runs forever
c. unkonow (to anyone)

Loop1:

n = <any positive number>
i = 0
while i <= n:
  i = i + 1

Loop2:

n = <any positive number>
i = 0
while i <= n:
  i = i * 1
  n = n + 1
  if i > n:
    break

Loop3:

n = <any positive number>
while n != 1:
  if n % 2 == 0:
    n = n/2
  else:
    n = 3*n + 1

Problem 5

Define a procedure find_last that takes as input two strings, a search string and a target string, and outputs the last position in the search string where the target string appears, or -1 if there arte no accurences.

Problem 6

Define a procedure print_multiplication_table that takes as input a whole number, and prints a multiplication table showing all the whole multiplications upto an including the input number in exacting the format given in the example below:

print_multiplication_table(2)
# 1 * 1 = 1
# 1 * 2 = 2
# 2 * 1 = 2
# 2 * 2 = 4

Best!

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