Lists 5 - First challenges

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We now propose some exercises without solution, do you accept the challenge?

Challenge - super DUPER sorted

  1. Given a string s as a series of exactly 3 words separated by various blanks, write some code which sorts each word separately and puts in s a string with all the words joined and sorted.

Example - given:

s = ''super \t \n   DUPER  \n   sorted''

after your code, it should result:

>>> s
'eprsuDEPRUdeorst'

  • DO NOT use if statements nor cycles

  • DO NOT write string constants in your code (so no '\t' …)

[1]:


s = 'super \t \n   DUPER  \n   sorted'  # 'eprsuDEPRUdeorst'
#s = 'cba BCAD  dcab'                   # 'abcABCDabcd'

# write here

Challenge - What a nasty problem

Suppose you have a list of strings to_mod with an asterisk '*', which you want to MODIFY by inserting another list to_ins at asterisk position.

Example - given:

to_ins = ['I','mean','truly','darn']
to_mod = ['What','a','nasty','*','nasty','problem']

After your code, it must result:

>>> to_mod
['What', 'a', 'nasty', 'I', 'mean', 'truly', 'darn', 'nasty', 'problem']

  • DO NOT change the assignment of to_mod, so no to_mod = statement is allowed !!! If you are thinking about converting everything to a string and back to a list, even if not optimal it could still be a solution provided you don’t use a to_mod = statement

  • DO NOT use loops nor if statements

  • HINT: think about methods that MODIFY a list, for example you could either:

  1. reset the list with the clear() method and re-extend it with what you need (of course you will need to save prior resetting …)

  2. (harder) use slices ressignment

[2]:


to_ins = ['I','mean','truly','darn']
to_mod = ['What','a','nasty','*','nasty','problem']
#to_ins, to_mod = ['looks', 'like', 'a'],  ['This','*','punishment']


# write here

Challenge - Toys in the Attic

There are Toys in the Attic! Let’s take them back!

Unfortunately, they are mixed with other stuff so we need to reorganize the mess. The attic is very tiny and dark, so you put your stuff in a long row. At the beginning of the attic there is a little note you put with the last inventory you did. It reports the number of items of a particular category that you will find after the note. After all those objects, you will find another note with the number of objects for another category of objects which follows and so on.

We can represent the attic as a list of mixed object types, numbers and strings. The list contains exactly three categories, in this order: toys, painting, and sports. You are given three separate empty lists toys, painting, sports and your goal is to separate the objects into these 3 different lists

After your code, you should obtain:

toys:     ['doll', 'lego', 'minicar']
painting: ['frame', 'brushes']
sports:   ['bike', 'pump', 'racket', 'ball']

  • DO NOT replace the lists, so no toys = statements ! You can only MODIFY them.

  • DO NOT use loops nor if statements

[4]:



     # 0   1      2       3      4    5        6      7    8     9       10      11
attic=[3,'doll','lego','minicar',2,'frame','brushes', 4,'bike','pump','racket','ball']

#         0    1        2      3    4     5      6        7
#attic = [2,'cards','monopoly',1,'colors',2,'snowboard','ski']

# these are given, you have to somehow MODIFY these lists
toys = []
painting = []
sports = []

# write here


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