Solutions for the mandatory assignments on sets and dicts

1. Model an organisation of employees, management and board of directors in 3 sets.

bd = {'Benny', 'Hans', 'Tine', 'Mille', 'Torben', 'Troels', 'Søren'}
ma = {'Tine', 'Trunte', 'Rane'}
em = {'Niels', 'Anna', 'Tine', 'Ole', 'Trunte', 'Bent', 'Rane', 'Allan', 'Stine', 'Claus', 'James', 'Lars'}

1. who in the board of directors is not an employee?

# difference
bd - em

{'Benny', 'Hans', 'Mille', 'Søren', 'Torben', 'Troels'}

2. who in the board of directors is also an employee?

# Intersection
bd & em

{'Tine'}

3. how many of the management is also member of the board?

# intersection
len(ma & bd)

1

4. (is) All members of the managent also an employee

# subset
ma <= em

True

5. (is) All members of the management also in the board?

# subset
ma <= bd

False

6. Who is an employee, member of the management, and a member of the board?

#  Intersection
em & ma & bd

{'Tine'}

7. Who of the employee is neither a memeber or the board or management?

em - bd - ma

{'Allan', 'Anna', 'Bent', 'Claus', 'James', 'Lars', 'Niels', 'Ole', 'Stine'}

read about sets here: https://realpython.com/python-sets/

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2. Using a list comprehension create a list of tuples from the folowing datastructure

alphabet = {'a': 'Alpha', 'b' : 'Beta', 'g': 'Gamma'}

[(key,value) for key, value in alphabet.items()]

[('a', 'Alpha'), ('b', 'Beta'), ('g', 'Gamma')]

or done through a loop:

t = []
for key, value in alphabet.items():
    t.append((key, value))
t

[('a', 'Alpha'), ('b', 'Beta'), ('g', 'Gamma')]

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3. From these 2 sets:

s1 = {'a', 'e', 'i', 'o', 'u', 'y'}
s2 = {'a', 'e', 'i', 'o', 'u', 'y', 'æ' ,'ø', 'å'}

Of the 2 sets create a:

Union

s1 | s2

{'a', 'e', 'i', 'o', 'u', 'y', 'å', 'æ', 'ø'}

Symmetric Difference

s1 ^ s2

{'å', 'æ', 'ø'}

Difference

s1 - s2

set()

s2 - s1

{'å', 'æ', 'ø'}

Disjoint

s1 & s2

{'a', 'e', 'i', 'o', 'u', 'y'}

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4. Date Decoder.

A date of the form 8-MAR-85 includes the name of the month, which must be translated to a number.

Create a dict suitable for decoding month names to numbers.

Create a function which uses string operations to split the date into 3 items using the “-” character.

Translate the month, correct the year to include all of the digits.

The function will accept a date in the “dd-MMM-yy” format and respond with a tuple of ( y , m , d ).

month_dict = {'JAN' : 1, 'FEB':2, 'MAR':3,'APR':4, 'MAY':5,'JUN':6, 'JUL':7,'AUG':8, 'SEP':9,'OCT':10,'NOV':11,'DEC':12}

def manipulate_date(x):
    x = x.split('-')
    return (x[0], month_dict[x[1]], x[2])

manipulate_date('12-APR-90')

('12', 4, '90')