@hoola: Die Aufgabenstellung sagt das man die Satzzeichen *nicht* beachten muss. Schau Dir einfach mal das Beispiel in der Aufgabe an — da sind die Satzzeichen auch einfach raus gefallen.
Code: Alles auswählen
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from collections import defaultdict
from datetime import date as Date
from itertools import chain
#
# 1 a)
#
# Commenting that code would be stating the obvious, i.e. repeating what the
# code does in the comment. That is not what comments are meant for. So I pass
# on this one. :-þ
#
#
# 1 b)
#
def get_unique_characters(string):
"""
>>> get_unique_characters('')
''
>>> get_unique_characters('baabcad')
'abcd'
>>> get_unique_characters('mississippi')
'imps'
>>> get_unique_characters('python')
'hnopty'
"""
return ''.join(sorted(set(string)))
#
# 2 a)
#
def make_histogram(sexes, allowed_sexes=('w', 'm')):
"""
>>> sexes = list('wwmwmwmmswwwwmm')
>>> sexes
['w', 'w', 'm', 'w', 'm', 'w', 'm', 'm', 's', 'w', 'w', 'w', 'w', 'm', 'm']
>>> female_count, male_count, error_count = make_histogram(sexes)
>>> female_count, male_count, error_count
(8, 6, 1)
>>> sexes
['w', 'w', 'm', 'w', 'm', 'w', 'm', 'm', None, 'w', 'w', 'w', 'w', 'm', 'm']
>>> male_count == sexes.count('m')
True
>>> female_count == sexes.count('w')
True
>>> error_count == sexes.count(None)
True
"""
histogram = defaultdict(int)
for i, sex in enumerate(sexes):
sex = sexes[i] = sex if sex in allowed_sexes else None
histogram[sex] += 1
return tuple(histogram[k] for k in chain(allowed_sexes, [None]))
#
# 2 b)
#
# The input functions should be separate.
#
def input_non_empty(prompt):
"""Repeats the `prompt` until the user inputs a non empty string."""
while True:
result = raw_input(prompt + ': ')
if result:
return result
def input_choice(prompt, choices):
"""Repeats the `prompt` until the user inputs one of the given `choices`.
Input is case insensitive and returned as lower case and `choices` are
displayed in lower case too.
"""
choices = [c.lower() for c in choices]
while True:
result = raw_input('%s (%s): ' % (prompt, '/'.join(choices))).lower()
if result in choices:
return result
#
# It should be possible to leave the name field empty and to input at least
# an unknown sex for a newborn because both cases may happen in the field.
#
def input_child():
return (
input_non_empty('Bitte Nachnamen eingeben'),
raw_input('Bitte Vornamen eingeben'),
input_choice('Bitte Geschlecht eingeben', ['m', 'w', '?'])
)
def new_child(children):
children.append(input_child())
return children # XXX Stupid API.
#
# 3
#
def shorten_words(text, length=5):
return ' '.join(w[:length] for w in text.split())
def test_shorten_words():
source = (
u'Die ersten Buchstaben eines Wortes sind die Träger der Bedeutung.'
u' Die Verständlichkeit eines Satzes ist auch gegeben, wenn von jedem'
u' Wort die ersten fünf Buchstaben geschrieben werden.'
)
expected = (
u'Die erste Buchs eines Worte sind die Träge der Bedeu Die Verst eines'
u' Satze ist auch gegeb wenn von jedem Wort die erste fünf Buchs gesch'
u' werde'
)
assert shorten_words(source) == expected
#
# 4 a)
#
# Maps unique ISBN to rest of data. This makes it easy to ensure there is
# just one entry per ISBN.
# ISBN is a string because it is semantically no number. You do not calculate
# with ISBN like adding them up or dividing them by another number.
# For calculating the checksum it is easier to work with the single digits when
# the ISBN is in string form.
#
# The other choices for types should be obvious.
#
# In a serious application a Books container class and a Book class for
# single entries might be more appropriate than accessing „fields” by index.
#
PRICE_INDEX = 3
COUNT_INDEX = 4
ISBN_TO_BOOK = {
'9783768825825': [
'Delius Klasing', 'MV - Bornholm', Date(2009, 1, 1), 54.90, 2
],
'9783768832021': [
'Delius Klasing', 'MV - Bornholm', Date(2011, 3, 1), 54.90, 13
],
'9783892255598': [
'Edition Maritim', 'Rund Rügen', Date(2008, 3, 1), 29.90, 15
],
'9783892252368': [
'Delius Klasing', 'Küstenhandbuch MV', Date(2006, 3, 1), 29.90, 3
],
'9783980672016': [
'Quick Maritim Medien',
'Törnplaner/-atlas Peene, Oder, Bodden',
Date(2006, 4, 1),
25.00,
5
],
'9783768831017': [
'Delius Klasing',
'Kieler Bucht und Rund Fünen (2010)',
Date(2010, 3, 1),
69.90,
17
],
}
def sum_total_worth(isbn2book):
"""
>>> sum_total_worth(ISBN_TO_BOOK)
2675.0
"""
return sum(b[PRICE_INDEX] * b[COUNT_INDEX] for b in isbn2book.itervalues())
Das Hirn muss trotzdem einmal drüber schlafen um es ordentlich abzuspeichern. 
