在Python中创建主题和评分系统
在Python中创建主题和评分系统
提问于 2019-03-09 20:08:39
我正在尝试为一个UNI项目创建一个评分系统。我们被告知要有3个全局列表：
Emner = ["INFO100","INFO104","INFO110","INFO150","INFO125"]
FagKoder = [["Informasjonsvitenskap","INF"],["Kognitiv vitenskap","KVT"]
Karakterer=[["INFO100","C"],["INFO104","B"],["INFO110","E"]]有了这些列表，我们可以创建一种查看科目(Emner)的方法，可以查看Karakterer的等级，但我们也应该能够查看没有等级的科目。应该是这样显示的：
我们还应该能够在(Emner)中添加新科目，在(Karakterer)中添加新成绩。所有这些都应该如上图所示。
我一直在尝试各种不同的方法，但我总是回到两个问题中的一个。如果我不能打印一个没有等级的主题，或者如果我添加了一个新的主题(Emne)，并且想要添加一个等级(Karakter)，我就无法将它放到正确的主题中，因为它只是保存在第一个没有等级的主题上。
希望任何人都能帮助我，在这里发疯！
到目前为止，我有以下代码：
def emneliste():
global Emner
global Karakterer
emne,kar = zip(*Karakterer)
ans = [list(filter(None, i)) for i in itertools.zip_longest(Emner,kar)]
def LeggTilEmne():
global Karakterer
global Emner
nyttEmne = input("Skriv ny emnekode (4Bokstaver + 3 tall): ")
if nyttEmne not in Emner:
while re.match('^[A-Å]{3,4}[0-9]{3}$',nyttEmne):
Emner.append(nyttEmne)
print(nyttEmne + " Er lagt til!")
start()
print("Feil format")
LeggTilEmne()
else:
print("Dette Emnet er allerede i listen din")
start()
def SettKarakter():
global Karakterer
global Emner
VelgEmne = input("Hvilke emne? ")
Emne,Karakter = zip(*Karakterer)
if str(VelgEmne) not in str(Emner):
print("Dette faget er ikke i din liste")
feil = input("om du heller ønsket å opprette fag trykk 2, ellers trykk enter ")
if feil == str(2):
LeggTilEmne()
else:
start()
else:
if str(VelgEmne) in str(Karakterer):
index = Karakterer.index([VelgEmne,"C"])
Karakterer.pop(index)
SettKar = input("Karakter? ")
Emner.append([VelgEmne,SettKar])
print("Karakter " + SettKar + " Er Lagt til i " + VelgEmne)
start()
else:
SettKar = input("Karakter? ")
if str(VelgEmne) in str(Emner):
index = Emner.index(VelgEmne)
print(index)
Emner.pop(index)
Emner.insert(index,[VelgEmne,SettKar])
print("Karakter " + SettKar + " Er Lagt til i " + VelgEmne)
start()
else:
print("Virker Ikke")
start()回答 2
Stack Overflow用户
回答已采纳
发布于 2019-03-09 20:28:16
您可以将Karakterer设为字典，以便可以在Emner中迭代主题，并使用in运算符高效地查找主题是否在Karakterer中：
Karakterer = dict(Karakterer)
for subject in Emner:
print(*([subject] + ([Karakterer[subject]] if subject in Karakterer else [])))这将输出以下内容：
INFO100 C
INFO104 B
INFO110 E
INFO150
INFO125Stack Overflow用户
发布于 2019-03-09 20:41:03
这是一个更新的GradeHandler类演示。我尝试允许更新成绩、删除科目等：
__name__ = 'DEMO'
class GradeHandler(object):
EMNER = ["INFO100","INFO104","INFO110","INFO150","INFO125"]
FAGKODER= [["Informasjonsvitenskap","INF"],["Kognitiv vitenskap","KVT"]]
KARAKTERER = [["INFO100","C"],["INFO104","B"],["INFO110","E"]]
def __init__(self):
self.Emner = self.EMNER
self.FagKoder = self.FAGKODER
self.Karakterer = self.KARAKTERER
self.__create_grade_dict()
def remove_subject(self, subject_name):
"""
Remove a subject ot the classes class list variable.
"""
try:
self.Emner = [i for i in self.EMNER if i != subject_name]
self.__create_grade_dict()
except ValueError:
pass
def add_subject(self, subject_name):
"""
Append a subject ot the classes class list variable.
"""
if not subject_name in Emner:
self.Emner.append(subject_name)
self.__create_grade_dict()
def __create_grade_dict(self, grade_dict=None):
"""
Split grades matrix into separate parts; Create and set a dictionary of values.
"""
if grade_dict is None:
self.grade_dict = dict()
sub, grade = zip(*self.Karakterer)
karakterer_dict = {k:v for k, v in list(zip(sub, grade))}
for i in self.Emner:
if i in karakterer_dict.keys():
self.grade_dict[i] = karakterer_dict[i]
else:
self.grade_dict[i] = ''
def update_grade(self, subject_name, grade='A'):
"""
Update a grade in the grade dictionary.
Will also add a subject if not alrady in the dictionary.
"""
try:
self.grade_dict[subject_name] = grade
except (KeyError, ValueError):
pass
def print_grades(self, subject_name=None):
"""
Print dictionary results.
"""
if subject_name is None:
for k, v in self.grade_dict.items():
print('{} {}'.format(k, v))
else:
if subject_name in self.grade_dict.keys():
print('{} {}'.format(subject_name, self.grade_dict[subject_name]))
if __name__ == 'DEMO':
### Create an instance of the GradeHandler and print initial grades.
gh = GradeHandler()
gh.print_grades()
### Append a class
gh.add_subject('GE0124')
gh.print_grades()
### Add grade
gh.update_grade('GE0124', 'B+')
gh.print_grades()
### Update grades
gh.update_grade('GE0124', 'A-')
gh.print_grades()
### Remove subject (will also remove grade.
gh.remove_subject('GE0124')
gh.print_grades()页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/55077190
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