<p>这是一个更新的GradeHandler类演示。我试图考虑更新成绩、删除科目等:</p>
<pre><code>__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()
</code></pre>