该怎么在下面的代码里添加一个可以升序和降序的成绩排序功能呀
from search import search_by_id
stat_submenu = '''
5 统计 ---|--- 1 学生总分
|--- 2 单科总成绩、平均分
|--- 3 单科最高分
|--- 4 总成绩排序
|--- 0 返回
'''
def scores_sum(db, sid):
sum = 0
if search_by_id(db, sid) == {}:
print(' - %s does not exist.' % sid)
sum = -1
else:
for i in db:
if i['studentID'] == sid:
sum = i['score_1'] + i['score_2'] + i['score_3']
return sum
def object_sum(db, object_n):
avg = 0
sum = 0
total = len(db)
for i in db:
sum += float(i[object_n])
avg = sum / total
return sum, avg
def object_max(db, object_n):
max = 0
for i in db:
temp = float(i[object_n])
if temp > max:
max = temp
return max
def db_stat(db):
temp_db = db
while True:
print(stat_submenu)
option = input(' > Enter your option:')
if option == '0':
break
elif option == '1':
sid = input(' >> Student ID:')
sum = scores_sum(db, sid.strip())
if sum != -1:
print(' - Sum_Score of %s is %f' % (sid, sum))
continue
elif option == '2':
object_name = input(' > Object name:')
sum, avg = object_sum(db, object_name.strip())
print(' - Sum of the object %s is %f' % (object_name, sum))
print(' - Average of the object %s is %f' % (object_name, avg))
continue
elif option == '3':
object_name = input(' > Object name:')
max = object_max(db, object_name.strip())
print(' - The maximum of the object %s is %f' % (object_name, max))
continue
elif option == '4':
print(' - To be coded.')
continue
else:
print(' - Inputting WRONG!')
continue
if __name__ == '__main__':
db_stat([])
pass
from search import search_by_id
stat_submenu = '''
5 统计 ---|--- 1 学生总分
|--- 2 单科总成绩、平均分
|--- 3 单科最高分
|--- 4 总成绩排序
|--- 0 返回
'''
def scores_sum(db, sid):
sum = 0
if search_by_id(db, sid) == {}:
print(' - %s does not exist.' % sid)
sum = -1
else:
for i in db:
if i['studentID'] == sid:
sum = i['score_1'] + i['score_2'] + i['score_3']
return sum
def object_sum(db, object_n):
avg = 0
sum = 0
total = len(db)
for i in db:
sum += float(i[object_n])
avg = sum / total
return sum, avg
def object_max(db, object_n):
max = 0
for i in db:
temp = float(i[object_n])
if temp > max:
max = temp
return max
def sort_sum(db):
l = list()
d = dict()
for i in db:
d[i['studentID']] = i['score_1'] + i['score_2'] + i['score_3']
# 升序
l.append(sorted(d.items(), key=lambda s:s[1]))
# 降序
l.append(sorted(d.items(), key=lambda s:s[1], reverse=True))
return l
def db_stat(db):
temp_db = db
while True:
print(stat_submenu)
option = input(' > Enter your option:')
if option == '0':
break
elif option == '1':
sid = input(' >> Student ID:')
sum = scores_sum(db, sid.strip())
if sum != -1:
print(' - Sum_Score of %s is %f' % (sid, sum))
continue
elif option == '2':
object_name = input(' > Object name:')
sum, avg = object_sum(db, object_name.strip())
print(' - Sum of the object %s is %f' % (object_name, sum))
print(' - Average of the object %s is %f' % (object_name, avg))
continue
elif option == '3':
object_name = input(' > Object name:')
max = object_max(db, object_name.strip())
print(' - The maximum of the object %s is %f' % (object_name, max))
continue
elif option == '4':
print(sort_sum(db))
continue
else:
print(' - Inputting WRONG!')
continue
if __name__ == '__main__':
db_stat([])
pass
使用sort()或sorted()。
推荐使用sorted()，因为sorted()不会改变原内容。
如果要升序，括号内加上reverse = True
分析：
方法一：先按成绩冒泡排序，再按名字冒泡排序，再按年龄冒泡排序
方法二：以成绩为排序要点，在该冒泡排序内，如果成绩相等，等判断名字，如果连名字都相等，就判断年龄，按要求调换位置
代码：
代码一：
class student(): #创建学生类
def inputInfo(self,st):
lis=list(st)
self.name=lis[0]
self.age=int(lis[1])
self.grade=int(lis[2])
def getName(self):
return self.name
def getAge(self):
return self.age
def getGrade(self):
return self.grade
n=int(input()) #输入部分
students=[]
while n:
n-=1
st=student()
st.inputInfo(input().split())
students.append(st)
for j in range(len(students)-1): #根据成绩排序，忽略成绩相等的情况
for i in range(len(students)-1-j):
if students[i].getGrade()>students[i+1].getGrade():
students[i],students[i+1]=students[i+1],students[i]
for j in range(len(students)-1): #遍历找到成绩相等的情况，按姓名排序
for i in range(len(students)-1-j):
if students[i].getGrade()==students[i+1].getGrade():
if students[i].getName()>students[i+1].getName():
students[i],students[i+1]=students[i+1],students[i]
for j in range(len(students)-1): #遍历找到成绩名字都相等的情况，按年龄排序
for i in range(len(students)-1-j):
if students[i].getGrade()==students[i+1].getGrade():
if students[i].getName()==students[i+1].getName():
if students[i].getAge()>students[i+1].getAge():
students[i],students[i+1]=students[i+1],students[i]
for i in students: #输出
print(i.getName(),i.getAge(),i.getGrade(),sep=' ')
```python
#######################################
#代码二：
#######################################
class student(): #创建学生类
def inputInfo(self,st):
lis=list(st.split())
self.name=lis[0]
self.age=int(lis[1])
self.grade=int(lis[2])
def getName(self):
return self.name
def getAge(self):
return self.age
def getGrade(self):
return self.grade
students=[] #输入部分
n=int(input())
while n:
n-=1
st=student()
st.inputInfo(input())
students.append(st)
for i in range(len(students)-1):
for j in range(len(students)-1-i): #按成绩排序
if students[j].getGrade()>students[j+1].getGrade():
students[j],students[j+1]=students[j+1],students[j]
elif students[j].getGrade()==students[j+1].getGrade():#当过程中遇到成绩相等的时候，按名字排序
if students[j].getName()>students[j+1].getName():
students[j],students[j+1]=students[j+1],students[j]
elif students[j].getName()==students[j+1].getName():#当成绩名字相等，按年龄排序
if students[j].getAge()>students[j+1].getAge():
students[j],students[j+1]=students[j+1],students[j]
for i in students: #输出
print(i.getName(),i.getAge(),i.getGrade(),sep=' ')
from search import search_by_id
stat_submenu = '''
5 统计 ---|--- 1 学生总分
|--- 2 单科总成绩、平均分
|--- 3 单科最高分
|--- 4 总成绩排序
|--- 0 返回
'''
def scores_sum(db, sid):
sum = 0
if search_by_id(db, sid) == {}:
print(' - %s does not exist.' % sid)
sum = -1
else:
for i in db:
if i['studentID'] == sid:
sum = i['score_1'] + i['score_2'] + i['score_3']
return sum
def object_sum(db, object_n):
avg = 0
sum = 0
total = len(db)
for i in db:
sum += float(i[object_n])
avg = sum / total
return sum, avg
def object_max(db, object_n):
max = 0
for i in db:
temp = float(i[object_n])
if temp > max:
max = temp
return max
def object_sort(db):
sum_list = []
for i in db:
sum = i['score_1'] + i['score_2'] + i['score_3']
sum_list.append(sum)
return sorted(sum_list)
def db_stat(db):
temp_db = db
while True:
print(stat_submenu)
option = input(' > Enter your option:')
if option == '0':
break
elif option == '1':
sid = input(' >> Student ID:')
sum = scores_sum(db, sid.strip())
if sum != -1:
print(' - Sum_Score of %s is %f' % (sid, sum))
continue
elif option == '2':
object_name = input(' > Object name:')
sum, avg = object_sum(db, object_name.strip())
print(' - Sum of the object %s is %f' % (object_name, sum))
print(' - Average of the object %s is %f' % (object_name, avg))
continue
elif option == '3':
object_name = input(' > Object name:')
max = object_max(db, object_name.strip())
print(' - The maximum of the object %s is %f' % (object_name, max))
continue
elif option == '4':
object_name = input(' > Object name:')
sort = object_sort(db)
print(' - The sort object %s is %s' % (object_name, str(sort)))
continue
else:
print(' - Inputting WRONG!')
continue
if __name__ == '__main__':
db_stat([])
pass