从 Python 中的文本文件中选择和排序整数/字符串

Question

我有以下文本文件 (Results.txt)，当前设置如下：

Sophie
3
6
9
Laura
8
5
15
Alan
10
4
6

我正在尝试以不同的方式选择和排序这些数据。到目前为止，我的代码如下所示：

file = open('Results.txt', 'r')
lines = file.read().splitlines()
a = int(lines[1])
b = int(lines[2])
c = int(lines[3])
d = int(lines[5])
e = int(lines[6])
f = int(lines[7])
g = int(lines[9])
h = int(lines[10])
i = int(lines[11])
name1=lines[0]
name2=lines[4]
name3=lines[8]
allnames=[name1, name2, name3]
allnames.sort()
student1 = [a,b,c]
student2 = [d,e,f]
student3 = [g,h,i]
s1high=max(student1)
s2high=max(student2)
s3high=max(student3)

file.close()

我希望我的程序能够：

• 按字母顺序对测试结果进行排序，并显示学生的最高分。
• 按平均分从高到低排序。
• 按最高分从高到低排序。

...并将其输出到屏幕

如您所见，我已经开始从文本文件中导入结果并将其转换为整数，但肯定有一些更快的方法可以做到这一点？

Answer 1

看看这是不是你想要的

要从文件中读取内容，您可以使用

s = {lines[i]:[float(k) for k in lines[i+1:i+4]] for i in range(0,len(lines),4)}

这给出了一个学生字典和类似这样的标记

s = {'Laura': [8, 5, 15], 'Sophie': [3, 6, 9], 'Alan': [10, 4, 6]}

您可以使用按字母排序

for i in sorted(s.keys()):
    print i,max(s[i])

类似地根据平均排序

# function which returns avg mark given the name  
avg_mark = lambda name:sum(s[name])/len(s[name])
for i in sorted(s.keys(),key=avg_mark,reverse=True):
    print i,avg_mark(i)

类似地根据最高分进行排序

# function which returns highest mark given the name
high_mark = lambda name:max(s[name])  
for i in sorted(s.keys(),key=high_mark,reverse=True):
    print i,high_mark(i)

希望这会对您有所帮助。如果您需要任何解释，请随时发表评论

Answer 2

我不知道您所说的“...并显示学生最高分 按平均分排序，从最高到最低 按最高分排序，从最高到最低...”

也许这个小代码会让你开始你想做的事情。

file = open('Results.txt', 'r')
lines = file.read().splitlines()
my_dict = {}
key = None

# creating a dict with your data
for line in lines:
    if line.isalpha():
        key = line
        my_dict[key] = []
    else:
        my_dict[key].append(int(line))

# printing your data 
# iterating on sorted by key dict
for student in sorted(my_dict):
    print(student)
    # iterating the sorted list
    for score in sorted(my_dict[student], reverse=True):
        print(score)

Answer 3

也许是这样的？在 CPython 2.[67]、CPython 3.[01234]、Pypy 2.4.0、Pypy3 2.3.1 和 Jython 2.7b3 上运行：

#!/usr/local/cpython-3.4/bin/python

# pylint: disable=superfluous-parens
# superfluous-parens: Parentheses are good for clarity and portability

'''Get student grades'''

# port pprint
import decimal
import collections


def main():
    '''Main function'''
    students = collections.defaultdict(list)
    with open('input', 'r') as file_:
        for line in file_:
            line_sans_newline = line.rstrip('\n')
            if line_sans_newline.isalpha():
                name = line_sans_newline
            else:
                students[name].append(decimal.Decimal(line))
    names = list(students)
    names.sort()
    for name in names:
        max_grade = max(students[name])
        print('{0} {1}'.format(name, max_grade))

main()

HTH

Answer 4

val=[]
keys=[]
i=0
l=[]
lines=open('Result.txt','r').readlines()
for line in lines:
  try:
    val.append(int(line))
  except:
    keys.append(line)

for i in range(0,len(val),3):
 h=val[i:i+3]
 h.sort()
 l.append(h[::-1])
print 'Sort the test results alphabetically and show the students highest score.\n'
for i,j in zip(keys,l):
    print i,j

print 'Sort by the average score, highest to lowest.'
avlist=[float(sum(i))/len(i) for i in l ]
print avlist
while(len(avlist)):
    for i,j in zip(keys,avlist):
        if j==max(avlist):
          print i,j
          avlist.remove(j)

print '\nSort by the highest score, highest to lowest.\n'
hlist=[max(i) for i in l ]
hlist.sort()
hlist=hlist[::-1]
for k in hlist:
    for i,j in zip(keys,l):
        if max(j)==k:
            print i,j

结果：

Sort the test results alphabetically and show the students highest score.

Sophie
[9, 6, 3]
Laura
[15, 8, 5]
Alan
[10, 6, 4]

Sort by the average score, highest to lowest.

[6.0, 9.333333333333334, 6.666666666666667]
Laura
9.33333333333
Alan
6.66666666667
Sophie
6.0

Sort by the highest score, highest to lowest.

Laura
[15,8,5]
Alan
[10,6,4]
Sophie
[9,6,3]