Python 3.x 如何将字典添加到prettytable

我有两个文件，学生和成绩必须阅读并转换成字典，最后打印到prettytable：

等级：

10103   SSW 567 A   98765
10103   SSW 564 A-  98764
10103   CS 501  B   98764
10115   SSW 567 A   98765
10115   SSW 564 B+  98764

学生：

10103   Baldwin, C  SFEN
10115   Wyatt, X    SFEN

下面是执行此操作的代码：

from collections import  defaultdict
from prettytable import PrettyTable
import os


class University:

    def __init__(self,path):
        self.students=dict()
        self.instructors=dict()             
        self.grades=defaultdict(list)
        

    def gg(self):
        for filename in os.listdir(self.path):
            with open(os.path.join(self.path, filename), 'r') as f:
                if filename=="students.txt":
                    for line in f:
                        
                        a,b,c = line.split("\t")
                        self.students[a] = {
                                "name": b, "major": c}
                
                elif filename=="grades.txt":
                    for line in f:
                        
                        d,e,f,g = line.split("\t")
                        self.grades[d].append({
                                "course": e, "grade": f,"instructor":g})
                        
                        
        pt: PrettyTable = PrettyTable(
            field_names=[
                'CWID',
                'Name',
                'cc',])    
        for i,j in self.students.items():
            for x,y in self.grades.items():
                if i==x:
                    pt.add_row([i,j["name"],y["course"]])

                
        return pt

a = University("C://Users/Swayam/Documents/Downloads")
c = a.gg()
print(c)

输出应为：

10103 Baldwin,C SSW567,SSW564,CS501
10115 Wyatt, X  SSW 567,SSW564

当我运行上述代码时，我得到以下错误：

TypeError: list indices must be integers or slices, not str

---

我不应该使用add_row行中的变量，我知道这一点，但是我可以用什么来替换它以获得输出。

您的代码的问题是

y

是一个列表：

for i,j in self.students.items():
    for x,y in self.grades.items():
        print(type(y))
>>> <class 'list'>

因此，您需要一些额外的代码来浏览字典列表：

courses = ",".join(h["course"] for h in y)

因此，最终代码变成：

from collections import defaultdict
from prettytable import PrettyTable
import os


class University:
    def __init__(self, path):
        self.students = dict()
        self.instructors = dict()
        self.grades = defaultdict(list)
        self.path = path

    def gg(self):
        for filename in os.listdir(self.path):
            with open(os.path.join(self.path, filename), "r") as f:
                if filename == "students.txt":
                    for line in f:

                        a, b, c = line.split("\t")
                        self.students[a] = {"name": b, "major": c}

                elif filename == "grades.txt":
                    for line in f:

                        d, e, f, g = line.split("\t")
                        self.grades[d].append(
                            {"course": e, "grade": f, "instructor": g}
                        )

        pt: PrettyTable = PrettyTable(
            field_names=[
                "CWID",
                "Name",
                "cc",
            ]
        )

        for i, j in self.students.items():
            for x, y in self.grades.items():
                if i == x:
                    courses = ",".join(h["course"] for h in y)
                    pt.add_row([i, j["name"], courses])

        return pt


a = University("C://Users/Swayam/Documents/Downloads")
c = a.gg()
print(c)

我在运行上述代码时得到以下输出：

+-------+------------+------------------------+
|  CWID |    Name    |           cc           |
+-------+------------+------------------------+
| 10103 | Baldwin, C | SSW 567,SSW 564,CS 501 |
| 10115 |  Wyatt, X  |    SSW 567,SSW 564     |
+-------+------------+------------------------+

然而，请注意，我确实必须改变：

您用于正则表达式拆分的

拆分

，因为

\t

没有被我识别

将

self.path=path

添加到您的

\uuuu init\uuu

方法中

当然，道路也是如此

---

这仍然使j[“name”]出现相同的错误，我尝试在j中为h添加name=“，”.join（h[“name”]但它抛出了一个关键错误我现在包含了完整的代码和我得到的输出，这是您正在运行的代码吗？我对

j[“name”]没有任何问题

因为

j

应该是一个包含关键字

名称的词典

+-------+------------+------------------------+
|  CWID |    Name    |           cc           |
+-------+------------+------------------------+
| 10103 | Baldwin, C | SSW 567,SSW 564,CS 501 |
| 10115 |  Wyatt, X  |    SSW 567,SSW 564     |
+-------+------------+------------------------+