Question

我需要一个二维列表来存储有关学生及其成绩的信息。

当我运行我的程序时，我只得到一个数字列表，但我需要为每个学生提供不同的列表。

这是我到目前为止所做的：

COLS= int(input("number of students to enter "))
ROWS= int(input("number of grades per student "))

def main():
    number =[]
for c in range(COLS):
    grades = []
    student =(input("enter student ID number "))
    number.append(student)
    number.append(grades)

for r in range (ROWS):
    grade =(input("Enter grade for module: "))
    grades.append(grade)

print(number)

当我运行该程序时，它表示有一个缩进的块并突出显示＆＃34;等级＆＃34; 我做错了什么？

Answer 1

具有正确缩进的代码：

COLS= int(input("number of students to enter ")) 
ROWS= int(input("number of grades per student "))

def main(): 
    number =[]

    for c in range(COLS):
        grades = []
        student =(input("enter student ID number "))
        number.append(student)
        number.append(grades)

    for r in range (ROWS):
        grade =(input("Enter grade for module: "))
        grades.append(grade)

    print(number)

main()

现在执行。

这是替代版本，更好的IMO：

from collections import OrderedDict

COLS= int(input("number of students to enter: ")) 
ROWS= int(input("number of grades per student: "))

def main(): 
    student_grades  = OrderedDict()

    for c in range(COLS):  

        student =(input("enter student ID number: "))
        student_grades[student] = []

        for r in range(ROWS):
            grade =(input("Enter grade for module: "))
            student_grades[student].append(grade)

    print(student_grades)
    # exaple output OrderedDict([('123', ['2', '3']), ('412', ['4', '5'])])

main()

Answer 2

你可能想要的是一个列表，其中包含第一个位置的学生ID和后续位置的成绩：

students= int(input("number of students to enter: ")) 
grades= int(input("number of grades per student: ")) + 1

class = []
for i in range(students):
    for j in range(grades):
        if j == 0:
            m = input("Please input Student ID: ")
            class.append(m)
        elif:
            m = input("Please input %j th grade: ")
            class.append(m)

Answer 3

二维列表如下所示：

two_dim = [[0,1,1,1,1,1],
          [1,0,1,0,0,0],
          [1,1,0,1,1,0]]

因此，每个行都是不同的列表，它们组合在另一个列表中。要调用元素，只需输入

即可

two_dim[row_number][column_number]

这是Google搜索者的一般答案，现在针对您的问题，您需要将输入括在括号中以将行作为列表传递，而不是以单维列表结束。我会用这样的东西代替：

student_count= int(input("number of students to enter ")) 
grade_count = int(input("number of grades per student "))

grades = []

for i in range(student_count):
    print("The next student")
    grades.append([int(input("The next student grade")) for j in range(grade_count)])

print(grades)

Answer 4

Matrix = [5][5]

Matrix = [[0 for x in range(5)] for x in range(5)]

您现在可以将项目添加到列表中：

Matrix[0][0] = 1 Matrix[4][0] = 5 print Matrix[0][0] # prints 1 print Matrix[4][0] # prints 5

如何创建二维列表

4 个答案: