在 CSV 文件的每行末尾附加项目

Question

我正在尝试编写一个编写 CSV 文件的代码，该文件具有 1 个标题行和 20 个其他行，每行包含以下内容：1 个随机名称、8 个等级 [随机生成] 和 1 个最终平均成绩从其他 8 个随机等级。我已经阅读了该文件并生成了平均最终成绩并将其附加到一个空列表中，以便我可以将其重新输入到文件中，但是我无法将它们写入/附加回文件中。

我看到没有x.writecolumns()，我在尝试完成这一步时遇到了很多麻烦。这是我到目前为止所拥有的。在此先感谢任何过来提供建议的人。

import random
import csv

fname = ['Red', 'Jose', 'Mikasa', 'Sakura', 'Naruto', 'Momoka', 'Zero', 'Ryu', 'Ken', 'Geralt', 'Greg', 'Mika', 'Momo',
     'Xenovia', 'John', 'Gary', 'Lance', 'Eren', 'Duke', 'Claire']
lname = ['Akerman', 'Haruno', 'Johnson', 'Rivia', 'Valentine', 'Redfield', 'Kennedy', 'Juarez', 'Jameson', 'Williams',
     'Miller', 'Davis', 'Thompson', 'Garcia', 'Remington', 'Hayabusa', 'Strife', 'Armstrong', 'Kojima', 'Chambers']

avg_list = list() 
#^List where im appending all the average grades for all students

def ranint():
    value = random.randint(60, 100)
    return value
#^random value generator 

def ranname():
    first = random.choice(fname)
    last = random.choice(lname)
    fname.remove(first)
    lname.remove(last)
    return ("; ".join([first, last]))
#^picks a random first name and random last name

#CSV writer that has 1 header row and 20 other rows, each consisting of 1 name, 8 random grades, and 1 final grade averaged from the other 8
with open('grades2.csv', 'w', newline='') as fp:
a = csv.writer(fp, delimiter=',')
data = [['Name', 'If Else', 'Loops', 'Functions', 'File IO', 'Conditionals', 'Repetition', 'Python Functions',
         'Input Output', 'Grade'],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
        [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()]]
a.writerows(data)
fp.close()

#Reads the file, sums all 8 grades and gets the average. Does this for all students and then appends the results to a empty list
with open('grades2.csv', 'r+', newline='') as fh:
z = csv.reader(fh)
next(z)   #skip the header
for row in z:
    integers = [int(i) for i in row[1:9]]
    avg_integers = sum(integers) / len(integers)
    avg_list.append(avg_integers)
    print(avg_integers) #This is just here to check with the final CSV file
fh.close()

Answer 1

我相信您在这里唯一的选择是创建一个包含平均成绩的所有行数据的列表，然后清除文件的内容并重新写入 csv。请参阅下面的代码：

import random
import csv

fname = ['Red', 'Jose', 'Mikasa', 'Sakura', 'Naruto', 'Momoka', 'Zero', 'Ryu', 'Ken', 'Geralt', 'Greg', 'Mika', 'Momo',
     'Xenovia', 'John', 'Gary', 'Lance', 'Eren', 'Duke', 'Claire']
lname = ['Akerman', 'Haruno', 'Johnson', 'Rivia', 'Valentine', 'Redfield', 'Kennedy', 'Juarez', 'Jameson', 'Williams',
     'Miller', 'Davis', 'Thompson', 'Garcia', 'Remington', 'Hayabusa', 'Strife', 'Armstrong', 'Kojima', 'Chambers']

avg_list = list() 
#^List where im appending all the average grades for all students

def ranint():
    value = random.randint(60, 100)
    return value
#^random value generator 

def ranname():
    first = random.choice(fname)
    last = random.choice(lname)
    fname.remove(first)
    lname.remove(last)
    return ("; ".join([first, last]))
#^picks a random first name and random last name

#CSV writer that has 1 header row and 20 other rows, each consisting of 1 name, 8 random grades, and 1 final grade averaged from the other 8
with open('C:/react/learnnextjs-demo/pages/grades2.csv', 'w', newline='') as fp:
    a = csv.writer(fp, delimiter=',')
    data = [['Name', 'If Else', 'Loops', 'Functions', 'File IO', 'Conditionals', 'Repetition', 'Python Functions',
             'Input Output', 'Grade'],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()],
            [ranname(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint(), ranint()]]
    a.writerows(data)
    fp.close()

#Reads the file, sums all 8 grades and gets the average. Does this for all students and then appends the results to a empty list
with open('grades2.csv', 'r+', newline='') as fh:

    reader =  csv.reader(fh)
    next(reader)   #skip the header
    allRows = []
    for row in reader:
        integers = [int(i) for i in row[1:9]]
        avg_integers = sum(integers) / len(integers)
        row.append(avg_integers) #This is just here to check with the final CSV file
        allRows.append(row)
    fh.close()
    with open('grades2.csv', "w+", newline='') as fw:
        writer = csv.writer(fw)
        writer.writerows(allRows)
    fw.close()