打开csv文件并写入

Question

请帮我什么是我的代码问题？我的代码编写名称，输出的意思是（等级）import csvfrom statistics import meanwith open('C:/Users/sina/Desktop/python pt/jalase19.csv' , 'r') as fo:reader = csv.reader(fo)for row in reader :    name = row[0]    grades = list()    for grade in row[1:]:        grades.append(float(grade))        with open('C:/Users/sina/Desktop/python pt/jalase20.csv' , 'w') as fw:            fw.write("name , mean(grades)\n")

Answer 1

您没有在“with”语句后缩进

如此处所述，您必须在“with”语句后缩进

您的代码应如下所示：

import csv

from statistics import mean

with open('C:/Users/sina/Desktop/python pt/jalase19.csv' , 'r') as fo:

    reader = csv.reader(fo)

    for row in reader :

        name = row[0]

        grades = list()

        for grade in row[1:]:

            grades.append(float(grade))

            with open('C:/Users/sina/Desktop/python pt/jalase20.csv' , 'w') as fw:

                fw.write("name , mean(grades)\n")

Answer 2

打开文件时，您缺少缩进。看看错误如何将您指向第 4 行？使用上下文管理器打开文件时以及任何时候使用控制语句（if、else、for 等）时，下一行都必须缩进。

import csv

from statistics import mean

with open('C:/Users/sina/Desktop/python pt/jalase19.csv', 'r') as fo:

    reader = csv.reader(fo)

    for row in reader:

        name = row[0]

        grades = list()

        for grade in row[1:]:

            grades.append(float(grade))

        with open('C:/Users/sina/Desktop/python pt/jalase20.csv' , 'w') as f2:

            f2.write("name , mean(grades)\n")