Question

请帮助我我的代码有什么问题？我的代码写名字，平均（等级）输出

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 1

在“ with”语句之后您没有缩进

如here所述，您必须在“ with”语句之后缩进

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")

我还认为您是指 fw 而不是 f2

Answer 2

打开文件时，您缺少缩进。看到错误如何使您指向第4行？当使用context manager打开文件时，以及任何时候使用控制语句（如果是，则等），都必须缩进下一行。

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")

打开csv文件并编写

2 个答案: