调试帮助：循环超出范围时出错

Question

是我的第一篇文章，对不起格式

问题： 我的输出有错误，数据输出是正确的，但是循环超出范围，我不知道如何修复它。

代码：

exam_file=open('mean_text.txt', 'a+')
exam_file.write("Rio de Janeiro,Brazil,30.0,18.0\n")

exam_file.seek(0)
headings=exam_file.readline().split(",")

exam_file.seek(0,1)
city_temp=exam_file.readline().split(",")

while city_temp:
    print(headings[0].capitalize()+" of "+city_temp[0]+" "+ headings[2]+" is "+city_temp[2]+" Celsius")
    city_temp = exam_file.readline().split(",")

exam_file.close()

输出：

City of Beijing month ave: highest high is 30.9 Celsius
Traceback (most recent call last):
City of Cairo month ave: highest high is 34.7 Celsius
City of London month ave: highest high is 23.5 Celsius
  File "./Module4task.py", line 11, in <module>
City of Nairobi month ave: highest high is 26.3 Celsius
City of New York City month ave: highest high is 28.9 Celsius
    print(headings[0].capitalize()+" of "+city_temp[0]+" "+ headings[2]+" is "+city_temp[2]+" Celsius")
City of Sydney month ave: highest high is 26.5 Celsius
IndexError: list index out of range
City of Tokyo month ave: highest high is 30.8 Celsius
City of Rio de Janeiro month ave: highest high is 30.0 Celsius

.txt 文件内容：

city,country,month ave: highest high,month ave: lowest low
Beijing,China,30.9,-8.4
Cairo,Egypt,34.7,1.2
London,UK,23.5,2.1
Nairobi,Kenya,26.3,10.5
New York City,USA,28.9,-2.8
Sydney,Australia,26.5,8.7
Tokyo,Japan,30.8,0.9

预期：

City of Beijing month ave: highest high is 30.9 Celsius
City of Cairo month ave: highest high is 34.7 Celsius
City of London month ave: highest high is 23.5 Celsius
City of Nairobi month ave: highest high is 26.3 Celsius
City of New York City month ave: highest high is 28.9 Celsius
City of Sydney month ave: highest high is 26.5 Celsius
City of Tokyo month ave: highest high is 30.8 Celsius
City of Rio De Janeiro month ave: highest high is 30.0 Celsius

我的任务：

添加里约天气

1. 以追加模式（'a+'）打开文件

2. 为 Rio de Janeiro 写一个新行 "Rio de Janeiro,Brazil,30.0,18.0\n" 抓住列标题

3. 使用 .seek() 将指针移动到文件的开头
4. 将第一行文本读入一个名为：标题的变量中
5. 使用 .split(',') 将标题转换为列表，在每个逗号上拆分

使用 while 循环从文件中读取剩余的行

1. 将剩余的行分配给 city_temp 变量
2. 对循环中的每个 .readline() 使用 .split(',') 将 city_temp 转换为列表
3. 打印每个城市和最高月平均气温
4. 关闭 mean_temps

提示和提示：

• 打印标题以确定用于最终输出的索引（标题[0]、[1]、[2]..中的内容是什么？）

• city_temp 数据遵循标题的顺序（city_temp[0] 由标题[0] 描述）

• 输出应如下所示：北京的“month ave:highest high”为 30.9 摄氏度

• 使用 .split(',') 将 city_temp 转换为列表

Answer 1

尝试改变while循环，这样你就有了一个端点

就像在到达文件末尾后尝试添加一个 break 语句（使用 len 来查找它的长度）

或者你可以在你的while语句中添加一个条件来检查文件是否在末尾​​p>