ValueError：没有足够的值来解压缩（预期2，得到1）但是我提供了2个值(ValueError: not enough values to unpack (expected 2, got 1)

ValueError：没有足够的值来解压缩（预期2，得到1）但是我提供了2个值(ValueError: not enough values to unpack (expected 2, got 1) BUT i provide 2 values)

我正在研究这个代码，只是简单地将新数据添加到文本文件中，我让它工作但是我再次运行它并且它产生了错误“ValueError：没有足够的值来解包（预期2，得到1）”。 我知道这个错误意味着什么，我似乎提供了两个值？ 我一定错过了一些错误的东西？

它产生错误的代码：

schoolnames=[] scores=[] with open("Cdrive.txt","r")as a_file: for x in a_file.readlines(): data=x.strip() #Im aware i could just use data, but i use X to try fix the error, of course this didnt work print(data) school,score=data.split(",") #The error is produced here schoolnames.append(school) scores.append(score)

我的文本文件如下所示（文本文件中每个数据位之间没有行）：

SJP，15

chelmer，10

纽荷尔，20

Im working on this code that simply adds new data into a text file, and i had it working but then i ran it once more and it produced the errer "ValueError: not enough values to unpack (expected 2, got 1)". I know what this error means its just that i seem to provide two values? i must be missing something thats wrong?

The code where it produces an error:

schoolnames=[] scores=[] with open("Cdrive.txt","r")as a_file: for x in a_file.readlines(): data=x.strip() #Im aware i could just use data, but i use X to try fix the error, of course this didnt work print(data) school,score=data.split(",") #The error is produced here schoolnames.append(school) scores.append(score)

My text file looks like this (there are no lines between each bit of data in the text file):

sjp,15

chelmer,10

newhall,20

最满意答案

你可能有空行，你可以让它工作只需添加一个条件检查：

if data在空行上应用strip（）， if data为false。 你可以检查被剥离的行中是否有逗号

for x in a_file.readlines(): data=x.strip() if data and "," in data: school,score=data.split(",")

You may have blank lines, you can make it work just add one condition checking:

if data would be false if you apply strip() on a blank line. you can check whether comma in the stripped line

for x in a_file.readlines(): data=x.strip() if data and "," in data: school,score=data.split(",")