选项1

Question

当我尝试从文件中读取时，我遇到了一个恼人的错误，我认为它与变量的列表格式有关，但我不确定。

如果有人可以帮助解决这个问题，那就太棒了。我认为这也与列表末尾的打印有关。

这是我的代码：

选项1

    def one():
        print ("")
        print ("You have chosen to read the file!")
        print ("")
        file = open("sentence.txt" , "r")
        words = file.readlines(1)
        nums = file.readlines(2)
        #Remove "\n"
        #This bit doesn't work, I'm not sure how to remove "\n" 

        #These were me trying to get rid of the "\n"
        #map(str.strip, words)
        #words = words.strip('\n')

        print(words)
        print (nums)
        print ("")
        #Reconstruct sentence here

Answer 1

函数file.readlines()不接受行数的参数，它一次读取文件的所有行。（对于记录，如果你确实传递了像file.readlines(n)这样的参数，则参数n是一个＆＃34;提示＆＃34;关于要读取的字节数...更多信息请点击{ {3}}）

   def one():
        print ("")
        print ("You have chosen to read the file!")
        print ("")
        file = open("sentence.txt" , "r")
        lines = file.readlines() # read all the lines into a list
        words = lines[0]
        nums = lines[1]
        #Remove "\n"
        #This bit doesn't work, I'm not sure how to remove "\n" 

        #These were me trying to get rid of the "\n"
        #map(str.strip, words)
        words = words.strip("\n][").replace("'", "").split(",")

        nums = nums.strip("\n][").replace("'", "").split(",")
        nums = list(map(int, numbers))  ## assuming you want to convert the string to integers, use this

        print(words)
        print (nums)
        print ("")
        #Reconstruct sentence here
        remade_sentence = ' '.join([words[i-1] for i in nums])  ## changed empty string to space to add spaces
        print (remade_sentence)

        file.close() ## also, make sure to close your file!

编辑：我已更新代码以处理nums作为字符串列表编辑2：更新代码以反映@ notevenwrong删除括号和引号的方法

编辑3：重新简化...当我在文本编辑器中打开输入文件时，我真的看到了：

['the', 'dog', 'cat']
[1, 1, 1, 2, 1, 3]

如果这不是正确的输入，则此代码可能无效。

Answer 2

file.readlines(1)返回的是单个元素列表，元素是字符串。您想要做的是获取字符串本身并替换＆＃39; \ n＆＃39;，＆＃39; [＆＃39;，＆＃39;]＆＃39;等。

尝试 words[0].strip("\n][").replace("'", "").split(",")

Answer 3

你在[单词[i-1]中得到例外，因为我是str，你可以表演 - ：＆＃39; str＆＃39;和＆＃39; int＆＃39;。

>>> i = '1'
>>> i -1

Traceback (most recent call last):
  File "<pyshell#101>", line 1, in <module>
    i -1
TypeError: unsupported operand type(s) for -: 'str' and 'int'

快速修复应该是 -

remade_sentence = ''.join([words[int(i)-1] for i in nums])

Python从文件中读取列表并在空闲错误中打印回来

选项1

3 个答案: