Question

我遇到一个错误，说“ del ports_db_names [0]”处不存在该索引，但该索引处有一个变量

代码的前6行是我要通过函数执行的操作，因为我希望能够从列表中添加或删除列表，并且仍然能够将所有变量转换为字符串。我尝试执行str（ports_db_names），但是当我尝试在函数中使用它时似乎不起作用，但是当我手动将它们转换为字符串时，它起作用了。

connection_url_1 = (str(ports_db_names[0]))
    connection_url_2 = (str(ports_db_names[1]))
    connection_url_3 = (str(ports_db_names[2]))
    connection_url_4 = (str(ports_db_names[3]))
    #this list is what I want to create through a function by converting each connection_url tag to a string
    list = [connection_url_1, connection_url_2, connection_url_3, connection_url_4]
 #########################################################
    import bs4 as bs
    import lxml
    #used for increments
    plus_1 = 1
    #opens and parses the domain.xml file
    xml_file = open('domain.xml')
    soup = bs.BeautifulSoup(xml_file, 'lxml')
    #creates a list containing all the connection-url tags
    ports_db_names = (soup.find_all('connection-url'))
    #function for converting variables in list into string
    def connection_urls(x):
      # creates an list
      connection_urls = []
      #number used for naming the variables
      n = 1
      #used to iterate through the list
      i = len(ports_db_names)
      #used to iterate through list until there are no more variables to go through
      while (i > 0):
        #renames each variable to "connection_url_" and the a number is added to insure the order 
        x = "connection_url_" + str(n)
        #adds the variable to a new list
        connection_urls.append(x)
        #increments n so that the next connection_url_ is one number above the previous
        n = n + plus_1
        #deletes the variable at index 0 from the original list so that the next variable can go through the function just like the previous variable
        del ports_db_names[0]
        #when i is = 0 meaning all the variables went through the function it will return the array with all the variables converted to strings.
      else:
        return connection_urls

    print (connection_urls(ports_db_names))
    ###############################################################################
#this is the contents of the xml file I parsed and I named it domain.xml
    <connection-url>jdbc:oracle:thin:@test1:1675</connection-url>
    <connection-url>jdbc:oracle:thin:@test2:1345</connection-url>
    <connection-url>jdbc:oracle:thin:@test3:1434</connection-url>
    <connection-url>jdbc:oracle:thin:@test4:1755</connection-url>

Answer 1

我不是100％知道您要寻找什么，但这有帮助吗？

import bs4 as bs

# opens and parses the domain.xml file
with open('domain.xml') as xml_file:
    soup = bs.BeautifulSoup(xml_file, 'lxml')
    # creates a list containing all the connection-url tags
    ports_db_names = soup.find_all('connection-url')

ports_db_names = map(str, ports_db_names)

这将从XML文件中恢复所有连接URL标记，并将它们转换为字符串列表。

然后，您可以按照自己喜欢的任何方式打印它们。

print("\n".join(ports_db_names))

我试图通过遍历每个变量并将其转换为字符串，然后将其附加到新列表，将列表转换为字符串

1 个答案: