蟒蛇lxml。 将 findall 与变量一起使用

Question

An XML snippet looks like this:

    <certificate name='first_item'>First text,</certificate>
    <certificate name='second_item'>Second text,</certificate>
    <certificate name='second_item'>Third text,</certificate

I can easily pick out an element using findall():

mystring = xmlroot.findall('certificate[@name="first_name"]').text

But I can't do that using a variable:

item_option = 'first_item'
mystring = xmlroot.findall('certificate[@name=item_option]').text
full_search_string = 'certificate[@name="first_name"]'
mystring = xmlroot.findall(full_search_string).text

Both of these last options fail. How do I insert a String variable into the findall() method? If I don't want to hard code the filter based on name attribute, how can I do that?

Answer 1

Try concatenating the variable to the string. Your variable is being passed as a string and therefore not interpreted.

mystring = xmlroot.findall('certificate[@name="' + item_option + '"]')