Attribute has no text in the variable, but the text is printed out

Question

I can't figure out why the code works in one case and gives an error in the other.

Working code:

import xml.etree.ElementTree as ET
import requests
baza=[]
document = ET.parse('xml_.xml')
doc=document.getroot()
x = doc.find('shop')
y = x.find('offers')
for z in y.findall('offer'):
    vnd_tmp = z.find('vendorCode')
    prc_tmp = z.find('price')
    #tmp = vnd_tmp.text, prc_tmp.text
    print(vnd_tmp.text, prc_tmp.text)

It is necessary to replace "print" with a variable, an error immediately occurs AttributeError: 'NoneType' object has no attribute 'text':

import xml.etree.ElementTree as ET
import requests
baza=[]
document = ET.parse('xml_.xml')
doc=document.getroot()
x = doc.find('shop')
y = x.find('offers')
for z in y.findall('offer'):
    vnd_tmp = z.find('vendorCode')
    prc_tmp = z.find('price')
    tmp = vnd_tmp.text, prc_tmp.text
    #print(vnd_tmp.text, prc_tmp.text)