在Findall，Lxml中添加OR条件

Question

I have the following findall expression :

for r in p.findall('.//r'):
                 for a in r.findall('.//br'):
                    text+= " "
                 for c in r.findall('.//tab'):
                     text+= " "  

And i want to add a space in the text variable if i come across the tag "br" or "tab" , but I want to use a single expression rather than 2 separate ones. something like:

for a in r.findall('.//br'|'.//tab'):

but this returns an unsupported operand type error.

TypeError: unsupported operand type(s) for |: 'str' and 'str'

What is the right syntax for this?

Answer 1

The code is using | operator for two string operands.

>>> 'a' | 'b'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for |: 'str' and 'str'

Specify | inside the string literal. And use xpath method :

for a in r.xpath('.//br|.//tab'):

---

If you want to use findall , concatenate two list into one and iterate it:

for a in r.findall('.//br') + r.findall('.//table'):

or using itertools.chain :

import itertools

for a in itertools.chain(r.findall('.//br'), r.findall('.//table')):