How to use "not" in xpath?

you can use not(expression) function

expression != true()

not() is a function in XPath (as opposed to an operator), so

//a[not(contains(@id, 'xx'))]

None of these answers worked for me for python. I solved by this

a[not(@id='XX')]

Also you can use or condition in your xpath by | operator. Such as

a[not(@id='XX')]|a[not(@class='YY')]

Sometimes we want element which has no class. So you can do like

a[not(@class)]

Use boolean function like below:

//a[(contains(@id, 'xx'))=false]

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