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Selecting Dynamic Element in Drop Down Menu, Selenium Python

I am trying to select an input box in a drop down menu. The input box itself, however, appears to be dynamic. I've looked through similar posts, but they seem to be issue specific. I've had this problem a few times now with dynamic elements, and I'm hoping to understand a general approach to working with dynamic elements.
Here are the details of the element I seek to select:
<input class="lui-search__input ng-pristine ng-valid ng-empty ng-valid-maxlength ng-touched" maxlength="5000" q-placeholder="Object.Listbox.Search" ng-model="query" ng-disabled="disabled" autocomplete="" spellcheck="false" ng-trim="false" type="text" qva-blur="blurred()" qva-focus="autoFocus" qv-escape="escape($event)" qv-enter="enter($event)" placeholder="Search in listbox" aria-invalid="false" xpath="1">
(if this isn't helpful information, please let me know and I will update).
The relative xpath changes:
//body/div[8]/div[1]/div[1]/div[1]/ng-transclude[1]/div[1]/div[3]/div[1]/article[1]/div[1]/div[1]/div[1]/div[1]/div[1]/div[1]/input[1]
in one instance
Another instance of the relative xpath:
//body/div[7]/div[1]/div[1]/div[1]/ng-transclude[1]/div[1]/div[3]/div[1]/article[1]/div[1]/div[1]/div[1]/div[1]/div[1]/div[1]/input[1]
I have tried to select by class and css selector with no luck. I'd really like to understand how to approach this specific issue, and also a general idea of where in an element I should play around with for future instances of dynamic elements.
Thanks!
(If the element details I provided are not helpful, the element can also be accessed with the below code:)
driver.get("https://bi.prozorro.org/sense/app/fba3f2f2-cf55-40a0-a79f-b74f5ce947c2/sheet/NFTrm/state/analysis")
driver.find_element_by_xpath("//thead/tr[1]/th[2]").click()
#the input box I am attempting to select to no avail:
while True:
try:
WebDriverWait(driver, 25).until(EC.presence_of_element_located((By.XPATH, "//body/div[7]/div[1]/div[1]/div[1]/ng-transclude[1]/div[1]/div[3]/div[1]/article[1]/div[1]/div[1]/div[1]/div[1]/div[1]/div[1]/input[1]")))
break
except TimeoutException:
print("Loading took too much time!")

The WebElement is an Angular element. So ideally to click on the element you need to induce WebDriverWait for the element_to_be_clickable() and you can use either of the following Locator Strategies:
Using XPATH:
driver.get('https://bi.prozorro.org/sense/app/fba3f2f2-cf55-40a0-a79f-b74f5ce947c2/sheet/NFTrm/state/analysis')
WebDriverWait(driver, 60).until(EC.element_to_be_clickable((By.XPATH, "//th[#tid='st.header']//span[#title='Учасник']//following::th[#tid='st.header.search']"))).click()
WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//input[#placeholder='Search in listbox']"))).click()
Note: You have to add the following imports :
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
Browser Snapshot:

You can use one of it's attributes to find it.
XPATH:
//input[#placeholder='Search in listbox']

Python selenium presence_of_element_located with only href

I am trying to click on a link in a forum using Selenium, but I need to wait until the page load, so i thought the better way was to use WebDriverWait. This is my code I used to test it:
driver.get("https://testocolo.forumcommunity.net")
#First click, working
driver.find_element_by_xpath('//a[#href="'+"/?f=9087616"+'"]').click()
try :
element = WebDriverWait(driver, 2).until(
EC.presence_of_element_located(By.XPATH, '//a[#href="'+"/?t=61904616"+'"]')
)
element.click()
except :
print("NO")
This is the element
Brotha
The try except cycle ends up every time printing "NO".
Before that I tried locating by LINK_TEXT instead, with 'Brotha' but in neither way works. Where am I doing wrong?

xpath you can try
//a[contains(#tittle,'discussione inviata il')]
or
//*[text()='Brotha']
Next option you can check is if that element is in iframe?
WebDriverWait(driver, 30).until(
EC.element_to_be_clickable((By.XPATH, "//*[text()='Brotha']")))

Selenium not extracting info using xpath

I am trying to extract some information from the amazon website using selenium. But I am not able to scrape that information using xpath in selenium.
In the image below I want to extract the info highlighted.
This is the code I am using
try:
path = "//div[#id='desktop_buybox']//div[#class='a-box-inner']//span[#class='a-size-small')]"
seller_element = WebDriverWait(driver, 5).until(
EC.visibility_of_element_located((By.XPATH, path)))
except Exception as e:
print(e)
When I run this code, it shows that there is an error with seller_element = WebDriverWait(driver, 5).until( EC.visibility_of_element_located((By.XPATH, path))) but does not say what exception it is.
I tried looking online and found that this happens when selenium is not able to find the element in the webpage.
But I think the path I have specified is right. Please help me.
Thanks in advance
[EDIT-1]
This is the exception I am getting
Message:

//div[class='a-section a-spacing-none a-spacing-top-base']//span[class='a-size-small a-color-secondary']
XPath could be something like this. You can shorten this.
CSS selector could be and so forth.
.a-section.a-spacing-none.a-spacing-top-base
.a-size-small.a-color-secondary

I think the reason is xpath expression is not correct.
Take the following element as an example, it means the span has two class:
<span class="a-size-small a-color-secondary">
So, span[#class='a-size-small') will not work.
Instead of this, you can ues xpath as
//span[contains(#class, 'a-size-small') and contains(#class, 'a-color-secondary')]
or cssSelector as
span.a-size-small.a-color-secondary

Amazon is updating its content on the basis of the country you are living in, as I have clicked on the link provided by you, there I did not find the element you are looking for simply because the item is not sold here in India.
So in short if you are sitting in India and try to find your element, it is not there, but as you change the location to "United States". it is appearing there.
Solution - Change the location

To print the Ships from and sold by Amazon.com of an element you have to induce WebDriverWait for the visibility_of_element_located() and you can use either of the following Locator Strategies:
Using CSS_SELECTOR and get_attribute():
print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.CSS_SELECTOR, "div.a-section.a-spacing-none.a-spacing-top-base > span.a-size-small.a-color-secondary"))).get_attribute("innerHTML"))
Using XPATH and text attribute:
print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//div[#class='a-section a-spacing-none a-spacing-top-base']/span[#class='a-size-small a-color-secondary']"))).text)
Note : You have to add the following imports :
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
You can find a relevant discussion in How to retrieve the text of a WebElement using Selenium - Python
Outro
Link to useful documentation:
get_attribute() method Gets the given attribute or property of the element.
text attribute returns The text of the element.
Difference between text and innerHTML using Selenium

InvalidElementStateException invalid element state: Element must be user-editable in order to clear it" error while sending text with Selenium Python

I have an input HTML element like this in Django
<input id="id" type="number" maxlength="50">
When I want to find and clear it
elm_input = self.wait.until(EC.presence_of_element_located((By.ID, elm_id)))
elm_input.clear()
elm_input.send_keys(value)
It's got error InvalidElementStateException
InvalidElementStateException invalid element state: Element must be user-editable in order to clear it"
We cannot send key clear because selenium know CLEAR or DELETE Keys is an Charactics Keys not an Number Keys, It's don't send Keys to element input. So how can I we fix it, I had try ActionChains but It's not working with as well

This error message...
InvalidElementStateException invalid element state: Element must be user-editable in order to clear it"
...implies that the WebDriver instance was unable to clear the existing contents of the element.
A bit more of the outerHTML of the element would have helped us to analyze the issue in a better way. However you need to take care of a couple of things as follows:
While sending a character sequence instead of using presence_of_element_located() you have to induce WebDriverWait for the element_to_be_clickable().
Ensure the Locator Strategy uniquely identifies the WebElement and you can use either of the following Locator Strategies:
Using CSS_SELECTOR:
elm_input = WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.CSS_SELECTOR, "input#id[type='number'][maxlength='50']")))
elm_input.clear()
elm_input.send_keys("1234567890")
Using XPATH:
elm_input = WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//input[#id='id' and #type='number'][#maxlength='50']")))
elm_input.clear()
elm_input.send_keys("1234567890")
Note : You have to add the following imports :
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
Reference
You can find a relevant discussion in:
Invalid element state: Element must be user-editable in order to clear it error trying to click and insert a date on a dropdown-toggle using Selenium

Element is visible but cannot be found by webdriver

I'm using selenium and python for automated test and have an issue when try to click on an element in web.
I'm using find_element_by_xpath, provide the correct path (I have try on browser and it return 1 of 1).
driver = webdriver.Chrome()
driver.get('page_url')
driver.find_element_by_xpath(//button[#class="aoc-end md-button md-ink-ripple"])
Here is html:
<div class="_md md-open-menu-container md-whiteframe-z2 md-active md-clickable" id="menu_container_77" style="top: 499px; left: 866px; transform-origin: right top;" aria-hidden="false">
<md-menu-content class="agent-dropdown-menu-content new-menu-content" width="3" role="menu"><!----><md-menu-item>
<button class="aoc-end-work md-button md-ink-ripple" type="button" ng-transclude="" ng-disabled="!agent.capabilities.canSupervisorLogout" ng-click="logOutAgent(agent.userHandle)" role="menuitem">
The element should be found but actual result is that selenium.common.exceptions.ElementNotVisibleException: Message: element not visible

From the exception, it seems the element is present of the page but currently not visible.
Possible reason for invisibility of element can be (element is masked by another element, element can be in a drop - down list etc. ). If element is in drop-down list, then first open the list and then find the element.
Hope it will help.

Finding locators in web application developed in angular is quite tricky, especially when the developers don't follow any of guidelines useful from an automation perspective, like adding unique attributes for every web elements and etc...
In your case, it seems that the same thing is happening.
Following locator should work for you (by the way, you missed "" after and before locator in driver.find_element_by_xpath() method):
driver.find_element_by_xpath("//button[#ng-click='logOutAgent(agent.userHandle)']");

Since the element you are trying to click is a dynamic element, you will need to wait for it to become clickable before clicking on it. Use Expected conditions and WebDriver wait:
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
element = WebDriverWait(driver, 20).until(
EC.element_to_be_clickable((By.XPATH, "//button[#class='aoc-end md-button md-ink-ripple']"))).click()
Also, notice the " " and ' ' quotes on the outer and inner xpath selector.