您可以尝试使用以下代码等待直到出现新窗口：
webdriverwait(driver, 20).until(EC.number_of_windows_to_be(2))
您的代码应如下所示
Button.click()
webdriverwait(driver, 20).until(EC.number_of_windows_to_be(2))
newWindow = driver.window_handles
newNewWindow = newWindow[1]
driver.switch_to.window(newNewWindow)
考虑到@JimEvans评论，请尝试以下操作：
current = driver.window_handles[0]
Button.click()
webdriverwait(driver, 20).until(EC.number_of_windows_to_be(2))
newWindow = [window for window in driver.window_handles if window != current][0]
driver.switch_to.window(newWindow)
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