The specification of the options 'top' and 'bottom' seems to have a strange behavior. The following answered question gave some useful insights, but does not cure everything.
With the code :
import sys
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
app = QApplication(sys.argv)
input = QLineEdit()
input.setValidator(QDoubleValidator(0.00,10.00,5,notation=QDoubleValidator.StandardNotation))
input.show()
sys.exit(app.exec_())
The input box accepts any number below 100, but I would expect only numbers below 10 ... For example, 99.55656 is accepted just fine...
What do I miss ?
In your example, the line-edit does not literally accept the value 99.55656. This can be confirmed by calling its hasAcceptableInput method, which returns False.
The validator is allowing the value to be entered, because doing so produces a valid Intermediate state. According to the docs, this can happen "if it is likely that a little more editing will make the input acceptable". So in the specific case of 99.55656, deleting a 9 would produce a valid Acceptable state. This would seem to imply that "a little more editing" should be taken to mean adding or removing a single character (where the notation is StandardNotation).