query: id() function and is operator in python
positive_passages.docid: 4419
positive_passages.text: "is" operator behaves unexpectedly with integers
negative_passages.docid: 27461
negative_passages.text: What are valid values for the id attribute in HTML?
negative_passages.docid: 27627
negative_passages.text: Confusion with the assignment operation inside a falsy `if` block
negative_passages.docid: 102826
negative_passages.text: Easy way to check that a variable is defined in python?
negative_passages.docid: 105728
negative_passages.text: Overriding "+=" in Python? (__iadd__() method)
negative_passages.docid: 27583
negative_passages.text: Determine if object is integer
negative_passages.docid: 120169
negative_passages.text: Expected identifier, string or number
negative_passages.docid: 49518
negative_passages.text: What is the JavaScript >>> operator and how do you use it?
negative_passages.docid: 24725
negative_passages.text: isset() function is returning true even when item is not set
negative_passages.docid: 97856
negative_passages.text: Python: Difference between list.extend and list.__iadd__
negative_passages.docid: 148523
negative_passages.text: How to check whether operator== exists?
negative_passages.docid: 145497
negative_passages.text: What does the  operator do in python?
negative_passages.docid: 6369
negative_passages.text: Is there a spec that the id of elements should be made global variable?
negative_passages.docid: 68337
negative_passages.text: Is there a wildcard selector for identifiers (id)?
negative_passages.docid: 91633
negative_passages.text: Why don't we just use element IDs as identifiers in JavaScript?
negative_passages.docid: 53625
negative_passages.text: Duplicate id in list
negative_passages.docid: 74576
negative_passages.text: How to know if an object has an attribute in Python