Why are chained operator expressions slower than their expanded equivalent? Question: In python, it is possible to chain operators in this manner: a op b op c Which is evaluated to a op b and b op c With the only difference being that b is evaluated only once (so, something more like t = …
Comparing boolean and int using isinstance Question: Can someone give me an explanation why isinstance() returns True in the following case? I expected False, when writing the code. print isinstance(True, (float, int)) True My guess would be that its Python’s internal subclassing, as zero and one – whether float or int – both evaluate when …
Comparing Python dictionaries and nested dictionaries Question: I know there are several similar questions out there, but my question is quite different and difficult for me. I have two dictionaries: d1 = {‘a’: {‘b’: {‘cs’: 10}, ‘d’: {‘cs’: 20}}} d2 = {‘a’: {‘b’: {‘cs’: 30}, ‘d’: {‘cs’: 20}}, ‘newa’: {‘q’: {‘cs’: 50}}} i.e. d1 has …
Why are tuples constructed from differently initialized sets equal? Question: I expected the following two tuples >>> x = tuple(set([1, “a”, “b”, “c”, “z”, “f”])) >>> y = tuple(set([“a”, “b”, “c”, “z”, “f”, 1])) to compare unequal, but they don’t: >>> x == y >>> True Why is that? Asked By: Ashish Anand || Source …
How to compare two JSON objects with the same elements in a different order equal? Question: How can I test whether two JSON objects are equal in python, disregarding the order of lists? For example … JSON document a: { “errors”: [ {“error”: “invalid”, “field”: “email”}, {“error”: “required”, “field”: “name”} ], “success”: false } JSON …
Can you compare strings in python like in Java with .equals? Question: Can you compare strings in Python in any other way apart from ==? Is there anything like .equals in Java? Asked By: Michael || Source Answers: You could do: import operator a = “string1” b = “string2” print operator.eq(a, b) This is similar …
Compare two files report difference in python Question: I have 2 files called “hosts” (in different directories) I want to compare them using python to see if they are IDENTICAL. If they are not Identical, I want to print the difference on the screen. So far I have tried this hosts0 = open(dst1 + “/hosts”,”r”) …
Can't compare naive and aware datetime.now() <= challenge.datetime_end Question: I am trying to compare the current date and time with dates and times specified in models using comparison operators: if challenge.datetime_start <= datetime.now() <= challenge.datetime_end: The script errors out with: TypeError: can’t compare offset-naive and offset-aware datetimes The models look like this: class Fundraising_Challenge(models.Model): name …
How to test multiple variables for equality against a single value? Question: I’m trying to make a function that will compare multiple variables to an integer and output a string of three letters. I was wondering if there was a way to translate this into Python. So say: x = 0 y = 1 z …
double equals vs is in python Question: I run the following in the Python interpreter: >>> foo = 10 >>> dir(foo) == dir(10) True >>> dir(foo) is dir(10) False >>> Why is this? Asked By: ben || Source Answers: is checks that 2 arguments refer to the same object, == checks that 2 arguments have …
