Python College

Is the itertools C module included somehow in the main Python binary in 3.x? Assuming that the C m… Read more In Python 3.x, Why Is There Not An Itertools Shared-object On Disk?

I spent some time investigating the collections.namedtuple module a few weeks ago. The module uses … Read more Why Doesn't The Namedtuple Module Use A Metaclass To Create Nt Class Objects?

I'm reading each line of a file into both a list and a dict, with open('../data/title/prune… Read more Why Isn't My Dict Lookup Faster Than My List Lookup In Python?

There is puzzling (at least for me) behavior of Python's set in combination with NaNs (here liv… Read more Causes For Inconsistent Behavior When Adding Nans To A Set

When I try to use print without parentheses on a simple name in Python 3.4 I get: >>> prin… Read more Printing Without Parentheses Varying Error Message Using Python 3

I've heard that __slots__ makes objects faster by avoiding a dictionary lookup. My confusion co… Read more How Does __slots__ Avoid A Dictionary Lookup?

Our code takes 10 minutes to siphon thru 68,000 records when we use: new_file = new_file + line + s… Read more Why Is 'new_file += Line + String' So Much Faster Than 'new_file = New_file + Line + String'?

I'm using map_async to create a pool of 4 workers. And giving it a list of image files to proce… Read more Multiprocessing - Cancel Remaining Jobs In A Pool Without Destroying The Pool

What's the runtime of Python's strip()? Since remove is O(n) for a single char, is strip O(… Read more What's The Runtime Of Python's Strip()?

In Python, when you have an object you can convert it to an integer using the int function. For ex… Read more Fraction Object Doesn't Have __int__ But Int(fraction(...)) Still Works

How does module loading work in CPython under the hood? Especially, how does the dynamic loading of… Read more How Does Module Loading Work In Cpython?

is in Python tests if 2 references point to the same object. Numbers between -5 and 256 are cached … Read more Why Does '20000 Is 20000' Result In True?

Coming from much less dynamic C++, I have some trouble understanding the behaviour of this Python (… Read more Writing (and Not) To Global Variable In Python

Recently i came across a question & confused with a possible solution, code part is // code p… Read more Handling Map Function In Python2 & Python3

From both Python2 Tutorial and Python3 Tutorial, there is a line in the midpoint of section 7.2.1 s… Read more In Python, What Is The Difference Between F.readlines() And List(f)

A generator is a special kind of iterator, and it has some methods that an normal iterator doesn… Read more Why Does Genexp(generator Expression) Is Called Genexp? Not Iterexp?

I'm trying to write a class in Python that behaves as a generator object, particularly in that … Read more How To Create A Custom Generator Class That Is Correctly Garbage Collected

Given Zero Piraeus' answer to another question, we have that x = tuple(set([1, 'a', … Read more Why Does Tuple(set([1,"a","b","c","z","f"])) == Tuple(set(["a","b","c","z","f",1])) 85% Of The Time With Hash Randomization Enabled?

Couldn't find much on this. Trying to compare 2 values, but they can't be equal. In my case… Read more When To Use `<>` And `!=` Operators?

When working with dictionaries in Python, this page says that the time complexity of iterating thro… Read more Python Dictionary Iterator Performance