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python Programming Glossary: why

What is a metaclass in Python?

http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python

capable of creating objects the instances and this is why it's a class . But still it's an object and therefore you can.. to create all classes behind the scenes. Now you wonder why the heck is it written in lowercase and not Type Well I guess.. of functions Since __metaclass__ can accept any callable why would you use a class since it's obviously more complicated..

Difference between __str__ and __repr__ in Python

http://stackoverflow.com/questions/1436703/difference-between-str-and-repr-in-python

has a useful repr so code like that can just work. This is why the œeval thing comes up if you have enough information so eval..

How do I download a file over HTTP using Python?

http://stackoverflow.com/questions/22676/how-do-i-download-a-file-over-http-using-python

find a way to actually down load the file in Python thus why I resorted to wget. So how do I download the file using Python..

The Python yield keyword explained

http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained

This is called duck typing and is one of the reason why Python is so cool. But this is another story for another question.....

Python 'self' explained

http://stackoverflow.com/questions/2709821/python-self-explained

specific object created from that class but I can't see why it explicitly needs to be added to every function as a parameter... everywhere it does do it for instance attributes. That's why assigning to an instance attribute needs to know what instance..

Calling a function from a string with the function's name in Python

http://stackoverflow.com/questions/3061/calling-a-function-from-a-string-with-the-functions-name-in-python

I need to get the return value of the function which is why I don't just use eval . I figured out how to do it by using..

Python “is” operator behaves unexpectedly with integers

http://stackoverflow.com/questions/306313/python-is-operator-behaves-unexpectedly-with-integers

result a 257 b 257 a is b False # what happened here why is this False 257 is 257 True # yet the literal numbers compare..

Why use pip over easy_install?

http://stackoverflow.com/questions/3220404/why-use-pip-over-easy-install

easy_install will fail. Other than cosmetic differences why do Python people like in the above tweet seem to strongly favor.. if a package is being installed pip keeps track of why that package was required. Error messages should be useful...

How do you create a daemon in Python?

http://stackoverflow.com/questions/473620/how-do-you-create-a-daemon-in-python

to be considered Is one sample better than the other and why python daemon share improve this question Sander Marechal's..

Why is python ordering my dictionary like so?

http://stackoverflow.com/questions/526125/why-is-python-ordering-my-dictionary-like-so

but it comes out the same every time and I've no idea why. python dictionary share improve this question The real..

Python rounding error with float numbers

http://stackoverflow.com/questions/5997027/python-rounding-error-with-float-numbers

for which this rounding error happens. Does anyone knows why this happens with those lucky numbers Thanks in advance. python..

Python __init__ and self what do they do?

http://stackoverflow.com/questions/625083/python-init-and-self-what-do-they-do

to be and is it mandatory What does the __init__ method do why is it necessary etc I think they might be oop constructs but..

Why are Python's 'private' methods not actually private?

http://stackoverflow.com/questions/70528/why-are-pythons-private-methods-not-actually-private

I'd always heard Python doesn't support encapsulation so why even try What gives python python 2.7 encapsulation information..

Syntax error on print with Python 3

http://stackoverflow.com/questions/826948/syntax-error-on-print-with-python-3

Python 3 I'm new to python and am currently lost as to why print is giving a syntax here. Hoping someone might be able..

What is a metaclass in Python?

http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python

class creation modify the class return the modified class Why would you use metaclasses classes instead of functions Since.. are called metaclasses damn it It must mean something Why the hell would you use metaclasses Now the big question. Why.. the hell would you use metaclasses Now the big question. Why would you use some obscure error prone feature Well usually..

Python math is wrong [duplicate]

http://stackoverflow.com/questions/11950819/python-math-is-wrong

5.1 4 1.0999999999999996 5 4 1 5.0 4.0 1.0 Why is Python getting its maths wrong python math numbers share..

Python subprocess readlines() hangs

http://stackoverflow.com/questions/12419198/python-subprocess-readlines-hangs

I assume you use pty due to reasons outlined in Q Why not just use a pipe popen all other answers so far ignore your..

Why does comparing strings in Python using either '==' or 'is' sometimes produce a different result?

http://stackoverflow.com/questions/1504717/why-does-comparing-strings-in-python-using-either-or-is-sometimes-produce

does comparing strings in Python using either ' ' or 'is' sometimes..

Why do people write #!/usr/bin/env python on the first line of a Python script?

http://stackoverflow.com/questions/2429511/why-do-people-write-usr-bin-env-python-on-the-first-line-of-a-python-script

do people write # usr bin env python on the first line of a..

Python “is” operator behaves unexpectedly with integers

http://stackoverflow.com/questions/306313/python-is-operator-behaves-unexpectedly-with-integers

is&rdquo operator behaves unexpectedly with integers Why does the following behave unexpectedly in Python a 256 b 256.. integers and the is operator can tell the difference. Why the leaky abstraction What is a better way of comparing two..

Why use pip over easy_install?

http://stackoverflow.com/questions/3220404/why-use-pip-over-easy-install

use pip over easy_install A tweet reads Don't use easy_install.. unless you like stabbing yourself in the face. Use pip. Why use pip over easy_install Doesn't the fault lie with PyPI and..

Python variable scope question

http://stackoverflow.com/questions/370357/python-variable-scope-question

This has me completely baffled for two reasons 1 Why is there an runtime error thrown at line A because of a later.. thrown at line A because of a later statement on line B 2 Why are variables a and b printed as expected while c raises an..

Why is python ordering my dictionary like so?

http://stackoverflow.com/questions/526125/why-is-python-ordering-my-dictionary-like-so

is python ordering my dictionary like so Here is the dictionary..

How do I duplicate sys.stdout to a log file in python?

http://stackoverflow.com/questions/616645/how-do-i-duplicate-sys-stdout-to-a-log-file-in-python

I thought that simply reversing the dup2's should work. Why doesn't it Here's my test import os sys ### my broken solution..

Python's use of __new__ and __init__?

http://stackoverflow.com/questions/674304/pythons-use-of-new-and-init

a1 A a2 A a3 A Outputs NEW INIT EXISTS INIT EXISTS INIT Why python design patterns class design share improve this question..

Why are Python's 'private' methods not actually private?

http://stackoverflow.com/questions/70528/why-are-pythons-private-methods-not-actually-private

are Python's 'private' methods not actually private Python..

list comprehension without [ ], Python

http://stackoverflow.com/questions/9060653/list-comprehension-without-python

str _ for _ in xrange 10 no but the result is the same. Why Does str _ for _ in xrange 10 also produce a list or an iteratable..

Why is reading lines from stdin much slower in C++ than Python?

http://stackoverflow.com/questions/9371238/why-is-reading-lines-from-stdin-much-slower-in-c-than-python

is reading lines from stdin much slower in C than Python I..