Here’s a Python 3 script that returns a tuple containing an image height and width for .png, .gif and .jpeg without using any external libraries (i.e., what Kurt McKee referenced). It should be relatively easy to transfer it to Python 2. import struct import imghdr def get_image_size(fname): ”’Determine the image type of fhandle and return its … Read more
__main__.__file__ doesn’t exist in the interactive interpreter: import __main__ as main print hasattr(main, ‘__file__’) This also goes for code run via python -c, but not python -m.
Take a look at the following info from PEP 328: Relative imports use a module’s __name__ attribute to determine that module’s position in the package hierarchy. If the module’s name does not contain any package information (e.g. it is set to ‘__main__’) then relative imports are resolved as if the module were a top level … Read more
The changelog is sloppily worded. from __future__ import absolute_import does not care about whether something is part of the standard library, and import string will not always give you the standard-library module with absolute imports on. from __future__ import absolute_import means that if you import string, Python will always look for a top-level string module, … Read more
So, it’s 2016 😉 and we have Python 3.4+ with built-in asyncio module for asynchronous I/O. We can use aiohttp as HTTP client to download multiple URLs in parallel. import asyncio from aiohttp import ClientSession async def fetch(url): async with ClientSession() as session: async with session.get(url) as response: return await response.read() async def run(loop, r): … Read more
Here’s a python 3 script that returns a tuple containing an image height and width for .png, .gif and .jpeg without using any external libraries (ie what Kurt McKee referenced above). Should be relatively easy to transfer it to Python 2. import struct import imghdr def get_image_size(fname): ”’Determine the image type of fhandle and return … Read more
Use osx$ port select –list python to list your available Python installations. Then use the “–set” option to “port select” to set the port you wish to use. osx$ sudo port select –set python python27
input reads and evaluates a Python expression. When it tries to evaluate it, it looks for a variable e, which is not defined, and fails. You almost always want to use raw_input instead. (And in Python3, input has this behaviour.) Or, better, on Unix, use readline so the user can edit their input.
Use the key argument for sorted(). It lets you specify a function that, given the actual item being sorted, returns a value that should be sorted by. If this value is a tuple, then it sorts like tuples sort – by the first value, and then by the second value. sorted(your_list, key=lambda x: (your_dict[x][‘downloads’], your_dict[x][‘date’]))
Change your code to this and I think it’ll explain things (presumably super is looking at where, say, B is in the __mro__?): class A(object): def __init__(self): print “A init” print self.__class__.__mro__ class B(A): def __init__(self): print “B init” print self.__class__.__mro__ super(B, self).__init__() class C(A): def __init__(self): print “C init” print self.__class__.__mro__ super(C, self).__init__() class … Read more