python-3.4

问题 As the documentation says, an enumeration is a set of symbolic names (members) bound to unique, constant values. The PEP8 says that constants are usually named as UPPER_CASE , should I use this notation in Python 3.4 enums? If yes, why the examples in the docs are using lower_case ? 回答1: Update The BDFL (Benevolent Dictator For Life) has spoken, and the Enum documentation has changed to reflect all upper-case member names. The examples in the [previous] docs are lower-case primarily because

问题 I'm trying to extract openvpn.service status using Systemd D-Bus API. In [1]: import dbus In [2]: sysbus = dbus.SystemBus() In [3]: systemd1 = sysbus.get_object('org.freedesktop.systemd1', '/org/freedesktop/systemd1') In [4]: manager = dbus.Interface(systemd1, 'org.freedesktop.systemd1.Manager') In [5]: service = dbus.Interface(systemd1, 'org.freedesktop.systemd1.Service') In [6]: unit = dbus.Interface(systemd1, 'org.freedesktop.systemd1.Unit') In [7]: unit.ActiveState('openvpn.service') ----

问题 I'd like to generate some types at runtime from a config file. For simplity, let's assume I already have the data loaded as a python dictionary: color_values = dict(RED = 1, YELLOW = 2, GREEN = 3) How can I transform this into the type (using enum) class Color(enum.Enum): RED = 1 YELLOW = 2 GREEN = 3 The following doesn't work def make_enum(name, values): return type(name, (enum.Enum,), values) >>> Color = make_enum('Color', color_values) AttributeError: 'dict' object has no attribute '

问题 I'd like to generate some types at runtime from a config file. For simplity, let's assume I already have the data loaded as a python dictionary: color_values = dict(RED = 1, YELLOW = 2, GREEN = 3) How can I transform this into the type (using enum) class Color(enum.Enum): RED = 1 YELLOW = 2 GREEN = 3 The following doesn't work def make_enum(name, values): return type(name, (enum.Enum,), values) >>> Color = make_enum('Color', color_values) AttributeError: 'dict' object has no attribute '

问题 I am trying to make python3 executable scripts and run them from shell.I have python 3.4.0 installed on my system. So, I added '/home/spandan/python_codes' directory to PYTHONPATH , as I am planning to keep my scripts and modules here. However, while trying to execute these, the above error is thrown by the system, and the scripts wont execute unless I go into the python_codes directory and then execute them. Executing python program : Here I found out that PYTHONPATH is irrelevant while

问题 I have been successfully uploading files to a google-drive-folder with PyDrive. But, when it comes to uploading files to a folder in a google-drive-teamdrive-folder which is shared with me, the following code is not working. from pydrive.auth import GoogleAuth from pydrive.drive import GoogleDrive gauth = GoogleAuth() gauth.LocalWebserverAuth() drive = GoogleDrive(gauth) location_to_save = "D:\images" mImageLoc = location_to_save + "\\abcd.jpg" #[...Code to fetch and save the file as abcd.jpg

问题 How do I print out the index location of each of a python list so that it starts at 1, rather than 0. Here's an idea of what I want it to look like: blob = ["a", "b", "c", "d", "e", "f"] for i in blob: print(???) Output: 1 a 2 b 3 c 4 d 5 e What I need to know is how do I get those numbers to show up alongside what I'm trying to print out? I can get a-e printed out no problem, but I can't figure out how to number the list. 回答1: for a, b in enumerate(blob, 1): print '{} {}'.format(a, b) 回答2:

问题 Consider this file containing two similar functions: #include <iostream> int main() { std::cout << "main\n"; } int notmain() { std::cout << "notmain\n"; } I compiled this into a shared library: g++ -shared -Wl,-soname,code -o code.so -fPIC code.cpp I wish to call these from python, for main this works fine: import ctypes libc = ctypes.cdll.LoadLibrary("code.so") libc.main() Which prints main . However, notmain doesn't work: import ctypes libc = ctypes.cdll.LoadLibrary("code.so") libc.notmain(

问题 I have an unittest which is using multiprocessing. After upgrading from Python 3.2 to Python 3.4 I get following error. I can't find a hint, what was changed inside Python and what I have to change, to make my code running. Thanks in advance. Traceback (most recent call last): File "<string>", line 1, in <module> File "C:\Python341_64\lib\multiprocessing\spawn.py", line 106, in spawn_main exitcode = _main(fd) File "C:\Python341_64\lib\multiprocessing\spawn.py", line 116, in _main self =

问题 i'm trying to install PyCrypto for Python 3.4 but i'm having problem with the C compiled programs. it says that "error: cannot run C compiled program". anyone have an idea how to fix it?? code: running build running build_py running build_ext running build_configure checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... configure: error: in `