我使用Homebrew在Mac OS X上安装了Python
$ brew install python
然后我尝试使用pip进行更新但得到错误:
$ which python
/usr/local/bin/python
$ python --version
Python 2.7.5
$ pip --version
pip 1.5.4 from /usr/local/Cellar/python/2.7.6_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pip-1.5.4-py2.7.egg (python 2.7)
$ pip install --upgrade distribute
Downloading/unpacking distribute
Downloading distribute-0.7.3.zip (145kB): 145kB downloaded
Running setup.py (path:/private/var/folders/87/wkgwm0754tn9csz8295qjmmc000bxz/T/pip_build_bdkk/distribute/setup.py) egg_info for package distribute
Downloading/unpacking setuptools>=0.7 from https://pypi.python.org/packages/3.4/s/setuptools/setuptools-3.4.4-py2.py3-none-any.whl#md5=46284205a95cf3f9e132bbfe569e1b9d (from distribute)
Downloading setuptools-3.4.4-py2.py3-none-any.whl (545kB): 545kB downloaded
Installing collected packages: setuptools, distribute
Found existing installation: setuptools 3.4.1
Uninstalling setuptools:
Successfully uninstalled setuptools
Rolling back uninstall of setuptools
Cleaning up...
Exception:
Traceback …在 Git 中，命令返回的典型结果git ls-files -s行如下所示
100755 be2c2e9b0966253096472d4b482c458bc892e493 0 .gitignore
这些字段是什么意思？
我正在处理一个很长的 Jupyter 笔记本，由于某种原因我不得不关闭它并重新启动。之后，我想运行我正在处理的行之前的所有代码。有没有方便的方法来做到这一点？
如何获得(正确和/或可读的价值)std::numeric_limits<char>::min()？
cout << std::numeric_limits<char>::min() << endl;
cout << std::numeric_limits<char>::max() << endl;
返回
?
// some character that can't be copied here, it looks like a rectangle containing four numbers in it
在Matlab中,可以使用以下命令访问数组的列::
>> array=[1 2 3; 4 5 6]
array =
1 2 3
4 5 6
>> array(:,2)
ans =
2
5
如何在Python中执行此操作？
>>> array=[[1,2,3],[4,5,6]]
>>> array[:,2]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: list indices must be integers, not tuple
>>> array[:][2]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
我想要一个应用于大于三的维度数组的示例:
>> B = cat(3, eye(3), ones(3), magic(3))
B(:,:,1) =
1 0 0
0 1 0
0 0 …else:这个Python程序中是否正确/必要？
from random import randrange
for n in range(10):
r = randrange(0,10) # get random int in [0,10)
if n==r: continue # skip iteration if n=r
if n>r: break # exit the loop if n>r
print n
else:
print "wow, you are lucky!\n"
if n<9:
print "better luck next time\n
$ hg pull
Password:
pulling from ssh://foo@bar.com:22//home/usr/xxx/repo
searching for changes
adding changesets
adding manifests
adding file changes
然后继续显示上述情况10分钟以上.有没有办法告诉进展以及它是否仍然存在或已经死亡？
如何理解Haskell的"1.2%3.4"的错误消息？
Prelude> :m +Data.Ratio
Prelude Data.Ratio> 4.3 % 1.2
<interactive>:11:1:
No instance for (Show a0) arising from a use of ‘print’
The type variable ‘a0’ is ambiguous
Note: there are several potential instances:
instance Show Double -- Defined in ‘GHC.Float’
instance Show Float -- Defined in ‘GHC.Float’
instance (Integral a, Show a) => Show (Ratio a)
-- Defined in ‘GHC.Real’
...plus 23 others
In a stmt of an interactive GHCi command: print it
Prelude Data.Ratio>
根据http://www.mathworks.com/help/matlab/matlab_env/stop-execution.html,Ctrl + C不能很好地停止执行长时间运行的文件,或调用内置函数或MEX - 运行很长时间的文件.这是为什么？我想更多地了解潜在的原因,然后只是对我的期望的肤浅描述.另外,替代Cmd +.和Ctrl + Break真的更好吗？为什么？