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Remove the last line from a file in Bash
... means output lines starting at line 2.
Do not use sed for deleting lines from the top or bottom of a file -- it's very very slow if the file is large.
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In Python, how do I determine if an object is iterable?
.... Based on that my conclusion is that nowadays this is the best approach:
from collections.abc import Iterable # drop `.abc` with Python 2.7 or lower
def iterable(obj):
return isinstance(obj, Iterable)
The above has been recommended already earlier, but the general consensus has been that ...
Fast permutation -> number -> permutation mapping algorithms
...se of the number and k the index of the digit. (I will always count digits from the right and starting at index 0 for the rightmost digit. Likewise when I talk about the 'first' digit I mean the rightmost.)
The reason why the weights for digits follow this pattern is that the highest number that ca...
How to iterate through two lists in parallel?
... to update your answer to explicitly state that zip and zip-like functions from itertools accept any number of iterables and not just 2? This question is canonical now and your answer is the only one worth updating.
– vaultah
Jul 11 '16 at 15:01
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JS Client-Side Exif Orientation: Rotate and Mirror JPEG Images
...efore actually uploading it. The demo does neither. It simply takes a file from a file input and displays it the right way, when is this useful in the real world? When I parse my page and feed the URLs from the image tags into the loadImage library there is no exif data so can't do that. For the upl...
Should I use a class or dictionary?
...lass. You could also use a namedtuple for a hybrid approach:
>>> from collections import namedtuple
>>> request = namedtuple("Request", "environ request_method url_scheme")
>>> request
<class '__main__.Request'>
>>> request.environ = "foo"
>>> requ...
Saving and loading objects and using pickle
... further data to read. You have to rewind the file so that it will be read from the beginning again:
file.seek(0)
What you usually want to do though, is to use a context manager to open the file and read data from it. This way, the file will be automatically closed after the block finishes execut...
Apache .htaccess 禁止访问某目录方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
....htaccess文件中添加一下两行代码。
order allow,deny
deny from all
(可以把all换成某一ip地址)最简单方法，在所要禁止的目录中的.htaccess文件中添加一下两行代码。
order allow,deny
deny from all
(可以把all换成某一ip地址)
【.htaccess...
How to get the return value from a thread in python?
...eturns a string 'foo' . How can I get the value 'foo' which is returned from the thread's target?
20 Answers
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How to return an array from JNI to Java?
...sed of an 'Object' array creating with the JNI function NewObjectArray(). From the perspective of JNI, that's all a two dimensional array is, an object array containing a number of other inner arrays.
The following for loop creates the inner arrays which are of type int[] using the JNI function ...