大约有 4,400 项符合查询结果（耗时：0.0282秒） [XML]
Change the name of a key in dictionary
...
In python 2.7 and higher, you can use dictionary comprehension:
This is an example I encountered while reading a CSV using a DictReader. The user had suffixed all the column names with ':'
ori_dict = {'key1:' : 1, 'key2:' : 2, 'key3:'...
How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?
...
Similarly, taking the union of items() in Python 3 (viewitems() in Python 2.7) will also fail when values are unhashable objects (like lists, for example). Even if your values are hashable, since sets are semantically unordered, the behavior is undefined in regards to precedence. So don't do this:
...
Options for HTML scraping? [closed]
...brary has a built-in HTML Parser... why not just use that? docs.python.org/2.7/library/htmlparser.html
– ArtOfWarfare
Jul 20 '15 at 20:29
add a comment
|
...
Creating a new dictionary in Python
...
@ Matt Apparently CPython 2.7 dict() is slower (6 times slower?), See: doughellmann.com/2012/11/… In any case I am starting to prefer the constructor syntax anyways since I find it easier to type and move code between dicts and function calls.
...
How to find if directory exists in Python
...ue
In [8]: q.is_dir()
Out[8]: False
Pathlib is also available on Python 2.7 via the pathlib2 module on PyPi.
share
|
improve this answer
|
follow
|
...
搭建高可用mongodb集群（四）—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...p /data/mongodbtest
#进入mongodb文件夹
cd /data/mongodbtest
3、下载mongodb的安装程序包
wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.4.8.tgz
#解压下载的压缩包
tar xvzf mongodb-linux-x86_64-2.4.8.tgz
4、分别在每台机器建立mongos 、config ...
How would you make a comma-separated string from a list of strings?
...
Note if you are using python 2.7 (which you shouldn't by now) then using str will raise an exception if any item in the list has unicode.
– kroiz
May 26 at 13:54
...
cv2.imshow command doesn't work properly in opencv-python
I'm using opencv 2.4.2, python 2.7
The following simple code created a window of the correct name, but its content is just blank and doesn't show the image:
...
Issue with virtualenv - cannot activate
...
I don't see this "venv" directory after installing Python 2.7 on Windows. Advice? I went to Blairg23's link, but do not see an "activate" script in my Python "Scripts" directory.
– ryanwebjackson
Oct 3 '17 at 2:16
...
Why is the order in dictionaries and sets arbitrary?
...d 'bar', for example, and lets assume the table size is 8 slots. In Python 2.7, hash('foo') is -4177197833195190597, hash('bar') is 327024216814240868. Modulo 8, that means these two keys are slotted in slots 3 and 4 then:
>>> hash('foo')
-4177197833195190597
>>> hash('foo') % 8
3...