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Vamei Source: Http://www.cnblogs.com/vamei Welcome reprint, Please also keep this statement. Thank you!Python's standard library is a powerful force for Python, as we've already described in the previous article. Because the standard library involves a wide range of applications, it is necessary to learn some background knowledge.Hardware principlesThis part need
locally, memory overhead is particularly large.Value of K:The value of the parameter k is generally not greater than 20. --"machine learning Combat"2. Handwriting Recognition ExampleKNN algorithm is mainly applied to text classification and similarity recommendation. This article will describe an example of a classification, an example in the book "Machine Learning Combat", using the
python is an object-oriented, interpretive computer programming language with a rich and powerful library, coupled with its simplicity, ease of learning, speed, open source free, portability, extensibility, and object-oriented features,python Become the most popular programming language of the 2017! AI is one of the h
learning with Scikit-learnBooks:
"Ten minutes to Pandas" Chinese translation version: http://www.cnblogs.com/chaosimple/p/4153083.html
Founder of Pandas: Data analysis using Python (watercress) (recommend)
The collection of textbooks: Scipy lecture Notes (very good writing!) Regret missing Pandas)
Improve yourself: machine learning combat (w
Theano is a Python library that can run fast numerical computations on a CPU or GPU. This is a key base in python depth learning, and you can use it directly to create a deep learning model or a wrapper library that simplifies the
Think about so many years, but also did not well comb their knowledge system, so that there will always be a book to time to hate less regret.Recently, since there is the motivation to learn, simply take advantage of this job is not particularly busy opportunities, write a little things, but also the logic of their own ability to think.What libraries do python have?This question can be referred to http://blog.csdn.net/python_wangjunji/article/details/
/mozilla '] ㈤ pipeline [python] >>> Print (Sh.sort (Sh.du (Sh.glob (' * '), '-SHC '), '-rn ') 712k distribute-0.6.49.tar.gz 672k setuptools-1.1.5.tar.gz 548k get-pip.py Pipeline is ordered, by default from the inside out, but what if parallelism is required? Add a _piped=true[python] >>> for line in sh.tr (Sh.tail ("-F", "/home/mysql/mysql/log/alert.log", _ piped=true), "[: Upper:]", "[: Lower:]", _it
') -Plt.plot (x2,y,linestyle='-', label='Linear') +Plt.plot (X2,y2,'-', lw=2,label='Cubic') - plt.legend () +Plt.show ()Summary:For this book ("NumPy Study Guide") learning to this is over, because NumPy for the special status of Python, for her familiarity with the learning process will inevitably accompany my remaining life is quite a long part, so there is no
()) Save the above program as a py_id.py file, using $python py_id.py and $sudo python py_id.py to see the results of the operationSaved UID and saved GIDWhen we write a Python script, we actually run the Python interpreter instead of the Python script file.Run the executio
The NumPy library is a standalone module of the Python development environment, and most Python distributions do not have the NumPy library installed by default, so you must install the NumPy library separately after you install Python
BeautifulSoup:(scrapingenv) ryan$ pip install Beautifulsoup4(scrapingenv) ryan$ python> from BS4 import beautifulsoup>When you no longer use a library in a virtual environment, you can exit the environment by releasing the command:(scrapingenv) ryan$ deactivateryan$ python> from BS4 import beautifulsoupTraceback (most recent):File "Importerror:no module named '
1. Beautiful Soup Introduction
Beautiful Soup is a python library that parses data from HTML and XML files to provide a customary way to traverse the search and modify the parse tree, which greatly reduces the time it takes to run the crawler.
Beautiful soup automatically converts the input document to Unicode encoding, and the output document is converted to UTF-8 encoding. You don't have to think a
Python Utility library: prettytable Learning
Prettytable description
Prettytable is a third-party library in Python that can be used to generate beautiful, ASCII-formatted tables that are useful.The following is an official introduction:
A Simple
include a lock object (since condition variable is always used with the mutex).The ability to invoke the acquire () and release () methods on the condition object to control the potential lock object.Wait () methodEquivalent to Cond_wait ()Notify_all ()Quite with Cond_broadcast ()Nofify ()Similar to the Notify_all () feature, but only wakes up a waiting thread, not allThreading. Semaphore ObjectSemaphore, which is the count lock.When you create an object. Ability to pass an integer as the upper
/max/resolution2) Instance attributes (read-only)Attribute ValueDays Between-999999999 and 999999999 inclusiveSeconds between 0 and 86399 inclusivemicroseconds between 0 and 999999 inclusive3) Instance MethodsTimedelta.total_seconds ()Five, Tzinfo Objects (temporarily do not write, see later)六、一个 Little Practice‘‘‘Give two recognizable dates and calculate the number of days between two date intervals.Input: STR1,STR2 format is YYYY/MM/DD, as in 2013/08/06, no validation required for entryreturn:
scenario.In the following example, our use of the manager is similar to shared memory, but we can share a richer object type.Import multiprocessing def f (x, arr, L): x.value = 3.14 arr[0] = 5 l.append (' Hello ') server = multiprocessing. Manager () x = server. Value (' d ', 0.0) arr = server. Array (' I ', Range (Ten)) L = server.list () proc = multiprocessing. Process (Target=f, args= (x, arr, L)) Proc.start () Proc.join () print (x.value) print (arr) print (L)The manager use
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