If you’re running a recent-ish version of pandas then you can use the datetime accessor dt to access the datetime components: In [6]: df[‘date’] = pd.to_datetime(df[‘date’]) df[‘year’], df[‘month’] = df[‘date’].dt.year, df[‘date’].dt.month df Out[6]: date Count year month 0 2010-06-30 525 2010 6 1 2010-07-30 136 2010 7 2 2010-08-31 125 2010 8 3 2010-09-30 84 … Read more
Using list comprehension: >>> lst = [[‘a’,’b’,’c’], [1,2,3], [‘x’,’y’,’z’]] >>> lst2 = [item[0] for item in lst] >>> lst2 [‘a’, 1, ‘x’]
A faster and easier-to-understand filter that accomplishes the same thing: git filter-branch –index-filter ‘ git read-tree –empty git reset $GIT_COMMIT — $your $files $here ‘ \ — –all — $your $files $here
>>> import numpy as np >>> A = np.array([[1,2,3,4],[5,6,7,8]]) >>> A array([[1, 2, 3, 4], [5, 6, 7, 8]]) >>> A[:,2] # returns the third columm array([3, 7]) See also: “numpy.arange” and “reshape” to allocate memory Example: (Allocating a array with shaping of matrix (3×4)) nrows = 3 ncols = 4 my_array = numpy.arange(nrows*ncols, dtype=”double”) … Read more
SimpleXML cannot handle comments, but the DOM extension can. Here’s how you can extract all the comments. You just have to adapt the XPath expression to target the node you want. $doc = new DOMDocument; $doc->loadXML( ‘<doc> <node><!– First node –></node> <node><!– Second node –></node> </doc>’ ); $xpath = new DOMXPath($doc); foreach ($xpath->query(‘//comment()’) as $comment) … Read more
I just use URI.js — makes it easy. var source = “Hello www.example.com,\n” + “http://google.com is a search engine, like http://www.bing.com\n” + “http://exämple.org/foo.html?baz=la#bumm is an IDN URL,\n” + “http://123.123.123.123/foo.html is IPv4 and ” + “http://fe80:0000:0000:0000:0204:61ff:fe9d:f156/foobar.html is IPv6.\n” + “links can also be in parens (http://example.org) ” + “or quotes »http://example.org«.”; var result = URI.withinString(source, function(url) … Read more
Readability mainly consists of heuristics that “just somehow work well” in many cases. I have written some research papers about this topic and I would like to explain the background of why it is easy to come up with a solution that works well and when it gets hard to get close to 100% accuracy. … Read more
There is a string function (strtok) which can be used to split a string into smaller strings (tokens) based on some separator(s). For the purposes of this thread, the first word (defined as anything before the first space character) of Test me more can be obtained by tokenizing the string on the space character. <?php … Read more
Use a map with word as a key and count as value, somthing like this Map<String, Integer> map = new HashMap<>(); for (String w : words) { Integer n = map.get(w); n = (n == null) ? 1 : ++n; map.put(w, n); } if you are not allowed to use java.util then you can sort … Read more
Create an element, store the HTML in it, and get its textContent: function extractContent(s) { var span = document.createElement(‘span’); span.innerHTML = s; return span.textContent || span.innerText; }; alert(extractContent(“<p>Hello</p><a href=”http://w3c.org”>W3C</a>”)); Here’s a version that allows you to have spaces between nodes, although you’d probably want that for block-level elements only: function extractContent(s, space) { var span= … Read more