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What is process.env.PORT in Node.js?
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if you run node index.js ,Node will use 3000
If you run PORT=4444 node index.js, Node will use process.env.PORT which equals to 4444 in this example. Run with sudo for ports below 1024.
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How to write DataFrame to postgres table?
...rt/database')
df.head(0).to_sql('table_name', engine, if_exists='replace',index=False) #truncates the table
conn = engine.raw_connection()
cur = conn.cursor()
output = io.StringIO()
df.to_csv(output, sep='\t', header=False, index=False)
output.seek(0)
contents = output.getvalue()
cur.copy_from(out...
How can I strip HTML tags from a string in ASP.NET?
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If it is just stripping all HTML tags from a string, this works reliably with regex as well. Replace:
<[^>]*(>|$)
with the empty string, globally. Don't forget to normalize the string afterwards, replacing:
[\s\r\n]+
with a single spa...
Base64 encoding in SQL Server 2005 T-SQL
...p/scptutl/sa306.htm
so has this method:
http://www.vbforums.com/showthread.php?t=554886
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select * vs select column
...ven when the set of columns requested are a subset of those stored in some index, the query processor must fetch every column stored in that index, not just the ones requested, for the same reasons - ALL I/O must be done in pages, and index data is stored in IO Pages just like table data. So if you...
Convert pandas dataframe to NumPy array
...taining NumPy arrays from pandas objects:
to_numpy(), which is defined on Index, Series, and DataFrame objects, and
array, which is defined on Index and Series objects only.
If you visit the v0.24 docs for .values, you will see a big red warning that says:
Warning: We recommend using DataFrame.to...
Insert a string at a specific index
How can I insert a string at a specific index of another string?
18 Answers
18
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Why should hash functions use a prime number modulus?
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tl;dr
index[hash(input)%2] would result in a collision for half of all possible hashes and a range of values. index[hash(input)%prime] results in a collision of <2 of all possible hashes. Fixing the divisor to the table size a...
Remove element of a regular array
...'t want to use List:
var foos = new List<Foo>(array);
foos.RemoveAt(index);
return foos.ToArray();
You could try this extension method that I haven't actually tested:
public static T[] RemoveAt<T>(this T[] source, int index)
{
T[] dest = new T[source.Length - 1];
if( index &g...
Create an array with same element repeated multiple times
...f the entries up front, with arr = new Array(len);, then assign to them by index in the loop, i.e. arr[i] = value;. That way you only pay O(n) rather than having to keep reallocating the array as it grows. In general, it's always better to avoid growing arrays by appending when possible. If you k...