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How can I drop all the tables in a PostgreSQL database?
...en create) used to work on PostgreSQL 9.1. After upgrading to 9.3, the two extra grant is necessary.
– Jinghao Shi
Sep 15 '14 at 23:42
4
...
Evaluating a mathematical expression in a string
...s a class, so I can use it
more easily in other places.
'''
class NumericStringParser(object):
'''
Most of this code comes from the fourFn.py pyparsing example
'''
def pushFirst(self, strg, loc, toks):
self.exprStack.append(toks[0])
def pushUMinus(self, strg, loc, to...
Convert a Map to a POJO
...o = mapper.convertValue(map, MyPojo.class);
No need to convert into JSON string or something else; direct conversion does much faster.
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Asking the user for input until they give a valid response
... = input("Please enter your age: ")
try:
# try and convert the string input to a number
age = int(input_value)
except ValueError:
# tell the user off
print("{input} is not a number, please enter a number only".format(input=input_value))
if age >= 18:
pr...
Specifying a custom DateTime format when serializing with Json.Net
...y ARE correct, although they are not strictly necessary here. See Literal String Delimiters in the documentation for Custom Date and Time Format Strings. However, the format I quoted as the default format for the IsonDateTimeConverter was taken directly from the Json.Net source code; therefore I a...
Is the pImpl idiom really used in practice?
...ss, I would consider caution because all those benefits come at a cost: an extra level of indirection is required in order to access the implementation methods.
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Managing constructors with many parameters in Java
... Consider the following example
public class StudentBuilder
{
private String _name;
private int _age = 14; // this has a default
private String _motto = ""; // most students don't have one
public StudentBuilder() { }
public Student buildStudent()
{
return new ...
Is there a difference between “throw” and “throw ex”?
...hrow doesn't - the original offender would be preserved.
static void Main(string[] args)
{
try
{
Method2();
}
catch (Exception ex)
{
Console.Write(ex.StackTrace.ToString());
Console.ReadKey();
}
}
private static void Method2()
{
try
{
...
How can I get the named parameters from a URL using Flask?
...
Use request.args to get parsed contents of query string:
from flask import request
@app.route(...)
def login():
username = request.args.get('username')
password = request.args.get('password')
...
How to prevent line break at hyphens on all browsers
...ng but letters and digits. The reason is that some browsers may even break strings like “2/3” or “f(0)” (see my page on oddities of line breaking in browsers).
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