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How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?
... dictionaries x and y, z becomes a shallowly merged dictionary with values from y replacing those from x.
In Python 3.5 or greater:
z = {**x, **y}
In Python 2, (or 3.4 or lower) write a function:
def merge_two_dicts(x, y):
z = x.copy() # start with x's keys and values
z.update(y) # m...
php execute a background process
... script in whatever language (php/bash/perl/etc) is handy and then call it from the process control functions in your php script.
The function probably detects if standard io is used as the output stream and if it is then that will set the return value..if not then it ends
proc_close( proc_open( ...
Is there a “do … while” loop in Ruby?
...rs to tell
begin <code> end while <cond>
works differently from
<code> while <cond>
RosettaCode wiki has a similar story:
During November 2005, Yukihiro Matsumoto, the creator of Ruby, regretted this loop feature and suggested using Kernel#loop.
...
How can I maintain fragment state when added to the back stack?
...tten up a dummy activity that switches between two fragments. When you go from FragmentA to FragmentB, FragmentA gets added to the back stack. However, when I return to FragmentA (by pressing back), a totally new FragmentA is created and the state it was in is lost. I get the feeling I'm after th...
How do I find out my python path using python?
...d out which directories are listed in my system’s PYTHONPATH variable, from within a Python script (or the interactive shell)?
...
What do the following phrases mean in C++: zero-, default- and value-initialization?
...fication). See Kirill V. Lyadvinsky's answer for the definitions straight from the standard.
See this previous answer about the behavior of operator new for details on the the different behavior of these type of initialization and when they kick in (and when they differ from c++98 to C++03):
Do ...
How to remove duplicate values from an array in PHP
How can I remove duplicate values from an array in PHP?
24 Answers
24
...
How do I handle the window close event in Tkinter?
...Toplevel widget):
Here you have a concrete example:
import tkinter as tk
from tkinter import messagebox
root = tk.Tk()
def on_closing():
if messagebox.askokcancel("Quit", "Do you want to quit?"):
root.destroy()
root.protocol("WM_DELETE_WINDOW", on_closing)
root.mainloop()
...
MySql server startup error 'The server quit without updating PID file '
...
From my own experience - Be careful that after you've done the sudo chown that you don't currently have some mysql processes running under another user or root. ps -ef | grep mysql will validate that you have nothing running ...
Install a .NET windows service without InstallUtil.exe
...ce.
Running Reflector on ServiceInstaller can fill in the details missing from this brief explanation.
P.S. Clearly this won't have "the same effect as calling: InstallUtil MyService.exe" - in particular, you won't be able to uninstall using InstallUtil. But it seems that perhaps this wasn't an ac...