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How To Check If A Key in **kwargs Exists?
...to you in advance. However, if they are, here is a simple example:
import sys
def myfunc(**kwargs):
args = {'country':'England','town':'London',
'currency':'Pound', 'language':'English'}
diff = set(kwargs.keys()) - set(args.keys())
if diff:
print("Invalid args:",tu...
Check if an apt-get package is installed and then install it if it's not on Linux
I'm working on a Ubuntu system and currently this is what I'm doing:
22 Answers
22
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Testing whether a value is odd or even
... numbers are floats in JavaScript and using a bitwise operator means first converting it into an int, then performing the operation, and then converting it back to a floating point number.
– poke
Sep 25 '17 at 11:25
...
What is the difference between char array and char pointer in C?
...s provided where one of type char* is expected, the compiler automatically converts the array into a pointer to its first element.
Your example function printSomething expects a pointer, so if you try to pass an array to it like this:
char s[10] = "hello";
printSomething(s);
The compiler pretend...
Listing all permutations of a string/integer
...
Here I have found the solution. It was written in Java, but I have converted it to C#. I hope it will help you.
Here's the code in C#:
static void Main(string[] args)
{
string str = "ABC";
char[] charArry = str.ToCharArray();
Permute(charArry, 0, 2);
Console.ReadKey();
}
st...
dynamic_cast and static_cast in C++
... a class Base of which there is a derived class Derived, dynamic_cast will convert a Base pointer to a Derived pointer if and only if the actual object pointed at is in fact a Derived object.
class Base { virtual ~Base() {} };
class Derived : public Base {};
class Derived2 : public Base {};
class R...
Remove underline from links in TextView - Android
...which is the case for a basic http:// link. However, Linkify is smart and converts a phone number like (212) 555-1212 into the URL tel:2125551212. The new URLSpanNoUnderline call should be passed span.getURL() to retain this info, otherwise you generate bad links that cause exceptions when clicked...
java: HashMap not working
...foo", new Integer(3));
Auto-boxing means the first version is implicitly converted to the second. Auto-unboxing means you can write:
int i = myMap.get("foo");
instead of:
int i = myMap.get("foo").intValue();
The implicit call to intValue() means if the key isn't found it will generate a Null...
Add leading zeroes to number in Java? [duplicate]
...s, then applying it directly to the number. The format for this example is converted as follows:
%% --> %
0 --> 0
%d --> <value of digits>
d --> d
So if digits is equal to 5, the format string becomes %05d which specifies an integer with a width of 5 printing leading zeroes. S...
What is the point of a private pure virtual function?
...e);
would call void SetState( int var, int val ) from the derived class, converting true to int.
If the interface is not virtual and the virtual implementation is non-public, like in your exmaple, the author of the derived class has one less problem to think about and can simply write
class MyTu...