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TypeError: method() takes 1 positional argument but 2 were given
...
In Python, this:
my_object.method("foo")
...is syntactic sugar, which the interpreter translates behind the scenes into:
MyClass.method(my_object, "foo")
...which, as you can see, does indeed have two arguments - it's just that the first one is implicit, ...
How can I read a function's signature including default argument values?
...
import inspect
def foo(a, b, x='blah'):
pass
print(inspect.getargspec(foo))
# ArgSpec(args=['a', 'b', 'x'], varargs=None, keywords=None, defaults=('blah',))
However, note that inspect.getargspec() is deprecated since Python 3.0.
Python ...
C pointers : pointing to an array of fixed size
...such an array to a function is by using a pointer-to-array parameter
void foo(char (*p)[10]);
(in C++ language this is also done with references
void foo(char (&p)[10]);
).
This will enable language-level type checking, which will make sure that the array of exactly correct size is suppli...
How can I remove all objects but one from the workspace in R?
... a lot of objects with the same pattern that you don't want to keep:
> foo1 <- "junk"; foo2 <- "rubbish"; foo3 <- "trash"; x <- "gold"
> ls()
[1] "foo1" "foo2" "foo3" "x"
> # Let's check first what we want to remove
> ls(pattern = "foo")
[1] "foo1" "foo2" "foo3"
> rm...
What is the difference between mocking and spying when using Mockito?
... a real object but you have a possibility to mock it
class A {
String foo1() {
foo2();
return "RealString_1";
}
String foo2() {
return "RealString_2";
}
void foo3() {
foo4();
}
void foo4() {
}
}
@Test
public void testMockA() {
...
What is the formal difference in Scala between braces and parentheses, and when should they be used?
...tod calls you should use the dot and parentheses.
val result = myInstance.foo(5, "Hello")
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Ruby send vs __send__
...ss being manipulated defines. It could have overriden send.
Watch:
class Foo
def bar?
true
end
def send(*args)
false
end
end
foo = Foo.new
foo.send(:bar?)
# => false
foo.__send__(:bar?)
# => true
If you override __send__, Ruby will emit a warning:
warning: redefining ...
Coding Practices which enable the compiler/optimizer to make a faster program
...ng slowdowns. For example, if your code looks like
void DoSomething(const Foo& foo1, const Foo* foo2, int numFoo, Foo& barOut)
{
for (int i=0; i<numFoo, i++)
{
barOut.munge(foo1, foo2[i]);
}
}
the compiler doesn't know that foo1 != barOut, and thus has to reload fo...
What's the difference between console.dir and console.log?
...earest example of a difference is a regular expression:
> console.log(/foo/);
/foo/
> console.dir(/foo/);
* /foo/
global: false
ignoreCase: false
lastIndex: 0
...
You can also see a clear difference with arrays (e.g., console.dir([1,2,3])) which are logged differently from ...
How to get “wc -l” to print just the number of lines without file name?
...unt; for line count you'd do wc -l. echo -n omits the trailing line break.
FOO="bar"
echo -n "$FOO" | wc -c # " 3" (x)
echo -n "$FOO" | wc -c | bc # "3" (√)
echo -n "$FOO" | wc -c | tr -d ' ' # "3" (√)
echo -n...