bash: syntax error near unexpected token `(‘ – Python
add #!/usr/bin/env python at the top of your script, or call your script using python myscript.py
syntax
Is ‘const’ necessary in function parameters when passing by value? [duplicate]
First, it’s just an implementation detail, and if you put const there, don’t put it in the declaration set (header). Only put it in the implementation file: // header void MyFunction(int age, House &purchased_house); // .cpp file void MyFunction(const int age, House &purchased_house); { … } Whether or not a parameter is const in a … Read more
How do struct{} and struct{}{} work in Go?
struct is a keyword in Go. It is used to define struct types, which is a sequence of named elements. For example: type Person struct { Name string Age int } The struct{} is a struct type with zero elements. It is often used when no information is to be stored. It has the benefit … Read more
Does the extra comma at the end of a dictionary, list or set has any special meaning in Python?
It has no special meaning in a list or dictionary, but can be useful when using source code change management tools, see below. Non-empty tuples are defined by using a comma between elements, the parentheses are optional and only required in contexts where the comma could have a different meaning. Because the comma defines the … Read more
What is the difference between [ ] and ( ) brackets in Racket (lisp programming language)?
According to the Racket documentation, there is no difference — there is only a convention to use [ and ] for cond clauses (and use your judgement for the rest, as far as I understand): The use of square brackets for cond clauses is a convention. In Racket, parentheses and square brackets are actually interchangeable, … Read more
Can I set svelte style css attribute values using variables passed in to a component
No. Component styles are shared between all instances of a component, either because they’re statically extracted to a .css file, or because they’re injected into a single <style> element that all components reference. If it were possible to put variables directly inside the component’s <style>, it would mean that Svelte would need to create encapsulated … Read more
In Java, how do I access the outer class when I’m not in the inner class?
The bytecode of the Outer$Inner class will contain a package-scoped field named this$0 of type Outer. That’s how non-static inner classes are implemented in Java, because at bytecode level there is no concept of an inner class. You should be able to read that field using reflection, if you really want to. I have never … Read more
Where in the standard are functions returning functions disallowed?
From [dcl.fct], pretty explicitly: Functions shall not have a return type of type array or function, although they may have a return type of type pointer or reference to such things. There shall be no arrays of functions, although there can be arrays of pointers to functions. With C++11, you probably just want: std::function<int()> f(); … Read more
How can I write an empty indented block in Python?
Just write pass as in try: # Do something illegal. … except: # Pretend nothing happened. pass EDIT: @swillden brings up a good point, viz., this is a terrible idea in general. You should, at the least, say except TypeError, DivideByZeroError: or whatever kinds of errors you want to handle. Otherwise you can mask bigger … Read more