type-hinting Archives

PHP, Programming

IT Nursery

Nullable return types in PHP7

PHP 7 introduces return type declarations. Which means I can now indicate the return value is a certain class, interface, array, callable or ...

June 3, 2022
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Programming, Python

IT Nursery

Difference between defining typing.Dict and dict?

I am practicing using type hints in Python 3.5. One of my colleague uses typing.Dict: import typing def change_bandwidths(new_bandwidths: typing.Dict, user_id: int, user_name: ...

June 3, 2022
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Programming, Python

IT Nursery

Python void return type annotation

In python 3.x, it is common to use return type annotation of a function, such as: def foo() -> str: return "bar" What ...

May 30, 2022
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Programming, Python

IT Nursery

Type hint for a file or file-like object?

Is there any correct type hint to use for a file or file-like object in Python? For example, how would I type-hint the ...

May 28, 2022
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PHP, Programming

IT Nursery

Cannot pass null argument when using type hinting

The following code: class Type { } function foo(Type $t) { } foo(null); failed at run time: PHP Fatal error: Argument 1 passed ...

May 27, 2022
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PHP, Programming

IT Nursery

How to resolve “must be an instance of string, string given” prior to PHP 7?

Here is my code: function phpwtf(string $s) { echo "$s\n"; } phpwtf("Type hinting is da bomb"); Which results in this error: Catchable fatal ...

May 27, 2022
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Type hinting a collection of a specified type

Using Python 3’s function annotations, it is possible to specify the type of items contained within a homogeneous list (or other collection) for ...

May 25, 2022
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Python type hinting without cyclic imports

I’m trying to split my huge class into two; well, basically into the “main” class and a mixin with additional functions, like so: ...

May 24, 2022
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How to annotate types of multiple return values?

How do I use type hints to annotate a function that returns an Iterable that always yields two values: a bool and a ...

May 22, 2022
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How to specify “nullable” return type with type hints

Suppose I have a function: def get_some_date(some_argument: int=None) -> %datetime_or_None%: if some_argument is not None and some_argument == 1: return datetime.utcnow() else: return ...

May 16, 2022
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