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author	Clifford Wolf <clifford@clifford.at>	2015-08-12 15:04:44 +0200
committer	Clifford Wolf <clifford@clifford.at>	2015-08-12 15:04:44 +0200
commit	e4ef000b703080131f4608f8bdcbe108a9b30b51 (patch)
tree	a9d2afea207bb61ceaa675326c0ea03aec7cd8d9 /tests/asicworld/code_verilog_tutorial_multiply.v
parent	c43f38c81be830469eb1536c073c519b25e18f4e (diff)
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Adjust makefiles to work with out-of-tree builds

This is based on work done by Larry Doolittle

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# Coding Conventions (Python)

Most of our style follows PEP8 with some local modifications to make things less nit-picky. 

* We target Python 3.5 for compatability with all supported platforms.
* We indent using four (4) spaces (soft tabs)
* We encourage liberal use of comments
  * Think of them as a story describing the feature
  * Use them liberally to explain why particular decisions were made.
  * Do not write obvious comments
  * If you're not sure if a comment is obvious, go ahead and include it.
* We require useful docstrings for all functions.
* In general we don't wrap lines, they can be as long as needed. If you do choose to wrap lines please do not wrap any wider than 76 columns.
* Some of our practices conflict with the wider python community to make our codebase more approachable to non-pythonistas.

# YAPF

You can use [yapf](https://github.com/google/yapf) to style your code. We provide a config in [setup.cfg](setup.cfg).

# Imports

We don't have a hard and fast rule for when to use `import ...` vs `from ... import ...`. Understandability and maintainability is our ultimate goal.

Generally we prefer to import specific function and class names from a module to keep code shorter and easier to understand. Sometimes this results in a name that is ambiguous, and in such cases we prefer to import the module instead. You should avoid using the "as" keyword when importing, unless you are importing a compatability module.

Imports should be one line per module. We group import statements together using the standard python rules- system, 3rd party, local.

Do not use `from foo import *`. Supply a list of objects you want to import instead, or import the whole module.

## Import Examples

Good:

```
from qmk import effects

effects.echo()
```

Bad:

```
from qmk.effects import echo

echo()  # It's unclear where echo comes from
```

Good:

```
from qmk.keymap import compile_firmware

compile_firmware()
```

OK, but the above is better:

```
import qmk.keymap

qmk.keymap.compile_firmware()
```

# Statements

One statement per line.

Even when allowed (EG `if foo: bar`) we do not combine 2 statements onto a single line.

# Naming

`module_name`, `package_name`, `ClassName`, `method_name`, `ExceptionName`, `function_name`, `GLOBAL_CONSTANT_NAME`, `global_var_name`, `instance_var_name`, `function_parameter_name`, `local_var_name`.


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