python - python中的编译指示

Question

我正在阅读 bottle.py 源代码。它是一个 Web 框架，只有 3000 多行 Python 代码。太酷了。

我发现了一些这样的代码:

class ServerAdapter(object):
    quiet = False
    def __init__(self, host='127.0.0.1', port=8080, **config):
        self.options = config
        self.host = host
        self.port = int(port)

    def run(self, handler): # pragma: no cover
        pass
    ... 

# pragma: no cover 是什么意思？我在 python 文档中找不到任何关于 pragma 语法的介绍。

Answer 1

显然与 coverage.py 有关:

Coverage.py is a tool for measuring code coverage of Python programs. It monitors your program, noting which parts of the code have been executed, then analyzes the source to identify code that could have been executed but was not.

确切的 # pragma: no cover 提示该工具应忽略该部分代码 -- 参见 Excluding code from coverage .