如何在代码内使用python coverage [英] How to use python coverage inside the code

问题描述

我想从代码内部捕获内容。我尝试了一个以下但出现错误。请参阅以下链接以获取Coverage API。
https://coverage.readthedocs.io/ zh_cn / v4.5.x / api.html＃api

I want to capture the coverage from inside the code. I tried below one but getting error. Referred to below link for coverage API. https://coverage.readthedocs.io/en/v4.5.x/api.html#api

import os
import pandas as pd
import sys
import requests
import xml.etree.ElementTree as ET
from xml.dom import minidom
import coverage

cov = coverage.Coverage()
cov.start()

#actual code

cov.stop()
cov.save()

cov.html_report(directory='covhtml')

得到以下错误

CoverageException                         Traceback (most recent call last)
<ipython-input-15-2047badbbd57> in <module>()
     48 cov.save()
     49 
---> 50 cov.html_report(directory='covhtml')

C:\Users\\Anaconda2\lib\site-packages\coverage\control.pyc in html_report(self, morfs, directory, ignore_errors, omit, include, extra_css, title, skip_covered)
   1093             )
   1094         reporter = HtmlReporter(self, self.config)
-> 1095         return reporter.report(morfs)
   1096 
   1097     def xml_report(

C:\Users\\Anaconda2\lib\site-packages\coverage\html.pyc in report(self, morfs)
    137 
    138         # Process all the files.
--> 139         self.report_files(self.html_file, morfs, self.config.html_dir)
    140 
    141         if not self.all_files_nums:

C:\Users\\Anaconda2\lib\site-packages\coverage\report.pyc in report_files(self, report_fn, morfs, directory)
     81 
     82         if not file_reporters:
---> 83             raise CoverageException("No data to report.")
     84 
     85         self.directory = directory

CoverageException: No data to report.

推荐答案

如果将 #actual代码的内容包装在函数中，则它将起作用。这是一个（最小的）示例：

If you wrap whatever you have for #actual code in a function, then it will work. Here's a (minimalish) example:

import coverage

def test_it(x):
    return x + 1

cov = coverage.Coverage()
cov.start()

test_it(123)

cov.stop()
cov.save()

cov.html_report(directory='covhtml')

但是，如果您要替换 test_it（123）内联语句（例如 x = 123; x + = 1; print（x）），那么coverage模块将失败。

However, if you would replace test_it(123) by just doing some inline statement (like x = 123; x += 1; print(x)), then the coverage module will fail.

它已经很好地隐藏了，但是文档确实解释了此行为：

It's well hidden, but the docs do explain this behavior:

start（）

start()

开始测量代码覆盖率。

覆盖率测量仅在调用start（）
之后调用的函数中进行。

一旦您调用start（），最终您还必须调用stop（），否则您的
进程可能无法完全关闭。

Once you invoke start(), you must also call stop() eventually, or your process might not shut down cleanly.

强调一下我自己的内容，这里是链接： https://coverage.readthedocs.io/zh-CN/v4.5。 x / api_coverage.html＃coverage.Coverage.start

Emphasis my own, here's the link: https://coverage.readthedocs.io/en/v4.5.x/api_coverage.html#coverage.Coverage.start

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