pytest命令行参数：tb的使用

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本文详细介绍了如何使用pytest的--tb=style参数来优化报错信息的显示方式，包括no、line、short、auto、long和native六种模式，帮助开发者更高效地定位和解决问题。

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前言

pytest 使用命令行执行用例的时候，有些用例执行失败的时候，屏幕上会出现一大堆的报错内容，不方便快速查看是哪些用例失败。--tb=style 参数可以设置报错的时候回溯打印内容，可以设置参数(auto/long/short/line/native/no)

—tb=style

pytest -h 查看命令行参数，关于 --tb=style 参数的使用方式

>pytest -h

 --tb=style            traceback print mode (auto/long/short/line/native/no).

style 的值可以设置6种打印模式：auto/long/short/line/native/no

—tb=no

先写个简单的pytest用例，让他断言报错



def test_01():
    result = "hello"
    expected = "world"
    assert result == expected

命令行执行pytest test_tb.py 此时屏幕上会显示整个用例的回溯信息

test_tb.py F                                                             [100%]

================================== FAILURES ===================================
___________________________________ test_01 ___________________________________

    def test_01():
        result = "hello"
        expected = "world"
>       assert result == expected
E       AssertionError: assert "hello" == "world"
E         - hello
E         + world

test_tb.py:8: AssertionError
========================== 1 failed in 0.08 seconds ===========================

加上 --tb=no 参数执行

test_tb.py F                                                             [100%]

========================== 1 failed in 0.05 seconds ===========================

--tb=no 是不显示报错的回溯内容

—tb=line

line 模式使用一行输出所有的错误信息

test_tb.py F                                                             [100%]

================================== FAILURES ===================================
D:\soft\kecheng202004\demo\test_tb.py:8: AssertionError: assert "hello" == "world"
========================== 1 failed in 0.06 seconds ===========================

—tb=short

short 模式显示断言报错的位置，不显示用例前面的代码

test_tb.py F                                                             [100%]

================================== FAILURES ===================================
___________________________________ test_01 ___________________________________
test_tb.py:8: in test_01
    assert result == expected
E   AssertionError: assert "hello" == "world"
E     - hello
E     + world
========================== 1 failed in 0.06 seconds ===========================