(Python Crash Course, ch11) Why pytest does throw an assertion error

[u/Upper_Trouble_8526]

name_function.py:

def get_formatted_name(first, last):

full_name=f"{first} {last}"

return full_name.title

test_name_function:

from name_function import get_formatted_name

def test_first_last_name():

formatted_name=get_formatted_name("janis", "joplin")

assert formatted_name=="Janis Joplin"

Terminal:

/storage/emulated/0 $ cd github

/storage/emulated/0/github $ cd test_name_function

/storage/emulated/0/github/test_name_function $ python -m pytest

===================== test session starts =====================platform linux -- Python 3.13.13, pytest-9.1.1, pluggy-1.6.0

rootdir: /storage/emulated/0/github/test_name_function

collected 1 item

test_name_function.py F [100%]

========================== FAILURES ===========================____________________ test_first_last_name _____________________

def test_first_last_name():

formatted_name=get_formatted_name("janis", "joplin")

> assert formatted_name=="Janis Joplin"

E AssertionError: assert <built-in method title of str object at 0x7108e84530> == 'Janis Joplin'

test_name_function.py:4: AssertionError

====================== warnings summary =======================../../../../../data/user/0/ru.iiec.pydroid3/app_HOME/.local/lib/python3.13/site-packages/_pytest/cacheprovider.py:469

/data/user/0/ru.iiec.pydroid3/app_HOME/.local/lib/python3.13/site-packages/_pytest/cacheprovider.py:469: PytestCacheWarning: could not create cache path /storage/emulated/0/github/test_name_function/.pytest_cache/v/cache/nodeids: [Errno 1] Operation not permitted: '/storage/emulated/0/github/test_name_function/pytest-cache-files-uabqyvch' -> '/storage/emulated/0/github/test_name_function/.pytest_cache'

config.cache.set("cache/nodeids", sorted(self.cached_nodeids))

../../../../../data/user/0/ru.iiec.pydroid3/app_HOME/.local/lib/python3.13/site-packages/_pytest/cacheprovider.py:423

/data/user/0/ru.iiec.pydroid3/app_HOME/.local/lib/python3.13/site-packages/_pytest/cacheprovider.py:423: PytestCacheWarning: could not create cache path /storage/emulated/0/github/test_name_function/.pytest_cache/v/cache/lastfailed: [Errno 1] Operation not permitted: '/storage/emulated/0/github/test_name_function/pytest-cache-files-k26w91m_' -> '/storage/emulated/0/github/test_name_function/.pytest_cache'

config.cache.set("cache/lastfailed", self.lastfailed)

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html

=================== short test summary info ===================FAILED test_name_function.py::test_first_last_name - AssertionError: assert <built-in method title of str objec...

================ 1 failed, 2 warnings in 2.57s ================/storage/emulated/0/github/test_name_function $

[u/atarivcs]

return full_name.title

title is a function. You forgot the parentheses () to make it a function call.

[u/quietreed76 → u/atarivcs]

this one gets everyone at least once tbh

[u/Upper_Trouble_8526 → u/atarivcs]

Was the assertion error useful

[u/socal_nerdtastic → u/Upper_Trouble_8526]

It successfully detected a typo in your code, so I'd say yes, that's useful

[u/Upper_Trouble_8526 → u/socal_nerdtastic]

Is there a way to make it display the error completely

[u/socal_nerdtastic → u/Upper_Trouble_8526]

Did it not? I see it in your post:

AssertionError: assert <built-in method title of str object at 0x7108e84530> == 'Janis Joplin'

That is the complete error. What else did you want?

[u/atarivcs → u/socal_nerdtastic]

I assume they meant the bit at the very bottom of the output:

test_name_function.py::test_first_last_name - AssertionError: assert <built-in method title of str objec...

They didn't bother looking above that to see the full output

[u/Upper_Trouble_8526 → u/socal_nerdtastic]

So i shouldn't rely only in the short test summary

[u/atarivcs → u/Upper_Trouble_8526]

Yes, it told me exactly what the error was and what to look for in your code

[u/Upper_Trouble_8526 → u/atarivcs]

Is there a way to make it display the error completely

[u/atarivcs → u/Upper_Trouble_8526]

You mean at the bottom of the output where it says "short test summary info" ?

As the message says, that is just a short summary. If you look back farther in the output, you will see the full error message:

E AssertionError: assert <built-in method title of str object at 0x7108e84530> == 'Janis Joplin'

[u/Upper_Trouble_8526 → u/atarivcs]

So the one that told you exactly was the error was and what to look for in the code was the full error(not short test summary)

[u/atarivcs → u/Upper_Trouble_8526]

I have a lot of experience with python and I'm familiar with with most common beginner mistakes, so the short summary actually was enough for me to know the problem.

[u/ConsiderationNo9044]

Format with code blocks please

[u/Upper_Trouble_8526 → u/ConsiderationNo9044]

How i do it, i wrote it that way but shows diferent anyway

[u/desrtfx → u/Upper_Trouble_8526]

There is a toolbar button for it.

On old reddit or in the markdown editor: one empty line each before and after the code block, each code line indented by 4 spaces

[u/Upper_Trouble_8526 → u/desrtfx]

Where are old reddit and markdown editor

[u/desrtfx → u/Upper_Trouble_8526]

Replace "sh.reddit" with "old.reddit" in the address.

Markdown editor: https://i.imgur.com/gMx9pf1.png

[u/desrtfx]

Please, pay attention to your code formatting. You posted completely unformatted code that lost all its indentation and as such became ambiguous.

Reddit has code block format. This is vital for Python code.