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Ok so I am writing a program in python, and I was just coding it and it printed out:

% py sk.py
The Zen of Python, by Tim Peters

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!

So I was thinking, what did it.

Then I found this issue on GitHub:

pallets/flask | JiewenGuan opened this issue on Feb 16 · 1 comment
why does my flask app prints out zen of python every time I run it? #4452

is this some kind of easter egg?
`(env) xxx@xxx-dev:~/xxx/xxxxxx# flask db upgrade
The Zen of Python, by Tim Peters

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than right now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!
INFO [alembic.runtime.migration] Context impl SQLiteImpl....`

I was using sqlalchemy to mapping the database similar to the follows:
table A
id PK
name

table B
id PK
roleA_id FK(tableA id)
roleB_id FK(tableA id)
roleC_id FK(tableA id)

I know there are better way to map it as a many to many relationship, but I choose to do so for reasons. after this db migration the app starts to print out the zen of python every time I run flask run/shell/db migrate/db upgrade, sometime even prints it out for multiple times. everything else works normal, which makes me quite confused.

Environment:

Python version: 3.9.2
Package Version
alembic 1.7.5
astroid 2.9.3
autopep8 1.6.0
blinker 1.4
click 8.0.3
dnspython 2.2.0
email-validator 1.1.3
Flask 2.0.2
Flask-DebugToolbar 0.11.0
Flask-Login 0.5.0
Flask-Migrate 3.1.0
Flask-SQLAlchemy 2.5.1
Flask-WTF 1.0.0
greenlet 1.1.2
idna 3.3
importlib-metadata 4.10.1
importlib-resources 5.4.0
isort 5.10.1
itsdangerous 2.0.1
Jinja2 3.0.3
lazy-object-proxy 1.7.1
ldap3 2.9.1
Mako 1.1.6
MarkupSafe 2.0.1
mccabe 0.6.1
pip 21.3.1
pkg_resources 0.0.0
platformdirs 2.4.1
pyasn1 0.4.8
pycodestyle 2.8.0
pylint 2.12.2
python-dotenv 0.19.2
setuptools 44.1.1
SQLAlchemy 1.4.31
toml 0.10.2
typing_extensions 4.0.1
Werkzeug 2.0.2
wrapt 1.13.3
WTForms 3.0.1
zipp 3.7.0

And someone anwsered:

davidism commented on Feb 16
Because you have something that does import this, but it's not flask.

Then I tried fixing that a variable I used in a entry in tkinter wasn't defined

It still printed the same thing but opened the application and didn't crash.

But then....
I looked at the top of the file....

AND THERE IT WAS:

from this import d

Anyways, I hate auto import.

Bye.