SQLAlchemy: how to filter date field?

Michael Zippo

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Here is model:

class User(Base):
    ...
    birthday = Column(Date, index=True)   #in database it"s like "1987-01-17"
    ...

I want to filter between two dates, for example to choose all users in interval 18-30 years.

How to implement it with SQLAlchemy?

I think of:

query = DBSession.query(User).filter(
    and_(User.birthday >= "1988-01-17", User.birthday <= "1985-01-17")
) 

# means age >= 24 and age <= 27

I know this is not correct, but how to do correct?

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SQLAlchemy: how to filter date field? del: Questions

__del__

How can I make a time delay in Python?

5 answers

I would like to know how to put a time delay in a Python script.

2973

Answer #1

import time
time.sleep(5)   # Delays for 5 seconds. You can also use a float value.

Here is another example where something is run approximately once a minute:

import time
while True:
    print("This prints once a minute.")
    time.sleep(60) # Delay for 1 minute (60 seconds).

2973

Answer #2

You can use the sleep() function in the time module. It can take a float argument for sub-second resolution.

from time import sleep
sleep(0.1) # Time in seconds

SQLAlchemy: how to filter date field? del: Questions

__del__

How to delete a file or folder in Python?

5 answers

How do I delete a file or folder in Python?

2639

Answer #1

os.remove() removes a file.
os.rmdir() removes an empty directory.
shutil.rmtree() deletes a directory and all its contents.

Path objects from the Python 3.4+ pathlib module also expose these instance methods:

pathlib.Path.unlink() removes a file or symbolic link.
pathlib.Path.rmdir() removes an empty directory.

We hope this article has helped you to resolve the problem. Apart from SQLAlchemy: how to filter date field?, check other __del__-related topics.

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Anna Gonzalez

Warsaw | 2023-03-24

Maybe there are another answers? What SQLAlchemy: how to filter date field? exactly means?. I just hope that will not emerge anymore

Olivia Krasiko

Milan | 2023-03-24

Maybe there are another answers? What SQLAlchemy: how to filter date field? exactly means?. I am just not quite sure it is the best method

Walter Richtgofen

Texas | 2023-03-24

Python functions is always a bit confusing 😭 SQLAlchemy: how to filter date field? is not the only problem I encountered. I just hope that will not emerge anymore