python passing function variables to another function-CodePudding

I am trying to pass a variable from one function into my main engine function in a separate file. I have looked up other answers and gone through some but I can't seem to wrap my head around it..

load_file.py

def get_connection():
    cursor = connection.cursor()
    cursor.execute(
        "SELECT....)

    data_connection = cursor.fetchall()
    return data_connection


def download_files(data_connection):
        data_connection = cursor.fetchall()
        for data_connection_detail in data_connection:
            connection_type = data_connection_detail[1]

            if connection_type == 'IMAP':
                ez_email.read_email_imap(data_connection_detail)

            elif connection_type == 'POP3':
                ez_email.read_email_pop3(data_connection_detail)

            elif connection_type == 'FTP':
                ez_ftp.easy_ftp(data_connection_detail)

main.py

from load_file import download_files
from load_file import get_connection

def run_engine():
    while True:
        get_connection()
        download_files()


if __name__ == "__main__":
    run_engine()

When I pass 'data_connection' to 'download_files' function it says I have an unfilled parameter inside of my main.py engine.

I'm sorry if this has already been answered but I'm just having trouble understanding it.

CodePudding user response：

The line

def download_files(data_connection):

implies a parameter to be passed.

I think you might want

def run_engine(): while True: conn = get_connection() download_files(conn)

The get_connection function looks strange to me, like it's not returning a connection but the results of fetchall.

CodePudding user response：

Your download_files() function has a required parameter (data_connection). When you call it in run_engine, you are not passing a parameter.

You will need to capture the returned variable from get_connection and pass it to download_files, like this:

data_con = get_connection()  # place the returned variable from get_connection into a variable called data_con
download_files(data_con)     # pass that data_con variable to the download_files function

But the returned value from get_connection is not actually a connection in your current code - you'll need to make sure you're returning/passing the right variable.