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Raise exception as e in if statement

I have come up with some code to send a file's exceptions as an email, and update a .txt log file. This method works for the following example:

from send_mail import send_error_email
from datetime import datetime
import logging

logging.basicConfig(filename='log.txt', level=logging.DEBUG, format='%(asctime)s %(levelname)s %(name)s %(message)s')
logger=logging.getLogger(__name__)

now = datetime.now()
date = now.strftime("%m/%d/%Y")
time = now.strftime("%H:%M:%S")

try:
    a = 2 + 'seven'
except Exception as e:
    print(e)
    send_error_email(exception=e, message="Can't add string and int")
    logging.exception('Oh no! Error on {} at {} Here is the traceback info:'.format(date, time))

However, the functions I want to apply it to have a lot of if/else syntax where exceptions are raised in the if or else block. Here are two examples:

def is_empty(test_df):
    if(test_df.empty):
        raise Exception("The sheet: {} is empty".format(sheet_name))
    else:
        pass
    for col in test_df.columns:
        miss = test_df[col].isnull().sum()
        if miss>0:
            raise Exception("{} has {} missing value(s)".format(col,miss))
    return None

or

def column_validation(sheet_name, input_file, expected_columns, input_columns, months):
    if len(expected_columns) == len(input_columns):
        for i in range(len(input_columns)):
            if input_columns[i] != expected_columns[i]:
                if sheet_name == "G2 30yr":
                    if input_columns[i][:3] in months:
                        continue
                elif sheet_name != "G2 30yr":
                    if input_columns[i] in months:
                        continue
                else:
                    raise Exception("The {} sheet of file: {}'s columns are not in expected format.".format(sheet_name, input_file))
    else:
        raise Exception("Number of columns in file: {}, {} sheet are not as expected".format(input_file, sheet_name))
    return None

I'm not sure how to employ the emailing and log function with exceptions that are raised outside of try/except blocks where I can access the Exception attributes using except Exception as e:. The below else will send the email notification but will not correctly update the log file.

else:
    send_error_email(exception=e, message="Can't add string and int")
    logging.error('Oh no! Error on {} at {} Here is the traceback info:'.format(date, time), stack_info = True)


source https://stackoverflow.com/questions/72721493/raise-exception-as-e-in-if-statement

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