Fail to create log file from boot.py

[beelzmon]

I have set up a logging class in my main.py, being:

class Logger:
    file_name = None
    def __init__(self,file_name):
        self.file_name = file_name
    def write(self,msg):
        with open(self.file_name,"a") as file:#write a message to log 
            file.write(msg)
            file.write('\n')
    def clear(self):
        with open(self.file_name,"w")#remove closed file
            pass

In my boot file and my main file i call on it to create logs, however it does not create any of the logs it should for the boot file -- only for the main.
Below is the boot:

from machine import UART
from network import LoRa
from network import WLAN,Bluetooth
from main import Logger
import binascii
import os
import pycom
logger = Logger("SessionLog.txt")
logger.write("Booting")
pycom.heartbeat(False)
# Setting up the UART to dump the output to the console
uart = UART(0, 115200)
os.dupterm(uart)
logger.write("UART enabled and console dumped")
# Disable bluetooth
bluetooth = Bluetooth()
logger.write("Bluetooth initialized")
bluetooth.deinit()
logger.write("Bluetooth disabled")
pycom.wifi_on_boot(False)
logger.write("Wifi on boot turned off")
lora = LoRa(mode=LoRa.LORAWAN, public=1, adr=0, tx_retries=0) # Getting the LoRa MAC
logger.write("Lora initialized for grabbing MAC address")
print("LORA MAC")
logger.write("LORA MAC")
print(binascii.hexlify(lora.mac()))
logger.write(binascii.hexlify(lora.mac()))

The same sort of routine logs are written in the main.py, and these are the only lines reflected in the SessionLog.txt file. So the issue is that the boot.py specifically does not write to the file. No error is raised.

[kjm]

My understanding is main.py runs after boot.py so there would be no logger available for boot.py

[robert-hh]

@beelzmon
I thinkk there is a problem with the line
from main.py import Logger
in boot.py. That one causes main.py to be compiled and all statements at top level to be executed. So you get the main.py log messages eventually before the boot.py log messages in the log file.
You could try to either:

• put the class logger into a separate file, or
• put the class logger into boot.py.

Since both boot.py and main.py share the same name space, the class logger would be available to both. I prefer the separate file for the logger class.