Error when trying to read a file

[Manuel Martín]

My WIPY3 gets OSError: [Errno 13] EACCES when trying to read a file. I've tried restoring if to factory settings and still. Some weeks ago it was fine, but I get this error since yesterday.

My code on main.py (boot.py is empty):

print('Ejecutando main.py...')

import os

f = open('datos','w')
f.write('123')
f.close()
f = open('datos','w')
f.read()
f.close()

This is what i get on console:

Uploading project (main folder)...
Safe booting device... (see settings for more info)
Uploading to /flash...
Reading file status
[1/1] Writing file main.py (0kb)
Upload done, resetting board...
OKets Jun  8 2016 00:22:57

rst:0x7 (TG0WDT_SYS_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff8020,len:8
load:0x3fff8028,len:2128
load:0x4009fa00,len:19760
entry 0x400a05bc
Ejecutando boot.py...
Ejecutando main.py...
Traceback (most recent call last):
  File "main.py", line 9, in <module>
OSError: [Errno 13] EACCES
Pycom MicroPython 1.20.2.r3 [v1.11-044dfea] on 2020-12-23; WiPy with ESP32
Type "help()" for more information.

I've tried updating the firmware, deleted /flash folder several times... seems like it doesnt have perms to read files on /flash, tho it can create the files (i've seen them on FTP)

any help please?

[robert-hh]

@Manuel-Martín said in Error when trying to read a file:

f = open('datos','w')

In line 8 you open the file in Write mode. Then you cannot read from it. You have to open it in read mode

f = open('datos','r')

[Manuel Martín]

my god... thank you very much. it works now, but I have another issue: when I try to download the file trough FTP, its always empty. can someone help me with that please?

[robert-hh]

@Manuel-Martín Hard to tell why.
Which ftp client are you using?
Can you download other files with ftp, like main.py.

[Manuel Martín]

@robert-hh im accesing through a chrome tab window: ftp://192.168.0.14/flash/
after asking me user and password it allows me to see and access all the files, and can download all of them though they end up being as empty files in my computer

[robert-hh]

@Manuel-Martín Try another ftp client, like filezilla. I have the same issue here with chrome. Filezilla works.

[Manuel Martín]

@robert-hh thank robert, with filezilla it works nice.