QUERY · ISSUE

print output redirection not working as in Python.

openby beetlegiggopened 2025-09-17updated 2025-09-19

bug

Port, board and/or hardware

raspberry pico2w

MicroPython version

MicroPython v1.26.0 on 2025-08-09; Raspberry Pi Pico 2 W with RP2350

Reproduction

# print redirection test
import sys
proper_stdout = sys.stdout       # save original
log = open('out.txt', 'w')
sys.stdout = log                 # redirect stdout            

print('hello')
print('wheres my print')

log.close()
sys.stdout = proper_stdout      # revert redirect

print('back to the future')
print('so whats in the out.txt file?')

read_log = open('out.txt', 'r')
for line in read_log:
    print(line)
read_log.close()

Expected behaviour

The sys.stdout would be redirected to the 'log' file (out.txt) and the following print two print statement contents would be directed to the out.txt file.

Observed behaviour

Traceback (most recent call last):
File "<stdin>", line 5, in <module>
AttributeError: 'module' object has no attribute 'stdout'

line 5 is:
sys.stdout = log

Additional Information

This code snippet works as expected in Python.

Code of Conduct

Yes, I agree

CANDIDATE · ISSUE

Multithread breaks file operations on pico2w.

openby tudorapoopened 2025-01-08updated 2025-03-03

bugport-rp2

Port, board and/or hardware

RPI_PICO2_W

MicroPython version

MicroPython v1.25.0-preview.180.g495ce91ca on 2025-01-06; Raspberry Pi Pico 2 W with RP2350

Reproduction

copy the below threads using code and run it:

import time
import _thread

global killme

def threadtest():
    global killme
    print("Other starts")
    while True:
        if killme:
            break
        print("másik thread")
        time.sleep(3.17)
    print("Other ends")

killme = False

try:
    new_thread = _thread.start_new_thread(threadtest, ())
    print("Main starts")
    while True:
        print("Main thread")
        time.sleep(1)
except KeyboardInterrupt as theInterrupt:
    print("Main ends")
    killme = True

run it
stop it
try to copy or delete any file with mpremote, it will hang
powercycle (pull out the usb conenctor and back) and things will work until I run the above code again.

Expected behaviour

Expected to be able to upload code.

Observed behaviour

Was not able to upload code.

Additional Information

When I copied/ran non-threaded code, a simple hello world the problem did not happen.

Code of Conduct

Yes, I agree