The error is self-explanatory. You are trying to subscript an object which you think is a list or dict, but actually is None. This means that you tried to do: None[something] This error means that you attempted to index an object that doesn't have that functionality. You might have noticed that the method sort() that only modify the list have no return value printed – they return the default None. 'NoneType' object is not subscriptable is the one thrown by python when you use the square bracket notation object[key] where an object doesn't define the getitem method . This is a design principle for all mutable data structures in Python.

sadly it's the same... rst:0x7 (TG0WDT_SYS_RESET),boot:0x37 (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:2140 ho 0 tail 12 room 4 load:0x4009fa00,len:19760 entry 0x400a05bc

@Strevens great you got it to work. If you have time, could you please take a look at my topic at the following: https://forum.pycom.io/topic/6141/scd30-oserror-i2c-bus-error

You could use the rtc.now(), that one contains microsecounds.

I am guessing not...these forums don't really seem to active. I was looking for something similar, which would definitely come in handy when emulating LTE connections. Waiting for a 10+ min attach to find an error in code really slows things down.

@netskink said in Interactive console with operational code: I've worked with esp32 in C and there is a capability where you can add a console component to your esp32 C app. Given that C is a compiled language, this is hard to understand for me. So I assume it's some kind of firmware/application package which is running in the device. Still, the ESP32 does not have a general purpose Operating System. If you want to have the Python console while an application code is running, you can start that application in a new thread and terminate the thread which started it. Then you will get the REPL prompt again. But this is not general multitasking, just a method to run several tasks at the same time.

Solved : turns out I needed a USB<->TTL and not an USB<->RS232... I did not know about the TTL standard, as I did not study eletronics at all. Gotta learn the hard way !

Digital Signatures / ECC No, I have to communicate with a secure device that requires ECC to establish a shared AES key. I am trying to covert the library: https://github.com/starkbank/ecdsa-python Having to convert recursive functions. Wondering if there is an easier (faster) way.

@railmonitor said in Wrong dates on files saved to SD card: I seems that the filesystem is using an "epoch" date of 1st of january 2000. But how can i happen that it's giving me dates from newyearseve 1999? MicroPython does not care for timezones. It always assumes UTC. Since you PC does know timezones, there can be differences of a few hours. And unless you set the time of your FiPy properly, the time stamp value will start January 1st, 2000 on every boot. The Linux epoch time is January 1st, 1970. That may cause the 30 years difference. So it looks like the compensation for the epoch times difference is applied twice. May I ask you to raise an issue. That ensures that this glitch does not get lost and will eventually be fixed.

Do you know how now？😂 I have the same question as you.

@Gijs Hello! that pin are not needed, infact my code is working, one hardware pin "p2" had some issue, it is constant 3.3V which means that the ploadPin are not toggled. The code awill hopefully be uploaded on Git!

@crumble many thanks, I knew it would be a simple answer. I was fooled by IDE and now feel a bit foolish. I appreciate your quick reply it helped a lot. Definitely need to work more with micropython.

Dear @gazmcghee, "The Frozen code implementation might not support sub-directories in MicroPython code." So does it support sub-directories or not? I was worried about that as well but I can well confirm everything works as intended. Our Terkin Datalogger contains modules with submodules [1] and freezing them works without any issue. Saying this, we would like to mention we are working with 1.20.x. With kind regards, Andreas. [1] https://github.com/hiveeyes/terkin-datalogger/tree/master/src/lib/terkin

@robert-hh Great thanks! Hadn't found those methods myself, only been coding in Python for a few months! For anyone else looking for a similar solution, this should do the trick: sd = SD() os.mount(sd, '/sd') f = open('filepath') lines = [] stepsize = 5 offset = 0 def read_lines(): global offset global lines f.seek(offset) for x in range(stepsize): lines.append(f.readline().strip()) print(lines) offset = f.tell() print(offset) lines = [] Then you can close (and delete if you want) the file when done calling the method.

@robert-hh I have recompiled the interpreter with #define MICROPY_TASK_STACK_SIZE (16 * 1024) in mptask.h and that's fixed the problem, by increasing stack_len in the line stack_len = (MICROPY_TASK_STACK_SIZE_PSRAM / sizeof(StackType_t)); in mptask.c Strangely, I still had to set the stack size in micropython with _thread.stack_size(16 * 1024). Also unexpected was that my recursion check routine still returned the same values, so perhaps there actually is an interpreter recursion limit, distinct from the interpreter call stack limit. Ultimately tho, the change prevented the exception being thrown in my code, so yay.