Micropython file truncate doesn't exist #4775
Comments
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Hello, |
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I would use this if it was available |
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I finally defined my own truncate function: def Truncate(self, Num): |
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I'd appreciate having a log = open("log", "w")
blank_kb = "\n" * 1024
for i in range(16): log.write(blank_kb)
log.seek(0, 0)
print("\n", file=log)
...
# log.truncate() would be nice here
log.close() |
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Both the FatFS and LittleFS drivers provide a file truncate function, so this would be straight forward to implement (and of course make it match CPython). |
…truncate() Micropython does not support file truncations. This new implementation instead reads and writes each line into a new file, skipping the last line. See micropython/micropython#4775 for more information
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I could also really use this for a mpy project that I'm working on |
Is there any alternative in MicroPython to truncate a file at the current seek position? I don't want to just empty the file, I want to truncate it at a position.
The truncate function doesn't exist ( https://docs.micropython.org/en/latest/esp8266/tutorial/filesystem.html?highlight=open#creating-and-reading-files https://docs.micropython.org/en/latest/library/builtins.html?highlight=open#open )
Any alternatives?
I thought about copying the whole contents to a new file, but I wanted to avoid that since I'm limited to memory and storage(working on a LoPy4)
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