FileIO
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Write and read files using MircoPython.
Write to File[edit]
1 # write 100 random values to a file
2 import random
3 import os
4
5 file = open('datafile01.txt', 'a')
6 for i in range(100):
7 random_integer = random.randint(1, 1000)
8 file.write(str(i) + "; " + str(random_integer) + "\n")
9 print(str(i) + "; " + str(random_integer))
10 file.close()
Or and alternative: here the file is closed automatically when the block inside the with statement is exited.
1 # write 100 random values to a fileimport random
2
3 # Use a context manager to handle the file
4 import random
5 import os
6
7 with open('datafile02.txt', 'a') as file:
8 for i in range(100):
9 random_integer = random.randint(1, 1000)
10 file.write(str(i) + "; " + str(random_integer) + "\n")
11 print(str(i) + "; " + str(random_integer))
Read to File[edit]
1 # Read the file
2 import os
3
4 with open('datafile01.txt', 'r') as file:
5 for line in file:
6 columns = line.strip().split('; ')
7 print(columns[1] + " is the value at: " + columns[0])
Get and Put Files Between Microcontroller and Local Machine[edit]
Files can be copied via the command line tool Adafruit MicroPython tool (ampy).
pip3 install adafruit-ampy
To get a file from the microcontroller to the local machine, use the following command:
ampy --port /dev/tty.usbmodem143101 get FILE_NAME_OF_REMOTE_FILE.FILE_EXTENSION FILE_NAME_FOR_THE_LOCAL_FILE.FILE_EXTENSION
To put a file to the microcontroller from the local machine, use the following command:
ampy --port /dev/tty.usbmodem143101 put FILE_NAME_OF_THE_LOCAL_FILE.FILE_EXTENSION FILE_NAME_FOR_REMOTE_FILE.FILE_EXTENSION
Alternatively, you can use the Thonny IDE.