This page (revision-21) was last changed on 2025-07-30 13:27 by Murray Altheim

This page was created on 2025-07-30 02:24 by Murray Altheim

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Version Date Modified Size Author Changes ... Change note
21 2025-07-30 13:27 826 bytes Murray Altheim to previous

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Micro Python Tutorial Exercise 01
MicroPythonTutorialExercise01

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%%info
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The file {{main.py}} is special in MicroPython, only in the sense that when you power-on the device and/or press the reset button, the main.py file is executed.
%%filename main.py %%
%%python
\\# this is a comment
print('hello world.')
print("hello again.")
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In Python there is a {{try-except-finally}} structure called a "compound statement" consisting of three separate __blocks__, which is ideal for a main.py file.
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In the below example, there is a {{try}} block, followed by an {{except}} block, followed by a {{finally}} block. A {{try}} block must be followed by an {{except}} block and/or a {{finally}} block (you must have one of them).
The file (also sometimes called a "script") named {{main.py}} is special in MicroPython, in the sense that when you power-on the device and/or press the reset button, the contents of the {{main.py}} file are passed to the MicroPython interpreter and the program contained within main.py is executed. It's the ''entry point'' for running any application in Python.
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%%python
try:
%%python \\# this is a comment
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print('hello world.') # remember to indent the insides of your blocks by 4 characters!
except Exception:
# this block is executed if there is an exception (error)
print('an error occurred.')
finally:
# this is always executed, no matter what
print('complete.')
print('hello world.')
print("hello again.") # you can use single or double quotes
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If you want to use the exception to print out an error message you need to assign it to a variable (in this case, we've used {{ex}}).
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%%filename main.py %%
%%python
try:
__See also:__ [The REPL|MicroPythonTutorialTheREPL]
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print('hello world.')
except Exception as ex:
print('an error occurred: {}'.format(ex))
finally:
print('complete.')
%%
This page (revision-21) was last changed on 2025-07-30 13:27 by Murray AltheimTop