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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Micro Python Tutorial Exercise 01
MicroPythonTutorialExercise01

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%%info
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The file {{main.py}} is special in MicroPython, 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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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.
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).
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%%python \\# this is a comment
%%python
try:
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print('hello world.')
print("hello again.") # you can use single or double quotes
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.')
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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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__See also:__ [The REPL|MicroPythonTutorialTheREPL]
%%filename main.py %%
%%python
try:
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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