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Page References

Incoming links Outgoing links
Micro Python Tutorial Exercise 02
MicroPythonTutorialExercise02

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At line 1 changed one line
!!! Functions
!!! Blocks
At line 5 changed one line
We can define __functions__ in Python. Functions are defined globally, within the file/module as they begin in column 0.
In Python, a block is a group of statements that belong together, forming the body of a function, loop, class or other structure. A block is defined by an initial line followed by the contents of the block indented four characters.
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As an example, a {{for}} block sets up a loop:
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\\# we define a function called "display_message"
def display_message(message):
print(message)
raise Exception('we did something wrong.')
for i in range(0,5):
print(i)
%%
Notice that the contents of the {{for}} block are indented four characters. This causes the contents of the block to be executed five times, printing the value of the index variable ("i") each time.
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!! The try-except-finally Block
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.
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).
%%filename main.py %%
%%python
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display_message('hello world.')
except Exception as e:
print('an error occurred: {}'.format(e))
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.')
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# this is always executed, no matter what
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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}}).
%%filename main.py %%
%%python
try:
print('hello world.')
except Exception as ex:
print('an error occurred: {}'.format(ex))
finally:
print('complete.')
%%
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__Next:__ [MicroPython Tutorial Exercise 3|MicroPythonTutorialExercise03]: classes
__Next:__ [MicroPython Tutorial Exercise 3|MicroPythonTutorialExercise03]: functions
This page (revision-16) was last changed on 2025-07-30 12:48 by Murray AltheimTop