This page (revision-9) was last changed on 2025-07-30 12:47 by Murray Altheim

This page was created on 2025-07-30 10:58 by Murray Altheim

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Page References

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Micro Python Tutorial Scope
MicroPythonTutorialScope

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Difference between version and

At line 12 removed one line
* __function inside function__:
At line 45 added 4 lines
If you only ever expect to use a function within an existing function, yes, you can define
a function within another function. This is called a __nested function__. The scope of names
is therefore determined by where they are defined.
At line 69 added one line
!! Global Scope
At line 71 added 53 lines
These are names defined at the top level (i.e., starting at column 0) of a module,
or declared global with the {{global}} keyword.
%%filename global_scope.py %%
%%python {{{
# example of global scope
x = "I'm global"
def show_global():
print(x) # read-only access to the global value of x
show_global()
}}} %%
If you want to be able to modify a global variable, you can use the {{global}} keyword.
This is a safety feature so that you don't accidentally modify a global variable within a non-global scope unless you explicitly use the {{global}} keyword.
%%filename global_keyword.py %%
%%python {{{
# example of the global keyword
# we define a global variable called 'count'
count = 0
def increment_by_2():
global count # we use the 'global' keyword so we can modify x
count += 2
# we call the increment_by_2() function inside a for loop
for i in range(0,5):
increment_by_2()
print("i={}; count: {}".format(i, count))
}}} %%
%%repl {{{
/pyboard> repl
Entering REPL. Use Control-X to exit.
>
MicroPython v1.25.0 on 2025-04-15; Raspberry Pi Pico with RP2040
Type "help()" for more information.
>>>
>>> import global_keyword
i=0; count: 2
i=1; count: 4
i=2; count: 6
i=3; count: 8
i=4; count: 10
>>>
}}} %%
This page (revision-9) was last changed on 2025-07-30 12:47 by Murray AltheimTop