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Start your free trialRobert Baucus
3,400 PointsHow to run morse.py (to test it like the challenge does)
I was able to pass the morse.py challenge (by the skin of my teeth) but I am not really confident with Classes and was experimenting with them to solidify my knowledge. Messing around in the shell, I realized that I don't even know how to run the program so that morse turns the pattern, "." "." "." into "dot" "dot" "dot".
Here is the code that I wrote:
class Letter:
def __init__(self, pattern=None):
self.pattern = pattern
def __str__(self):
pattern = []
for i in pattern:
if i == ".":
pattern.append("dot")
elif i == "_":
pattern.append("dash")
return "-".join(pattern)
class S(Letter):
def __init__(self):
pattern = ['.', '.', '.']
super().__init__(pattern)
It seems to work ok in the workspace on treehouse, but I can't figure how to run this on my own computer. Here is a printout of what I have tried (Win10):
>>> from morse import Letter,S
>>> s = S()
>>> print(s)
>>> s = S(Letter)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: __init__() takes 1 positional argument but 2 were given
>>> s = Letter()
>>> s
<morse.Letter object at 0x000001028BC8C780>
>>> s.pattern
>>> print(s.pattern)
None
>>> print(s.__str__)
<bound method Letter.__str__ of <morse.Letter object at 0x000001028BC8C780>>
>>>
1 Answer
Chris Freeman
Treehouse Moderator 68,423 PointsThe Letter.__str__
method is using the local variable pattern
in the for
loop iterable instead of the attribute self.pattern
. By using the local variable pattern
there is nothing to loop over since it was just initialized to the empty list.