Re: [Tutor] Help with Multiple Inheritance in Classes
Thanks so much. You've been a great help. You have confirmed that the lecture's question is flawed. Appreciate the help. Regards Vusa On Thu, Feb 9, 2017 at 12:02 PM, Alan Gauld via Tutor wrote: > On 09/02/17 09:25, Vusa Moyo wrote: > > > class Cat: > > name = "" > > kind = "cat" > > color = "" > > value = 100.00 > > > > def description(self): > > desc_str = "%s is a %s %s cat worth R%.2f." % (self.name, > > self.color, self.kind, self.value) > > return desc_str > > > > The above code is the question, which I am not allowed to edit. > > > > So just to test the lecturer's code, I run the command > > > > print(Cat.description()) > > But the definition of description() take an argument - self. > self is expected to be an instance of Cat. > You can either pass that in manually > > print( Cat.description(Cat()) ) > > or, more normally, create an instance of cat and call > description on that: > > my_cat = Cat() > print( my_cat.description() ) > > > Any other code I append to it by inheriting the class Cat, will still > have > > that similar error. > > I'm not sure what you mean by that, I'd need an example. > If you mean you just add the code after the above line then > obviously you will still get the error. > > > Now, I've added the following code to inherit the class Cat: description. > > > > class Cat1(Cat): > > name = "Whiskers" > > kind = "Burmese cat" > > color = "grey" > > value = 3000.00 > > > > When I run this command, I still receive the same error. > > > > print(Cat1.description()) > > For the same reason; you are still not passing an instance > of Cat (or Cat1) to the method. You need to create an > instance and then call the method on that: > > other_cat = Cat1() > print( other_cat.description() ) > > > -- > Alan G > Author of the Learn to Program web site > http://www.alan-g.me.uk/ > http://www.amazon.com/author/alan_gauld > Follow my photo-blog on Flickr at: > http://www.flickr.com/photos/alangauldphotos > > > ___ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor > ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Help with Multiple Inheritance in Classes
Hi Alan. You are correct with the indentation. class Cat: name = "" kind = "cat" color = "" value = 100.00 def description(self): desc_str = "%s is a %s %s cat worth R%.2f." % (self.name, self.color, self.kind, self.value) return desc_str The above code is the question, which I am not allowed to edit. So just to test the lecturer's code, I run the command print(Cat.description()) This returns an error. >>>> TypeError: description() missing 1 required positional argument: 'self' To me, this is flawed. I should be able to get a fault less response from that command. Any other code I append to it by inheriting the class Cat, will still have that similar error. Now, I've added the following code to inherit the class Cat: description. class Cat1(Cat): name = "Whiskers" kind = "Burmese cat" color = "grey" value = 3000.00 When I run this command, I still receive the same error. print(Cat1.description()) Please assist where possible. Regards Vusa On Wed, Feb 8, 2017 at 11:06 AM, Alan Gauld via Tutor wrote: > On 08/02/17 07:11, Vusa Moyo wrote: > > I have a suspicion my lecturer's question is flawed, so I'd like to pose > it > > to you guys to confirm my suspicions. > > I think your interpretation of the question is flawed. > See Peter's reply for why. > > However another point is > > > class Cat: > > name = "" > > kind = "cat" > > color = "" > > value = 100.00 > > def description(self): > > > > desc_str = "%s is a %s %s cat worth R%.2f." % (self.name, self.color, > > self.kind, self.value) > > Python is sensitive to indentation. This line needs > to be indented inside the def statement. (This may > be a mail formatting issue but since the rest of > your code looks OK I doubt it) > > > > -- > Alan G > Author of the Learn to Program web site > http://www.alan-g.me.uk/ > http://www.amazon.com/author/alan_gauld > Follow my photo-blog on Flickr at: > http://www.flickr.com/photos/alangauldphotos > > > ___ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor > ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] Help with Multiple Inheritance in Classes
I have a suspicion my lecturer's question is flawed, so I'd like to pose it to you guys to confirm my suspicions. Here goes.. I've gone and created a Class Cat1(cat): <-- inherited class, but cant seem get the code right which allows the test code to run successfully. We have a class defined for cats. Create a new cat called cat1. Set cat1 to be a grey Burmese cat worth 3000 with the name Whiskers. # define the Cat class class Cat: name = "" kind = "cat" color = "" value = 100.00 def description(self): desc_str = "%s is a %s %s cat worth R%.2f." % (self.name, self.color, self.kind, self.value) return desc_str # your code goes here # test code print(cat1.description()) ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] os.popen - using commands and input %
SOLVED> the code I used was.
for i in range(len(pids)):
final.append(subprocess.Popen(["sudo pmap -d %s | grep private |awk
'{print $1}' | awk -FK '{print $1}'" % pids[i]], shell=True,
stderr=subprocess.PIPE, stdout=subprocess.PIPE).communicate()[0])
Allowed me to append the subprocess output to my list.
Thanks for the help everyone :-)
On Mon, Nov 16, 2015 at 3:07 PM, Vusa Moyo wrote:
> The following code seems to be pointing me to the right direction, BUT, my
> list has 0's instead of the output generated.
>
> >>> for i in range(len(pids)):
> ... final.append(subprocess.call(["sudo pmap -d %s | grep private |awk
> '{print $1}' | awk -FK '{print $1}'" % pids[i]], shell=True))
> ...
> 60772
> 106112
> 3168
> 13108
> 14876
> 8028
> 3328
> 8016
> 139424
> 6037524
> 5570492
> 4128
> 144364
> 154980
> 154980
> >>> pmap_str
> [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
>
> I;m assuming the zero's are exit codes, which then populate the list,
> which is not what I'm after. .
>
> On Mon, Nov 16, 2015 at 2:17 PM, Vusa Moyo wrote:
>
>> Hi Guys,
>>
>> OS = SuSE Enterprise Linux
>> Python V2.7
>>
>> My code is as follows
>>
>> # this list contains system process ID's
>> pidst=[1232, 4543, 12009]
>>
>> pmap_str=[]
>> command="pmap -d %s | grep private |awk '{print $1}' | awk -FK '{print
>> $1}'"
>>
>> for i in range(len(pids)):
>> pmap_str.append(os.popen("(command) % pidlist_int[i])")) # <--
>> this is where I need help, please
>>
>> As I'm sure you can see, I'm trying to output the os.popen output to a
>> new list.
>>
>> On the shell console I can run the pmap command as follows
>>
>> pmap -d | grep private |awk '{print $1}' | awk -FK '{print $1}'
>>
>> Output will be a single number such as 485921.
>>
>> My error is on the line of code shown above. Please assist.
>>
>> Kind Regards
>>
>
>
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Re: [Tutor] os.popen - using commands and input %
The following code seems to be pointing me to the right direction, BUT, my
list has 0's instead of the output generated.
>>> for i in range(len(pids)):
... final.append(subprocess.call(["sudo pmap -d %s | grep private |awk
'{print $1}' | awk -FK '{print $1}'" % pids[i]], shell=True))
...
60772
106112
3168
13108
14876
8028
3328
8016
139424
6037524
5570492
4128
144364
154980
154980
>>> pmap_str
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
I;m assuming the zero's are exit codes, which then populate the list, which
is not what I'm after. .
On Mon, Nov 16, 2015 at 2:17 PM, Vusa Moyo wrote:
> Hi Guys,
>
> OS = SuSE Enterprise Linux
> Python V2.7
>
> My code is as follows
>
> # this list contains system process ID's
> pidst=[1232, 4543, 12009]
>
> pmap_str=[]
> command="pmap -d %s | grep private |awk '{print $1}' | awk -FK '{print
> $1}'"
>
> for i in range(len(pids)):
> pmap_str.append(os.popen("(command) % pidlist_int[i])")) # <--
> this is where I need help, please
>
> As I'm sure you can see, I'm trying to output the os.popen output to a new
> list.
>
> On the shell console I can run the pmap command as follows
>
> pmap -d | grep private |awk '{print $1}' | awk -FK '{print $1}'
>
> Output will be a single number such as 485921.
>
> My error is on the line of code shown above. Please assist.
>
> Kind Regards
>
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[Tutor] os.popen - using commands and input %
Hi Guys,
OS = SuSE Enterprise Linux
Python V2.7
My code is as follows
# this list contains system process ID's
pidst=[1232, 4543, 12009]
pmap_str=[]
command="pmap -d %s | grep private |awk '{print $1}' | awk -FK '{print $1}'"
for i in range(len(pids)):
pmap_str.append(os.popen("(command) % pidlist_int[i])")) # <--
this is where I need help, please
As I'm sure you can see, I'm trying to output the os.popen output to a new
list.
On the shell console I can run the pmap command as follows
pmap -d | grep private |awk '{print $1}' | awk -FK '{print $1}'
Output will be a single number such as 485921.
My error is on the line of code shown above. Please assist.
Kind Regards
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Re: [Tutor] Messy - Very Messy string manipulation.
Thanks Meenu.
str.translate.
Worked like a charm for python 3.5.
And thanks Alan Gauld for the 2.7 version.
Appreciate the help guys. You guys are awesome.
Regards
Vusa
On Wed, Oct 28, 2015 at 6:23 PM, meenu ravi wrote:
> Hi Vusa,
>
> I was not able to reply through mail list due to some issue. So just
> replying through email.
>
> We can make use of string translate method for more pythonic way. If you
> are using python 2.x, the following itself should work for you:
>
> ***
> import string
> def anti_vowel(str):
> word = str.translate(None, 'aeiouAEIOU')
> return word
>
> print anti_vowel('The cow moos louder than the frog')
> ***
>
> And if you are using python 3.x, "None" inside the str.translate method
> doesn't work. So instead, you can use in this way:
>
> ***
> import string
> def anti_vowel(str):
> word = str.translate(str.maketrans("","","aeiouAEIOU"))
> return(word)
>
> print(anti_vowel("The cow moos louder than the frog"))
>
>
> ***
>
> The above code should work with python 2.x as well with python 2 syntax as
> follows:
>
> import string
> def anti_vowel(str):
> word = str.translate(string.maketrans('', ''), 'aeiouAEIOU')
> return word
>
> print anti_vowel('The cow moos louder than the frog')
>
>
> If you want to know more about translate method, please follow the link,
> https://docs.python.org/2/library/string.html#string-functions
>
> I hope you will get much more options through mailing list.
>
> Happy python:)
>
> Thanks,
> Meenakshi
>
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[Tutor] Messy - Very Messy string manipulation.
Hi Guys,
I've written a script to remove vowels from a string/sentence.
the while loop I'm using below is to take care of duplicate vowels found in
a sentence, ie
anti_vowel('The cow moos louder than the frog')
It works, but obviously its messy and n00by. Any suggestions on how I can
write this code better?
def anti_vowel(text):
vowel = ['a', 'e', 'i', 'o', 'u']
VOWEL = ['A', 'E', 'I', 'O', 'U']
manip = []
for i in text:
manip.append(i)
fufu = 0
#
while fufu < 16:
for x in vowel:
if x in manip:
manip.remove(x)
for y in VOWEL:
if y in manip:
manip.remove(y)
fufu = fufu + 2
strong = ''.join(manip)
return strong
Thanks - Vusa
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Re: [Tutor] Help with return results statement.
Thanks Alan.
Removed that .
=
# Add your functions below!
def average(numbers):
total = sum(numbers)
total = total / len(numbers)
return total
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
return 0.1 * homework + 0.3 * quizzes + 0.6 * tests
def get_letter_grade(score):
if score >= 90:
return "A"
elif score >= 80:
return "B"
elif score >= 70:
return "C"
elif score >= 60:
return "D"
else:
return "F"
#Class average
def get_class_average(students):
results = []
for a in students:
b = float(get_average(a))
results.append(b)
return average(results)
# prompt for results.
students = [lloyd, alice, tyler]
print(get_class_average(students))
bother = get_class_average([lloyd, alice, tyler])
print(get_letter_grade(bother))
=
Appreciate it.
Regards
Vusa
On Thu, Oct 22, 2015 at 11:14 AM, Alan Gauld
wrote:
> On 22/10/15 10:03, Vusa Moyo wrote:
>
>> Hi Guys. Thanks for the responses and assistance.
>>
>> I came right after-all. The last 2 blocks read the following.
>>
>
> Glad you are happy but there is still something you could improve:
>
> def get_class_average(students):
>> results = []
>> for a in students:
>> b = float(get_average(a))
>>
>
> You really don't need the float() here. get_average() is guaranteed
> to return a float.
>
> results.append(b)
>> return average(results)
>>
>>
>> students = [lloyd, alice, tyler]
>> print(get_class_average(students))
>> bother = get_class_average([lloyd, alice, tyler])
>> print(get_letter_grade(bother))
>>
>> Worked like a charm.
>>
>> Thanks for the assistance.
>>
>> Regards
>>
>> Vusa
>>
>>
>> On Tue, Oct 20, 2015 at 2:38 PM, Alan Gauld > <mailto:alan.ga...@btinternet.com>> wrote:
>>
>> On 20/10/15 12:29, Vusa Moyo wrote:
>>
>> Hi there. My script is as follows,
>>
>>
>> alice = {
>> "name": "Alice",
>> "homework": [100.0, 92.0, 98.0, 100.0],
>> "quizzes": [82.0, 83.0, 91.0],
>> "tests": [89.0, 97.0]
>> }
>>
>>
>> # Add your function below!
>> def average(numbers):
>>
>> >total = sum(numbers)
>> >total = float(total)
>>
>> That line isn't necessary since the inputs are floats already.
>>
>> >total = total / len(numbers)
>> >return total
>> >
>>
>> def get_average(student):
>> homework = average(student["homework"])
>> quizzes = average(student["quizzes"])
>> tests = average(student["tests"])
>> return 0.1 * homework + 0.3 * quizzes + 0.6 * tests
>>
>> def get_letter_grade(score):
>> if score >= 90:
>> return "A"
>> elif score >= 80:
>> return "B"
>>
>>
>> print get_average(lloyd)
>>
>> def get_class_average(students):
>> results = []
>> for a in students:
>> b = int(get_average(a))
>> results.append([b])
>> return results
>>
>>
>> get_class_average(alice)
>>
>> I receive a zero value for results, which doesnt quite make
>> sense to me.
>>
>>
>> Nor to me. Are you sure its a zero result? It should be a list of
>> some kind not a number. Or do you mean you get an empty list back?
>>
>> Notice that get_class_average() expects your students value to be
>> some kind of sequence or collection. The for loop will iterate
>> over that. If you pass Alice as a single student it will iterate
>> over the keys, trying first of all to get the average of "Alice"
>> which should fail with an error. Did you get any errors? If so
>> please let us see them.
>>
>> Please show us the actual code you execute, the actual output
>> and the full text of any errors.
>>
>> One other thing that seems weird to me is that you go to great
>> pains to produce a float as a result of get_ave
Re: [Tutor] Help with return results statement.
Hi Guys. Thanks for the responses and assistance.
I came right after-all. The last 2 blocks read the following.
def get_class_average(students):
results = []
for a in students:
b = float(get_average(a))
results.append(b)
return average(results)
students = [lloyd, alice, tyler]
print(get_class_average(students))
bother = get_class_average([lloyd, alice, tyler])
print(get_letter_grade(bother))
Worked like a charm.
Thanks for the assistance.
Regards
Vusa
On Tue, Oct 20, 2015 at 2:38 PM, Alan Gauld
wrote:
> On 20/10/15 12:29, Vusa Moyo wrote:
>
>> Hi there. My script is as follows,
>>
>
> alice = {
>> "name": "Alice",
>> "homework": [100.0, 92.0, 98.0, 100.0],
>> "quizzes": [82.0, 83.0, 91.0],
>> "tests": [89.0, 97.0]
>> }
>>
>
> # Add your function below!
>> def average(numbers):
>>
> >total = sum(numbers)
> >total = float(total)
>
> That line isn't necessary since the inputs are floats already.
>
> >total = total / len(numbers)
> >return total
> >
>
>> def get_average(student):
>> homework = average(student["homework"])
>> quizzes = average(student["quizzes"])
>> tests = average(student["tests"])
>> return 0.1 * homework + 0.3 * quizzes + 0.6 * tests
>>
>> def get_letter_grade(score):
>> if score >= 90:
>> return "A"
>> elif score >= 80:
>> return "B"
>>
>
> print get_average(lloyd)
>>
>> def get_class_average(students):
>> results = []
>> for a in students:
>> b = int(get_average(a))
>> results.append([b])
>> return results
>>
>>
> get_class_average(alice)
>>
>> I receive a zero value for results, which doesnt quite make sense to me.
>>
>
> Nor to me. Are you sure its a zero result? It should be a list of some
> kind not a number. Or do you mean you get an empty list back?
>
> Notice that get_class_average() expects your students value to be
> some kind of sequence or collection. The for loop will iterate over that.
> If you pass Alice as a single student it will iterate over the keys, trying
> first of all to get the average of "Alice" which should fail with an error.
> Did you get any errors? If so please let us see them.
>
> Please show us the actual code you execute, the actual output
> and the full text of any errors.
>
> One other thing that seems weird to me is that you go to great pains to
> produce a float as a result of get_average() but then you
> immediately convert it to an int. Why not leave it as a float?
>
>
> --
> Alan G
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
> http://www.amazon.com/author/alan_gauld
> Follow my photo-blog on Flickr at:
> http://www.flickr.com/photos/alangauldphotos
>
>
>
> ___
> Tutor maillist - Tutor@python.org
> To unsubscribe or change subscription options:
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>
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[Tutor] Help with return results statement.
Hi there. My script is as follows,
lloyd = {
"name": "Lloyd",
"homework": [90.0, 97.0, 75.0, 92.0],
"quizzes": [88.0, 40.0, 94.0],
"tests": [75.0, 90.0]
}
alice = {
"name": "Alice",
"homework": [100.0, 92.0, 98.0, 100.0],
"quizzes": [82.0, 83.0, 91.0],
"tests": [89.0, 97.0]
}
tyler = {
"name": "Tyler",
"homework": [0.0, 87.0, 75.0, 22.0],
"quizzes": [0.0, 75.0, 78.0],
"tests": [100.0, 100.0]
}
# Add your function below!
def average(numbers):
total = sum(numbers)
total = float(total)
total = total / len(numbers)
return total
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
return 0.1 * homework + 0.3 * quizzes + 0.6 * tests
def get_letter_grade(score):
if score >= 90:
return "A"
elif score >= 80:
return "B"
elif score >= 70:
return "C"
elif score >= 60:
return "D"
else:
return "F"
print get_average(lloyd)
def get_class_average(students):
results = []
for a in students:
b = int(get_average(a))
results.append([b])
return results
=
When I pass
get_class_average(alice)
I receive a zero value for results, which doesnt quite make sense to me.
please explain how I'm getting this wrong.
Regards
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