Re: [Tutor] new to programming and wondering about an IDE for Python on Linux (Robert Sjoblom)
-- Message: 1 Date: Mon, 27 Feb 2012 20:10:42 +0100 From: Robert Sjoblom robert.sjob...@gmail.com To: Alan Gauld alan.ga...@btinternet.com Cc: tutor@python.org Subject: Re: [Tutor] new to programming and wondering about an IDE for Python on Linux Message-ID: CAJKU7g03k2e+mJU8SZAmQnEjEEtXnk0x87Df9hhLoscq00=p...@mail.gmail.com Content-Type: text/plain; charset=ISO-8859-1 I'd appreciate any feedback on this and good tutorials or books on Python 3 and the IDEs suggested. There are many available and I'm wondering what you as users find effective. I fiddled a bit with the Eric Python IDE; Eric5 for Python3 and Eric4 for Python2; overall I'd say that Eclipse was a better experience, but Eric was by no means bad. I guess it comes down to user preferences. As for books, Dive Into Python 3 is one of the better books I've come across. http://eric-ide.python-projects.org/ -- best regards, Robert S. - My 2 cents on that (being also a beginner...). A very interesting and customizable IDE for Linux is the Spyder project. http://code.google.com/p/spyderlib/ It was previously known as Pydee and has lot's of features that I, as a beginner, find good, like the calltips, function browser, console, online help... and so on! Best regards! Joaquim Santos ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] initialising all elements of a matrix
I was wondering whether there is a faster/better/cleaner way of element wise operations of arbitrarily nested list. I wrote something like this for 1 level nested lists and am wondering whether there are any good idioms in python. I did this after a ridiculous amount of bad thinking/missteps in python for the simplest of cases. def init_p (arr): # input is always 2D matrix; init to uniform probability dist. q = [] row = len(arr) col = len(arr[0]) uni_dist = 1.0/(row *col) q = [ [uni_dist] * col for i in range(row)] return q Of course, without using external packages like numpy or any other scientific packages. sivaram -- ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] initialising all elements of a matrix
Sivaram Neelakantan wrote: I was wondering whether there is a faster/better/cleaner way of element wise operations of arbitrarily nested list. I wrote something like this for 1 level nested lists and am wondering whether there are any good idioms in python. I did this after a ridiculous amount of bad thinking/missteps in python for the simplest of cases. def init_p (arr): # input is always 2D matrix; init to uniform probability dist. q = [] row = len(arr) col = len(arr[0]) uni_dist = 1.0/(row *col) q = [ [uni_dist] * col for i in range(row)] return q Of course, without using external packages like numpy or any other scientific packages. Here's how I would break up the problem: # untested def nested_list(shape, value): if len(shape) == 1: return [value] * shape[0] return [nested_list(shape[1:], value) for _ in range(shape[0])] def get_shape(arr): shape = [] while isinstance(arr, list): shape.append(len(arr)) arr = arr[0] return shape def product(factors, product=1): for factor in factors: product *= factor return product def init_p(arr): shape = get_shape(arr) value = 1.0 / product(shape) return nested_list(shape, value) Now you can proceed to improve the parts independently... ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] initialising all elements of a matrix
On 2/28/2012 11:40 AM, Peter Otten wrote: def product(factors, product=1): for factor in factors: product *= factor return product can be simplified def product(factors): import operator return reduce(operator.mul, factors) -- Bob Gailer 919-636-4239 Chapel Hill NC ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] initialising all elements of a matrix
bob gailer wrote: On 2/28/2012 11:40 AM, Peter Otten wrote: def product(factors, product=1): for factor in factors: product *= factor return product can be simplified def product(factors): import operator return reduce(operator.mul, factors) If I had used the variant with reduce() would you have posted def product(factors): return reduce(operator.mul, factors) can be complexified def product(factors, product=1): for factor in factors: product *= factor return product (Just a pointless thought experiment) ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] python questions about dictionary loops
Hello,
I'm new to Python. Just started a few weeks ago and I've been learning some
basic things that I would like to put together but I don't even know where
to began. I am trying to do the following:
Make a program using two sentences of about 8 words (total between the two
sentences). I would then like to create a dictionary {} and split the
words of each sentence using one sentence as a dictionary key and using the
other sentence for the dictionary value. I would then like to use a loop
(while or for) that will write out a file that has the dictionary key and
dictionary value to it. How can I go about doing this? I've noticed with
Python there is more than one way to do most things. I would like the
simplest so that I can practice over and over again on my own until I
understand it. Thanks in advance
Regards,
Justin
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[Tutor] python dictionary and loop
Hello,
I am trying to do the following:
Make a program using two sentences of about 8 words (total between the two
sentences). I would then like to create a dictionary {} and split the
words of each sentence using one sentence as a dictionary key and using the
other sentence for the dictionary value. I would then like to use a loop
(while or for) that will write out a file that has the dictionary key and
dictionary value to it. How can I go about doing this? I've noticed with
Python there is more than one way to do most things. I would like the
simplest so that I can practice over and over again on my own until I
understand it. Thanks in advance
I forgot to add in my first email that I am using Windows Vista 64x and
running Python 3.2.2.
The two sentences I would like to use in the program is the following:
This is line one\nThis is line two! so I write: text_message = This is
line one\nThis is line two!
The dictionary name and key/value pairs will be:
my_sentences {'This':'This','is':'is','line':'line','one':'two'} # Does
this code split the words of each sentence so that the words in sentence 1
are keys, and the words in sentence 2 are values?
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Re: [Tutor] python questions about dictionary loops
Justin wrote:
I'm new to Python. Just started a few weeks ago and I've been learning some
basic things that I would like to put together but I don't even know where to
began. I am trying to do the following:
Make a program using two sentences of about 8 words (total between the two
sentences). I would then like to create a dictionary {} and split the words
of each sentence using one sentence as a dictionary key and using the other
sentence for the dictionary value. I would then like to use a loop (while or
for) that will write out a file that has the dictionary key and dictionary
value to it. How can I go about doing this? I've noticed with Python there is
more than one way to do most things. I would like the simplest so that I can
practice over and over again on my own until I understand it. Thanks in advance
Steps:
1. Do you know how to input / retrieve the two sentences? (Look at open() or
raw_input() if you do not )
2. Do you know how to split strings? Look at the string operations (the python
web API will show you if you read it)
3. Do you know how to create a dictionary and set values? Play around on the
interactive prompt if you do not.
4. How do you want to write this out? You have lots of options, look at open(),
pickle, shelve for just a few options.
Now try and code something together and if you get stuck we can help. If you
manage to finish it we can help improve it as well.
Ramit
Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423
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Re: [Tutor] python questions about dictionary loops
justin fargus wrote:
Hello,
I'm new to Python. Just started a few weeks ago and I've been learning some
basic things that I would like to put together but I don't even know where
to began. I am trying to do the following:
Make a program using two sentences of about 8 words (total between the two
sentences). I would then like to create a dictionary {} and split the
words of each sentence using one sentence as a dictionary key and using the
other sentence for the dictionary value. I would then like to use a loop
(while or for) that will write out a file that has the dictionary key and
dictionary value to it. How can I go about doing this?
You don't tell us what parts of the problem are causing you trouble. Also, I
don't know if this is homework or not, but a dictionary does not sound like
the right data structure to use here. What happens if the first sentence (the
keys) contains duplicate words?
Here are some examples to get you started. Run them in Python, and see what
they do. They won't solve your problem exactly, but if you study them and see
what they are doing, you should be able to adapt them to solve your problem.
If anything is unclear, please ask.
paragraph = This line has one sentence.\nAnd so does this one.
first_line, second_line = paragraph.split('\n')
print(first_line)
print(second_line)
sentence = this is a sentence of seven words
words = sentence.split()
ordinals = 1st 2nd 3rd 4th 5th 6th 7th.split()
for ordinal, word in zip(ordinals, words):
print(%s :: %s % (ordinal, word))
d = {}
for key, value in zip(['a', 'bb', 'ccc', ''], [1, 2, 3, 4]):
d[key] = value
for k, v in d.items():
print(%s :: %s % (k, v))
Do you need any of this code explained, or is it clear what it does?
--
Steven
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Re: [Tutor] python dictionary and loop
The two sentences I would like to use in the program is the following:
This is line one\nThis is line two! so I write: text_message = This is line
one\nThis is line two!
The dictionary name and key/value pairs will be:
my_sentences {'This':'This','is':'is','line':'line','one':'two'} # Does this
code split the words of each sentence so that the words in sentence 1 are
keys, and the words in sentence 2 are values?
That code does not split anything; it manually hard codes the results you want!
Although the dictionary you show is where each word in sentence one is the key
for the corresponding word in sentence two. Based on your description, I was
thinking
you wanted something more like my_sentences = { 'This is line one': 'This is
line two' }
What happens for 1 sentence or 3 sentences? What if the sentences are not the
same
length? This type of manipulation makes sense for handling tabular data, but
not sure exactly what your use case is...
Ramit
Ramit Prasad | JPMorgan Chase Investment Bank | Currencies Technology
712 Main Street | Houston, TX 77002
work phone: 713 - 216 - 5423
--
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conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.
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