Hi Python tutor, I require help for a script that asks user for number of
rows, r and number of columns c, and generates a r x c matrix with the
following values:
- The value of each element in the first row is the number of the column
- The value of each element in the first column is the number
Hi there,
- I have recently decided to learn Python.
- It is my
first programming language.
- I am new to programming.
- I know XHTML
and CSS, and a few lines of PHP.
- I only started learning a couple of
days ago.
What I want to do is create a simple blog system.
Where
I can
- create posts
Hi,
I'm not a programmer, but I have been exposed to some programming basics.
I've written small parts of console-based C++ programs in an OOP class I
took last year (but nothing outside of the classroom setting), and on my own
I've written some semi-simple multi-form multi-repo
Hi
I've read that the builtin all() function stops evaluating as soon as
it hits a false item, meaning that items after the first false one are
not evaluated.
I was wondering if someone could give an example of where all()'s
short circuiting is of consequence, akin to:
False and produces_side_eff
te is at index 1 and the 2 that was at position 1 is now at
position 0
An alternative is to use a list comprehension, keeping only the
elements that are not 2. As is shown, you can replace the list you are
filtering with the filtered result:
###
>>> b=[2,2,1,1]
>>> b=[x for x in b if not(x==2)]
>>> b
[1, 1]
###
/c
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zero = 0
def turn(self, incr=1):
self._zero+=incr
def __getitem__(self, i):
return self[(i-self._zero)%len(self)]
l=Ring(range(10))
print l
l.turn(5)
print l #same as original
print l[0] #crashes python
###
/c
___
l.turn(3); print l
[3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 0, 1, 2]
>>> >>> l.segment(17,5,3) #start at 17, length of 5, stride 3
[0, 3]
###
This is my first intoduction to the new class modifications...initially
it seems nice to be able to wrap your
learn how to "say things" in
general. Python is a nice language to work with in this regard.
/c
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On Tuesday, Mar 15, 2005, at 05:01 America/Chicago,
[EMAIL PROTECTED] wrote:
how am i going to change the filename automaticaly?
for example:
#every 5 minutes, i am going to create a file based on the
data above
for i in range(100)
output_file = file('c:/output'
0, 1, and 2:
###
>>> j=0
>>> for i in range(10):
.. print j
.. j = (j+1)%3
..
0
1
2
0
1
2
0
1
2
0
###
/c
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e a dramatic time
reduction:
###
import math
big=5
[x for x in xrange(2,big) if not [y for y in
range(2,int(math.sqrt(x)+1)) if x%y==0]]
###
/c
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On Tuesday, Mar 22, 2005, at 05:01 America/Chicago,
[EMAIL PROTECTED] wrote:
I met a similar question.
what if one has L = [[1,2],[3,4]], K = [100, 200]
How to 'zip' a List like [[1,2,100], [3,4,200]]?
I would do something like:
###
for i in range(len(L)):
L[i].append(K[
mum+1,2)
nums[0] = None
for p in nums:
if p:
if p > limit: break
nums[(p*p)//2::p] = [False]*(1+(maximum//p- p)//2)
nums[0] = 2
return filter(None, nums)
###
/c
Hi Sean!
Thanks for your measurements.
In the meantime I did another amendment,
l
A friend recently asked my this didn't modify his original string variable
s1="this is a string"
s1.replace("is a", "is a short")
"this is a short string"
print s1
"this is a string"
After showing him to change it to this
s1 = s1.replace("is a", "is a short")
print s1
"this is a short string"
up to
1,000,000. I'll leave it to someone else to see when it finally blows
up :-) The output of primes was checked through 1,000,000 against
Eppstein's generator without error.
/c
###
def esieve():
'''extended sieve generator that returns primes on each call. When the
end of
sted could do with the same memory.
It's a "tortoise and hare" race as the memory gets chewed up by the
esieve approach.
The ASPN version of Eppstein's program is an older one than the one at
the following site:
http://www.ics.uci.edu/~eppstein/PADS/Er
t exact anyway -- i.e. sqrt(2)
Wish granted in version 2.4 ;-) I don't have it on the mac, but there
is a write-up at
http://www.python.org/doc/2.4/whatsnew/node9.html
The starting blurb says:
"Python has always supported floating-point (FP) numbers, based on the
underlying C double t
are represented
as numbers smaller than their mathematical counterparts:
###
>>> 2.9
2.8999
###
If you have Python 2.4 you might want to check out the decimal type
that is now part of the language. There is a description at
http://www.python.org/doc/2.4/whatsnew/node9.html
wh
. print pi
..
(2, [1, 1])
(3, [1, 2])
(4, [1, 3])
(4, [2, 2])
(5, [2, 3])
(6, [3, 3])
>>>
###
Just a thought,
/c
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>>> time()
1112306900.8461709
###
If you import the whole module, though, and try the same thing...
###
>>> import time
>>> time()
Traceback (most recent call last):
File "", line 1, in ?
TypeError: 'module' object is no
t
>>> [(type(x)==int and [float(x)] or [x])[0] for x in l]
['foo', 0.0]
>>> # ok, that's better
###
/c
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s.extend(si.split())
else:
s.append(si)
print s
###
OUTPUT: ['Hi', 'there', 'Python Tutors', 'please', 'help', 'me']
/c
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? (Does that make sense?)
After searching for "Tim Peters flatten" I was able to find a similar
routine at
http://sourceforge.net/project/
showfiles.php?group_id=87034&package_id=90541&release_id=288585
(It is in the basictypes folder in the latebind.py script by Mike C.
Fletch
een quote marks: in '"this" and "that"' the
entire string will be matched rather than the first "this". The fix is
to use the non-greedy pattern:
re.compile(r'\".*?\"|[^ ]+')
Note the ? after the *
/c
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The one I presented is essentially the same as Fletcher's. Fletcher's
does not actually run through all indices as I thought: as soon as it
steps on an out-of-range index it exits. Fletcher's routine is a
non-recursive version that runs in
into sublists that
are close to 2X your disk capacity would be to generalize the algorithm
to break the numbers into M groups rather than 2 groups...but I'm not
sure how easy that will be.
You're going to love using the karp for this problem :-)
/c
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Which Python version should I download, I have Windows XP and am just
getting started in the programming area so alot of the descriptions are to
confusing for me to understand, anyhelp would be appreciated
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http:
when you are doing print these two characters keep showing up in this book
"%s" %
What do they do?
here is example of complete command.
print "%s" % last_names[-2]
Thank you,
Dave
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Greeting from a real newbie,
I think that their might exist an easy way, in Python, for my list
permutation issue. I need to be able to permute all elements from across
several lists, while ensuring order is maintained across the lists.
For example: list1=[a b] list2=[c d e] list3=[f] list4
I wrote a small Python program to count some simple statistics on a Visual Basic program thatI am maintaining.The Python program counts total lines, whitespace lines, comment lines, Public & Private Subroutines, Public and Private Functions.
The Python program takes about 20-40 seconds to count all
Thus you should probably do: try: fh=open(Onefile, "r") Filecontents =
fh.readlines() # these files are verysmall, # other code here Summary[Onefile] = deepcopy(Stats)# associate each fh.close() except IOError: print("\n
I downloaded py2exe and I thought it was a program that you just browsed
your driver and gave it the .py file and it would do the rest. But I
downloaded it and I cannot figure out how to use it. Please help.
_
Get in the mood for Va
pickle deserialize things that were not serialized by python?
can it convert data into a python data type regardless of it was originally
a 'c array' or something else that python doesn't support?
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pickle deserialize things that were not serialized by python?
can it convert data into a python data type regardless of it was originally
a 'c array' or something else that python doesn't support?
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hi list, i am trying the MIT opencourseware assignments.
one was to find the 1000th prime.
since this isn't actually my homework, I modified the solution as I would
like to collect lists of primes and non-primes up to N, also some log()
ratio to one comparison.
here is what I came up with on paper:
hi list,
i understand the general idea of recursion and if I am following well
written code I can understand how it works, but when I try to write it for
myself I get a bit confused with the flow.
I was trying to turn an ackerman function into python code for practice and
I tried writing it like th
You are thinking of &&
& is what you want
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You will not find much help in getting a program to 'just work' regardless
of your own experience. My advice would be to try and run small parts at a
time to pinpoint where the problem is. Are you opening and reading the file
properly? Are you iterating over the read file properly? Does your html
c
yourlisthere.pop() will return the last element in the list and change the
list so it no longer contains the element. yourlisthere.push(x) will add x
to the end of the list. Works on more than just lists
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To unsubscr
Is the only problem that your code is giving unexpected results, or that it
doesnt run or what?
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It is hard to see things like images and attachments. I think purely html
is preferred, but i would have to look over 'the list rules' again.
You should look into dictionaries as the structure to hold your info.
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To
Would this be a time when regex is necessary? Maybe:
\b[^.]*quarantine[^.]*\.[a-zA-Z]*\b
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how could someone know enough to write their own web-scraping program and
NOT know that this is not about python or how to get around this problem?
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On Mon, Sep 28, 2015 at 1:27 PM, Ken Hammer wrote:
> A simple "type" problem?
>
> The following code works as a py file with the XX'd lines replacing the two
> later "raw_input" lines.
> Why do the "raw_input" lines yield a TypeError: 'str' object is not callable?
> Same result if I use/omit
>
On Mon, Sep 28, 2015 at 4:13 PM, C Smith wrote:
> On Mon, Sep 28, 2015 at 1:27 PM, Ken Hammer wrote:
>> A simple "type" problem?
>>
>> The following code works as a py file with the XX'd lines replacing the two
>> later "raw_input" lines.
>
> Here is my modified version which I think works as you want:
>
> def findMinDepthPath(n):
> if n <= 0: raise ValueError
> elif n==1:
> return 0
> elif n==2 or n==3:
> return 1
> else:
> d1 = findMinDepthPath(n-1)+1
> d2 = d3 = (d1+1) # initialize to
On Sat, Oct 3, 2015 at 11:55 AM, Alan Gauld wrote:
> On 03/10/15 19:10, C Smith wrote:
>>>
>>> Here is my modified version which I think works as you want:
>>>
>>> def findMinDepthPath(n):
>>> if n <= 0: raise ValueError
>>>
On Thu, Nov 24, 2016 at 9:14 PM, urfa jamil wrote:
>
> I need help to write a code for this problem.
>
> Please help
>
>
> Ask the user to enter a series of numbers. Stop reading numbers when they
enter a negative number. Calculate the average of the numbers given not
including the final negative
I'm a student and my university uses Moodle as their learning management
system (LMS). They don't have Moodle Web Services enabled and won't be
enabling it anytime soon, at least for students. The university programs
have the following structure, for example:
1. Bachelor's Degree in Computer Scien
On Mon, Nov 28, 2016 at 11:33 PM, Alan Gauld via Tutor
wrote:
>
> On 28/11/16 21:53, Juan C. wrote:
> > I'm a student and my university uses Moodle as their learning management
> > system (LMS).
>
> Never heard of it but hopefully that doesn't matter :-)
>
On Tue, Nov 29, 2016 at 7:12 AM, Alan Gauld via Tutor
wrote:
> I just noticed the last bit.
> Is this a client side API or a server side API?
> In other words are you building a set of services on the
> server or are you building a module that makes it easy
> for client side programs to access the
On Wed, Nov 30, 2016 at 12:29 AM, Parish Watteau
wrote:
> A program that will read each player’s name and golf score as
> keyboard input, and then save these as records in a file named golf.txt.
> (Each record will have a field for the player’s name and a field for the
> player’s score.)
On Dec 10, 2016 12:15 PM, "Tetteh, Isaac - SDSU Student"
> isaac.tet...@jacks.sdstate.edu> wrote:
> >
> > Hello,
> >
> > I am trying to find the number of times a word occurs on a webpage so I
> used bs4 code below
> >
> > Let assume html contains the "html code"
> > soup = BeautifulSoup(html, "htm
On Mon, Dec 12, 2016 at 2:29 PM, Bryon Adams wrote:
> Is there a way to force my argument to always be a string before entering
> the function?
You could do the following:
1. Use `def ip_checker(ip_address: str):` to make it more clear that
you're expecting a str, but remember, this is just a "h
wn in two situations:
1. No virtualenv
1.a. You only have one Lib/site-packages to hold all your packages
1.b. Project A uses package-abc 1.2 while Project B uses package-abc 1.5
1.c. You go to work on Project B using package-abc 1.5, but later on
you have to do some changes on Project A so you must
You can get python 3.4 to work on your mac, but it has 2.5 or 2.4 which the
OS uses and things can get very messed up if you don't know what you are
doing. You should use virtualbox to run virtual OS's on your mac without
messing up your main computer.
You should probably describe what kind of err
; 3. I calculate the total "probability of failure" of each path (a path may
> have multiple links): Suppose my source node is "a" and destination node is
> "b". I can setup a path between a to b via c or via d (a-c-b or a-d-c):
> Here I will check the risk va
err, set also is unordered. I can see you are using set for a reason, but
has no concept of order.
On Sat, Apr 26, 2014 at 3:20 PM, C Smith wrote:
> Just glancing at your work, I see you have curly braces around what looks
> like it should be a list. If you are concerned with the order o
ere is some other function that can be used to
> display the output in desired order but don't see it possible thats why was
> wondering if any of you Python gurus have any inputs for me :-)
>
>
>
> On Sat, Apr 26, 2014 at 12:36 PM, C Smith wrote:
>
>> err, set also
.split() will split things based on whitespace or newlines. Do you know
that your file is only going to contain things that should convert to
floats? If you post your entire code, the error you have included will be
more helpful as it points to a certain line. The last line in your code has
(stri)
That is definitely more useful information in answering your questions.
Whenever you see the error you are getting:
NameError: name 'smv_guessNumber' is not defined
That means you are using a variable, in this case 'smv_guessNumber', that
has not been created yet.
The reason this is happening he
I should probably clarify that this list is mainly for python2.7, correct
me if I am wrong.
On Mon, Apr 28, 2014 at 1:49 PM, C Smith wrote:
> That is definitely more useful information in answering your questions.
> Whenever you see the error you are getting:
>
> Nam
The reason this is happening here is you need to import sys.
>
I don't know why you would think importing sys would fix this.
docs say it accepts from sys.stdin
On Mon, Apr 28, 2014 at 1:55 PM, Philip Dexter wrote:
>
>
> On Mon, 28 Apr 2014, C Smith wrote:
>
, 2014 at 1:59 PM, C Smith wrote:
>
>
> The reason this is happening here is you need to import sys.
>>
>
> I don't know why you would think importing sys would fix this.
>
> docs say it accepts from sys.stdin
>
>
> On Mon, Apr 28, 2014 at 1:55 PM,
The first loop tests for the last element of fullPath to have today's date.
The second loop tests the first element in fullPath, if it is not today,
you will end up running sys.exit() when you hit the else clause in second
loop.
On Fri, May 2, 2014 at 6:38 PM, C Smith wrote:
> The fi
I had always assumed that append() was more efficient, but some recent
discussions seem to point at that it is the same as append(). Which is
preferable and why?
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Sorry.
I meant for example:
list1 = [1,2,3]
list2 = [3,4,5]
newList = list1 + list2
versus
for x in list2:
list1.append(x)
Which is the preferred way to add elements from one list to another?
On Sun, May 4, 2014 at 7:36 AM, Dave Angel wrote:
> C Smith Wrote in message:
>>
&
Hey, you will want to include some code to show your progress so far.
Can you write a basic program and then work the requirements into it?
Do you have some idea of where to start? Are you supposed to modify a
completed version of "hangman" that is in your text, or come up with
an original 'hangman
>ordered_keys = word_count.keys()
>sorted(ordered_keys)
sorted() does not modify the list, but returns a sorted version of the
list for me on Python 2.7
my_sorted_list = sorted(ordered_keys)
This will alphabetize all of the words, regardless of frequency.
>print ("All the words and their frequenc
ode, pseudo code,worries about
> using Dictionaries,Lists.embedded while lists,for loops:
> Thank you,. C. Smith for responding to my help plea on Python-Tutor.org. One
> version of the "Hang Man" problem is listed in the textbook,but it doesn't
> use Dictionaries,Lists,embedded w
A topic came up on slashdot concerning "intermediate" programming,
where the poster expressed the feeling that the easy stuff is too easy
and the hard stuff is too hard.
Someone did point out that 'intermediate' programming would still
involve actually selling code or at least some professional
ex
eturn (or reaches the end of its body), the
> for loop ends.
>
> This is called a generator function, and is a really nice way to
> simplify and optimize your loops.
>
> You can read more about generators here:
> https://wiki.python.org/moin/Generators
>
>
> On Wed,
I guess intuiting efficiency doesn't work in Python because it is such
high-level? Or is there much more going on there?
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Hey Glen, include the error you are getting. It will make answering
your question easier. How are you running this program, in an IDE?
On Sat, May 10, 2014 at 11:16 PM, Glen Chan wrote:
> Hello, I am a student trying to figure out Python. I am getting errors that
> I don't know how to fix. What d
I have never known anyone that works in this industry. I got one job
transforming xml (should have used xslt, ended up using sed and python
regex scripts) where the guy asked me how much I wanted and I threw
200 bucks out there because I could get a room for two weeks at that
cost. He just laughed
to the industry.
>
> If you want to pursue a career in IT, you need to finish high school. You
> would be wise to get a degree.
>
> My $0.02.
>
> Tim
>
>
> On Sun, May 11, 2014 at 7:12 PM, C Smith
> wrote:
>>
>> I have never known anyone that works i
Thanks to everyone.
>> practice. That programming doesn't have to be a solitary thing needs
>> to be strongly emphasized, because the media likes to exaggerate,
>Yes, This can't be stressed too much. Industrial coding is a team activity not
>a solo process.
This is particularly good advice for
Freeside is more makers. I haven't gone but have known people that
have. You might find some arduino supposedly, but not much coding
otherwise and you have to pay membership fees. It is more social than
technical, I think. And your car will probably be broken into. I will
check out the python-atlan
I think that is going to be my new wallpaper.
On Mon, May 12, 2014 at 8:25 PM, Martin A. Brown wrote:
>
> Hello,
>
> 10 Pick one favorite specific topic, any topic (XML parsing; Unix
> process handling; databases). The topic matters for you.
> Learn it deeply. Keep learning it. The
That looks pretty normal. I don't see any errors.
On Wed, May 14, 2014 at 5:42 AM, Tao Zhu wrote:
> Hi everyone,
> when I use python, the problem occured. when I used the command "python -v",
> the results are listed as follows. could you tell me what wrong?
>
> $ python -v
> # installing zipimpo
What are you trying to do?
On Wed, May 14, 2014 at 12:24 PM, C Smith wrote:
> That looks pretty normal. I don't see any errors.
>
> On Wed, May 14, 2014 at 5:42 AM, Tao Zhu wrote:
>> Hi everyone,
>> when I use python, the problem occured. when I used the command "
This might be useful for reading values from a text value into a dictionary:
https://stackoverflow.com/questions/17775273/how-to-read-and-store-values-from-a-text-file-into-a-dictionary-python
On Wed, May 14, 2014 at 7:00 PM, Danny Yoo wrote:
>> Program read TXT file (c:\\slo3.txt)
>
You can test out a condition like this in IDLE like so:
while 6:
print "yes its true"
break
while 0:
print "yes its true"
break
while -1:
print "yes its true"
break
emptyList = []
while emtpyList:
print "yes its true"
break
This way you don't have to deal with
Of course that isn't very useful code. I thought it might be a useful
quick test for someone learning how while loops treat different
values.
On Tue, May 20, 2014 at 2:46 PM, Danny Yoo wrote:
> On Tue, May 20, 2014 at 11:44 AM, C Smith
> wrote:
>> You can test out a condition
Sorry, typing is hard.
*You will need to use virtualenv
On Thu, May 22, 2014 at 2:40 PM, C Smith wrote:
> You can't use apt-get or similar to install 3.1.
> You will need to virtualenv.
>
> On Thu, May 22, 2014 at 12:22 PM, Alex Kleider wrote:
>> On 2014-05-22 06:17, M
You can't use apt-get or similar to install 3.1.
You will need to virtualenv.
On Thu, May 22, 2014 at 12:22 PM, Alex Kleider wrote:
> On 2014-05-22 06:17, Markos wrote:
>>
>> Hi,
>>
>> I'm learning Python and I'm using Debian 6.0 (squeeze)
>>
>> The installed version is 2.6.6. (python -V)
>>
>> I
Learning Python Design Patterns, by Gennadiy Zlobin
Let us know when your book is done!
On Mon, Jun 30, 2014 at 7:05 AM, Bob Williams
wrote:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> On 29/06/14 23:41, Alan Gauld wrote:
>> I'm looking for tips for an appendix to a book that I'm workin
I agree very much. I feel like I might have a learning disability when
I try to reference the official Python docs for something that seems
like it should be a very common task.
On Sat, Jul 5, 2014 at 1:31 PM, Deb Wyatt wrote:
> I am betting that a big reason newbies don't go straight to document
I am on OSX, which needs to escape spaces in filenames with a backslash.
There are multiple files within one directory that all have the same
structure, one or more characters with zero or more spaces in the
filename, like this:
3 Song Title XYZ.flac.
I want to use Python to call ffmpeg to convert
passed to the shell
without escaping the spaces.
>Why not using ffmpeg without jumping into Python. It's well documented, check
>Google.
I guess you mean that the ability to change multiple files with ffmpeg
is possible. I hadn't considered that but I would rather do it with
Python,
e Python interpreter strip off backslashes or something with strings?
On Thu, Jul 31, 2014 at 5:53 PM, C Smith wrote:
>>Change:
>
>
>>subprocess.call(['ffmpeg', '-i', filename, str(track)+'.mp3'])
>
>>to:
>
>>subprocess.call(['ffmpeg
Okay I messed up with slash instead of backslash, so the re.sub()
works, but I am still curious about the previous question.
On Thu, Jul 31, 2014 at 6:14 PM, C Smith wrote:
> Even when I am using:
> re.sub('/s', '\\/s', filename)
> I am still getting the same outp
. So, I
am still wondering about that too.
On Thu, Jul 31, 2014 at 6:20 PM, C Smith wrote:
> Okay I messed up with slash instead of backslash, so the re.sub()
> works, but I am still curious about the previous question.
>
> On Thu, Jul 31, 2014 at 6:14 PM, C Smith wrote:
>> Ev
> emails are coming in slowly and out of order, but I have a suggestion:
>
> On Thu, Jul 31, 2014 at 03:53:48PM -0400, C Smith wrote:
>> I am on OSX, which needs to escape spaces in filenames with a backslash.
>
> Same as any other Unix, or Linux, or, indeed, Windows.
>
>
woops, I see it pathname != filename
On Thu, Jul 31, 2014 at 6:55 PM, C Smith wrote:
>>for track, filename in enumerate(os.listdir(directory), 1):
> It seems kinda counter-intuitive to have track then filename as
> variables, but enumerate looks like it gets passed the filename
Works now, thanks!
On Thu, Jul 31, 2014 at 6:57 PM, C Smith wrote:
> woops, I see it pathname != filename
>
> On Thu, Jul 31, 2014 at 6:55 PM, C Smith wrote:
>>>for track, filename in enumerate(os.listdir(directory), 1):
>> It seems kinda counter-intuitive to hav
Huh, that is quite an annoyance about changing the order though. Any
ideas about that? I will look into it further in the meantime...
On Thu, Jul 31, 2014 at 6:57 PM, C Smith wrote:
> Works now, thanks!
>
> On Thu, Jul 31, 2014 at 6:57 PM, C Smith wrote:
>> woops, I see it pathn
thanks, got it
import os, subprocess, re
directory = 'abs/path'
for track, filename in enumerate(os.listdir(directory), 1):
pathname = os.path.join(directory, filename)
subprocess.call(['ffmpeg', '-i', pathname, filename+str(track)+'.mp3'])
On Thu,
or more accurately
import os, subprocess, re
directory = '/abs/path'
for track, filename in enumerate(os.listdir(directory), 1):
pathname = os.path.join(directory, filename)
subprocess.call(['ffmpeg', '-i', pathname, filename[:-5]+'.mp3'])
On Thu,
wrote:
> C Smith wrote:
>
> I'd throw in a check to verify that filename is indeed a flac:
>
>> or more accurately
>> import os, subprocess, re
>> directory = '/abs/path'
>> for track, filename in enumerate(os.listdir(directory), 1):
>&
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