Jonnty posted:

There are lots of options, depending on how you're doing things.

code:

for line in lines:
  if line < 8:
    pass

for line in lines[8:]:
  #stuff

That last one's called a list slice if you want to look it up by the way.

Hughmoris posted:

sund posted:

You'll need to use enumerate() if you want to do it that way, because "line" isn't the index of the line, it refers to the line itself. Here you are with slicing:

code:

myMovies = open('movieList.txt','r')
for line in myMovies[8:]:
    print line

sund posted:

You'll need to use enumerate() if you want to do it that way, because "line" isn't the index of the line, it refers to the line itself. Here you are with slicing:

code:

myMovies = open('movieList.txt','r')
for line in myMovies[8:]:
    print line

sund posted:

You'll need to use enumerate() if you want to do it that way, because "line" isn't the index of the line, it refers to the line itself. Here you are with slicing:

code:

myMovies = open('movieList.txt','r')
for line in myMovies[8:]:
    print line

Jonnty posted:

whoops, I'm thick. Sorry Hughmoris!

Hughmoris posted:

No worries, its the thought that counts! Thanks for input Lonely Wolf, I'll give it a shot when I get off work today. Since you're all so helpful, I have another question. I posted this in the Linux thread but perhaps there is an easier way to do it in Python.

I'm working on my first project which is a little script that will gather the names of DVDs being released that week and send those names to be in an email. I have figured out how to pull the names from the website and put them in a text file but I'm a bit clueless on how to automate an email with the names in the body of the message. I have one computer running Linux Mint 8 and another running Windows XP. I have a Gmail address and an email address through my ISP.

Any suggestions on how to best tackle the email issue, assuming I have no knowledge beyond using webmail or Outlook.

Hughmoris posted:

No worries, its the thought that counts! Thanks for input Lonely Wolf, I'll give it a shot when I get off work today. Since you're all so helpful, I have another question. I posted this in the Linux thread but perhaps there is an easier way to do it in Python.

Sweeper posted:

Can somebody explain how this works to me? Why doesn't it create a new list for the default argument on every call?

code:

class Test(object):
    """docstring for Test"""
    def __init__(self, myList=list()):
        super(Test, self).__init__()
        self.myList = myList
        
a = Test()
a.myList.append(3)
print "a before:", a.myList

b = Test()
b.myList.append(2)

print "a after:", a.myList
print "b after:", b.myList

output:

code:

a before: [3]
a after: [3, 2]
b after: [3, 2]

http://codepad.org/luFDMwEy

tripwire posted:

I think its due to the way keyword arguments work. When you are supplying a value for a default keyword argument, that value is used for all future calls of the function.

Like if you had

code:

def foo(arg = "default value" ):
    pass

The string "default value" is only created once, and that one instance is passed for all future invocations of foo.

You probably want something this:

code:

class Test(object):
    """docstring for Test"""
    def __init__(self, myList=None):
        super(Test, self).__init__()
        self.myList = [] if myList == None else myList
        
a = Test()
a.myList.append(3)
print "a before:", a.myList

b = Test()
b.myList.append(2)

print "a after:", a.myList
print "b after:", b.myList

Sweeper posted:

I figured it was something about default arguments only being created one. Is that a design decision? Is there a reason to create them only once vs. creating it every time?

tripwire posted:

Im pretty sure its designed that way on purpose. I could be wrong but I'd imagine default values sit outside of the function for efficiency- if a default argument had to be created every time a function was invoked, thered be way too much overhead.

deichkind42 posted:

Ok, does anyone know how to properly write windows filenames in python 2.7?

I've tried target_dir = r"d:/pythonbackup/" but that fucks everything up.
I need a detailed explanation because i have been googling this for 20 minutes and all the explanations on the web fail on my machine for some reason. :/

I've also tried double backslashes like "C:\\backup\\" but that just gives out a windows error that it can't find the dir (probably because of the double backslashes)

tef posted:

code:

>>> x = range(1,11)
>>> x
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>> zip(x[:], x[1:], x[2:])
[(1, 2, 3), (2, 3, 4), (3, 4, 5), (4, 5, 6), (5, 6, 7), (6, 7, 8), (7, 8, 9), (8, 9, 10)]

oiseaux morts 1994 posted:

I have some software I use for work that depends on Python 2.x, but I want to do some stuff with 3.x for my own personal ends, is there a way I have have both installed concurrently, and choose which one to use?

Kire posted:

Can someone please tell me how to get Notepad++ to run a python file?

I have program.py and even when I hit f5 in Notepad++, all it does is ask me to locate a file (instead of running the file I have open like IDLE), and when I select "program.py" a cmd window just blinks in and out, nothing happens. This is on WinXP.

leterip posted:

Very nice. This is a version that generalizes to any n:

code:

>>> x = range(1, 11)
>>> n = 3
>>> zip(*(x[i:] for i in xrange(n)))
[(1, 2, 3), (2, 3, 4), (3, 4, 5), (4, 5, 6), (5, 6, 7), (6, 7, 8), (7, 8, 9), (8, 9, 10)]

Hughlander posted:

Is there a genericish template system like you'd find in Django in the standard library? What I'm looking to do is:
1) Read in a Key/Value pair text file where not all known keys will be specified.
2) Read in a template file.
3) Write out an instance of the template based on what was read in 1/2 IE:

Data:
FirstName = Bob
Title = Your uncle


{% if FirstName %}
Hello {{ FirstName }}
{% else %}
Dear Anonymous
{% endif %}

(Note I'm using Django's template language just 'cuz that's what I'm thinking of ATM but it doesn't need to look like it as long as it can have conditional blocks.)

I'd like to build/deploy the whole thing with IronPython and have it in a large source control project without any external dependences if possible...

Is there anything like this?

Hughlander posted:

Is there a genericish template system like you'd find in Django in the standard library? What I'm looking to do is:
1) Read in a Key/Value pair text file where not all known keys will be specified.
2) Read in a template file.
3) Write out an instance of the template based on what was read in 1/2 IE:

Lurchington posted:

I googled around and Tempita seems to be on topic at least

Lurchington posted:

Alright, I have an in-person technical interview for a python development job, and it's my first one ever really (I've been doing project management for the last 6 years).

It hasn't been stated, but I think I'd be working with Django and probably relational databases of one kind or another.

Those of you who've done a python dev tech interview, were there any good resources that you thought helped prepare you? Or alternatively, anything non-job specific you had to think harder about besides "what are list comprehensions?" I know I'll be whiteboarding something during the interview, and although I'm confident, it'd be silly to not refresh some things.

edit:

So far, I'm going to be brushing up on multiprocessing vs. threads, along with the Global Interpreter Lock

edit2:

VVV I've name dropped the big libraries I've used before, so yeah, I need to make sure I'm clear there. You also mentioned some I haven't used so that's a point.