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Thread Rules 1. This is not a "do my homework for me" thread. If you have specific questions, ask, but don't post an assignment or homework problem and expect an exact solution. 2. No recruiting for your cockamamie projects (you won't replace facebook with 3 dudes you found on the internet and $20) 3. If you can't articulate why a language is bad, don't start slinging shit about it. Just remember that nothing is worse than making CSS IE6 compatible. 4. Use [code] tags to format code blocks. | ||
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Mr. Wiggles
Canada5894 Posts
from collections import Counter The above doesn't require that you sort the list (or that it's already sorted). Assuming Counter() is implemented efficiently, it should run in O(n). Reference: https://docs.python.org/3/library/collections.html#collections.Counter | ||
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Deleted User 3420
24492 Posts
So I looked it up and they do exist? But it seems that unlike java, they are not a requirement. so, separate .py files are "modules", which you can import and use in other python files? It seems like modules in python are a lot like upper level classes in java. But classes in python are also similar to classes in java in that you instantiate them? Is that the actual purpose of classes in python? Object instantiation? (or I guess more specifically, defining new types of objects for instantiation) Also in python if I define a variable at the class level, this variable isn't global, right? It needs to be at the level above that? | ||
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Acrofales
Spain17971 Posts
Scoping in Python is pretty simple and described in the manual, but here's a SO answer that lifts the right part from the manual: http://stackoverflow.com/questions/291978/short-description-of-scoping-rules | ||
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Deleted User 3420
24492 Posts
I want a global variable, let's call it myWord. I want a function that modifies myWord. let's call it myFunction so my python file could look like
this is basically what I am trying to do. But python doesn't like this. it tells me I need to define(initialize?) the global variable within the function But that's what I don't understand! if I do that, if I say myWord = "" in my function, then what I am trying to do will be reset every time I run the function! Also why the heck would I need to initialize it in there anyways, isn't the entire point that it's a global variable and it was created at the global level? | ||
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Acrofales
Spain17971 Posts
On January 11 2017 00:52 travis wrote: I am so confused about global variables. I am told this should be intuitive but I don't understand how to do something. I want a global variable, let's call it myWord. I want a function that modifies myWord. let's call it myFunction so my python file could look like
this is basically what I am trying to do. But python doesn't like this. it tells me I need to define(initialize?) the global variable within the function But that's what I don't understand! if I do that, if I say myWord = "" in my function, then what I am trying to do will be reset every time I run the function! Also why the heck would I need to initialize it in there anyways, isn't the entire point that it's a global variable and it was created at the global level? Works just fine for me... you sure you don't have some other code cluttering up your file? | ||
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Deleted User 3420
24492 Posts
On January 11 2017 01:34 Acrofales wrote: Works just fine for me... you sure you don't have some other code cluttering up your file? oh wow really? well here is the actual code (im still playing that code challenge solving game, it's pretty fun)
here is the error it gives
line 18 is: result = result + thisString[i-1] | ||
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mantequilla
Turkey779 Posts
On January 11 2017 00:52 travis wrote: I am so confused about global variables. I am told this should be intuitive but I don't understand how to do something. I want a global variable, let's call it myWord. I want a function that modifies myWord. let's call it myFunction so my python file could look like
this is basically what I am trying to do. But python doesn't like this. it tells me I need to define(initialize?) the global variable within the function But that's what I don't understand! if I do that, if I say myWord = "" in my function, then what I am trying to do will be reset every time I run the function! Also why the heck would I need to initialize it in there anyways, isn't the entire point that it's a global variable and it was created at the global level? did you jump to python from java :D what about not using global variables? more than often they are an antipattern. | ||
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Acrofales
Spain17971 Posts
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Silvanel
Poland4725 Posts
as expected it prints more words to terminal And as pointed out in Your code "result" isnt global. It is local to "def recall_password" function. | ||
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Deleted User 3420
24492 Posts
thanks guys i forgot that the entire block of code was put in the website's function (def recall_password(cipher_grille, ciphered_password)  On January 11 2017 01:45 mantequilla wrote: + Show Spoiler + On January 11 2017 00:52 travis wrote: I am so confused about global variables. I am told this should be intuitive but I don't understand how to do something. I want a global variable, let's call it myWord. I want a function that modifies myWord. let's call it myFunction so my python file could look like
this is basically what I am trying to do. But python doesn't like this. it tells me I need to define(initialize?) the global variable within the function But that's what I don't understand! if I do that, if I say myWord = "" in my function, then what I am trying to do will be reset every time I run the function! Also why the heck would I need to initialize it in there anyways, isn't the entire point that it's a global variable and it was created at the global level? did you jump to python from java :D what about not using global variables? more than often they are an antipattern. I don't know how to design my program in a way where I don't have to use global variables  | ||
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phar
United States1080 Posts
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Manit0u
Poland17244 Posts
On January 11 2017 02:09 phar wrote: Return more things is one quick and easy way generally(which in Python is pretty easy). Yeah, the ability to return more than one thing from a Python function has always amazed and baffled me at the same time. | ||
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RoomOfMush
1296 Posts
On January 11 2017 04:19 Manit0u wrote: Yeah, the ability to return more than one thing from a Python function has always amazed and baffled me at the same time. How? | ||
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mantequilla
Turkey779 Posts
not my cup of tea though. Better return a well defined object | ||
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RoomOfMush
1296 Posts
Returning one object is just as good as returning many. If worst comes to worst return an array of objects. Not a clean solution by any definition but 100% functional. | ||
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Silvanel
Poland4725 Posts
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spinesheath
Germany8679 Posts
On January 11 2017 17:06 Silvanel wrote: Since i know only python i have to ask. Which langauges limit function to returning one item? Most popular languages only have single return values, as far as I know. That single value still can be a tuple or (reference/pointer to) anything you want though. | ||
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teamamerica
United States958 Posts
On January 11 2017 17:06 Silvanel wrote: Since i know only python i have to ask. Which langauges limit function to returning one item? This whole discussion is confused because without defining what an "item" is it's meaningless.
You're still returning one item, the item just happens to be a container. Python has some syntactic sugar around creating tuples and destructing tuples, such that if you have a collection of N items on rhs of assignment, you can assign it to [x0..xN) variables on the left hand side. Other languages have more advanced pattern matching, e.g. any trivial haskell example that matches (x:xs) on a list. You can work around the lack of tuples in Java with a tuple object, but you can't do the variable destructing on the return value such that you assign multiple variables to the items of your collection in one line. Go is a language where you can really return multiple values as a special quirk of the language, where you're not returning a tuple. They trade off making multiple returns a special case for saving complexity of implementing tuples + maybe language designers just don't like them. | ||
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Manit0u
Poland17244 Posts
How do I set my cascades properly so that when I delete A all of B and C are also removed? Right now I'm getting an error that C can't be deleted because it's still referenced by A... | ||
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Acrofales
Spain17971 Posts
On January 11 2017 18:46 Manit0u wrote: I have a bit of a problem with the DB:
How do I set my cascades properly so that when I delete A all of B and C are also removed? Right now I'm getting an error that C can't be deleted because it's still referenced by A... Looks like you created a deadlock situation. Change the restrictions on your DB, or accept that there will be undeletable entries. Your only other option is a hack where you add a C called "tobedeleted" or something, and change A to belong to that first, then cascade your delete. | ||
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