14 replies to this topic

[~*DK*~]

done

Spoiler

I'm in a big rush I got a python homework due tonight haha. sucks for me.I was wondering if anyone could lend a big hand:

i was wondering if someone could help me understand on how to save files with python, and load them.

so i have got this code on how to add names into a "phonebook"
but how can i allow the user to save it as a text file after entering the information

phone_book = {}
inverse_phone_book = {}

def add_numbers_to_phone_book():
    to_add = int(input('How many numbers do you \
want to add? '))
    for number in range(to_add):
        key = input('What is the name of the person? ')
        item = input('What is the number of that person? ')
        phone_book[key] = item

    
def reverse_phonebook():
    for key in phone_book:
        value = phone_book[key]
        last = []
        last.append(key)
        if value in inverse_phone_book:
            inverse_phone_book[value].append(key)
        else:
            inverse_phone_book[value] = last

old useless info

Spoiler

first assignment: http://nlp.cs.nyu.ed...-2011/Xtra.htmlslides 14-18 here: http://cs.nyu.edu/co...-004/index.html* i don't exactly know how to do thissecond assignment: http://nlp.cs.nyu.ed...-2011/HW10.htmlthe sources we used: http://cs.nyu.edu/co...04_phonebook.py*I'll start working on this.** one doneIf you guys play neopets, I can give you a couple older neopet shells I have created and rarely used. Or I can shed out some neopoints I got from imageclick on my old accounts.thank you ahead of time!!!my msn is:[email protected] u guys can also get some free pdfs by visiting here: http://colorfulsharp...om/Locked/menu/ logged in using the username and password

Edited by ~*DK*~, 04 May 2011 - 07:05 PM.

[Hydrogen]

What exactly are you looking for us to help you with? We're not going to do your homework for you . At least, I won't .

How did you get into this situation anyway?

[Pyro699]

why don't you summarize things for us so we have a want to help Cause ill help in a specific area, but im not going to put much work into it.

[Waser Lave]

Nobody is going to do your homework for you, we're here to help with specific problems.

What exactly are you looking for us to help you with? We're not going to do your homework for you . At least, I won't .

How did you get into this situation anyway?

why don't you summarize things for us so we have a want to help Cause ill help in a specific area, but im not going to put much work into it.

[ilovepolkadots]

What Does Extra Credit Mean?

• This is not a normal homework, is not required in any way and doing this assignment cannot have any negative impact on your grade.

Edited by ilovepolkadots, 04 May 2011 - 09:17 AM.

[~*DK*~]

*how i got into this situation:

1. Wrote a 12 page paper on Lenin, Marx, Rousseau, Freud, and Fanon and how they relate to the crisis of modernity
2. did not understand how to do homework 10


for homework 8, we are supposed to add "er" to the end of words, i wrote the best I could, but it seems to add er to the end of the words such as "hi" -> "hiier" and various others
source for hw 8:

def add_er(string):
#    if ((string[-1] in ['b','d','g','l','m','n','p','r','s','t']) and\
#        (string[-2:] in ['a','e','i','o','u'])):
#        return(string+'er')
   
    if (string[-1] == 'y'):
        return(string[:-1]+'ier')

    #exceptions to these rules. if the word ends in "eat" then you don't add another consonant
    if (string[-1] == 't' and string[-2] == 'a' and string[-3] == 'e'):
        return(string+'er')
    
    elif (string[-1] == 'e'):
        return(string+'r')

    elif (len(string)<2 or
        (string[-1] in ['b','d','g','l','m','n','p','r','s','t']) or
        (not(string[-3:] in ['a','e','i','o','u']))):
        return(string+string[-1]+'er')
    
    else:
        return(string+'er')

I'll start doing the extra credit in a bit. I guess i'll come back and edit this post with more of my own work and ask for help based from there

[Pyro699]

What would the output you expect to see? because you cannot add er to hi, unless you meant higher... in which case you should be using high and not hi More context / examples / experted output would be nice XD

Also For your exception in regarding eat.... that is very ugly -.-

if string[-3:] == "eat"

[Waser Lave]

What would the output you expect to see? because you cannot add er to hi, unless you meant higher... in which case you should be using high and not hi More context / examples / experted output would be nice XD

Also For your exception in regarding eat.... that is very ugly -.-

if string[-3:] == "eat"

Isn't there also an endswith method?

[Pyro699]

I think so, but the endswith method would call the __getslice__ method, which essentially [start:end]... so this is quicker and more efficient.

Heres a little more help for you ;p

>>> dir("")

['__add__', '__class__', '__contains__', '__delattr__', '__doc__', '__eq__', '__format__', '__ge__', 

'__getattribute__', '__getitem__', '__getnewargs__', '__getslice__', '__gt__', '__hash__', '__init__', 

'__le__', '__len__', '__lt__', '__mod__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', 

'__repr__', '__rmod__', '__rmul__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 

'_formatter_field_name_split', '_formatter_parser', 'capitalize', 'center', 'count', 'decode', 'encode', 

'endswith', 'expandtabs', 'find', 'format', 'index', 'isalnum', 'isalpha', 'isdigit', 'islower', 'isspace', 

'istitle', 'isupper', 'join', 'ljust', 'lower', 'lstrip', 'partition', 'replace', 'rfind', 'rindex', 

'rjust', 'rpartition', 'rsplit', 'rstrip', 'split', 'splitlines', 'startswith', 'strip', 'swapcase', 

'title', 'translate', 'upper', 'zfill']

[Hydrogen]

I think so, but the endswith method would call the __getslice__ method, which essentially [start:end]... so this is quicker and more efficient.

Not really quicker or more efficient. Just makes the code harder to read and maintain.

[Pyro699]

Not really quicker or more efficient. Just makes the code harder to read and maintain.

Instead of it calling
string -> endswith -> __getsplice__
its going
string -> __getsplice__

and it is much easier to read if you know how to read python properly.

Just another area for us to disagree on eh hydro

[Waser Lave]

Instead of it calling
string -> endswith -> __getsplice__
its going
string -> __getsplice__

and it is much easier to read if you know how to read python properly.

Just another area for us to disagree on eh hydro

The difference in speed would be minuscule, the benefits of readability would far outweigh that.

[Pyro699]

The difference in speed would be minuscule, the benefits of readability would far outweigh that.

I agree, but its a good practice to maintain. If he was running through a list of 1million words, it would build up a few seconds over time...

[Waser Lave]

I agree, but its a good practice to maintain. If he was running through a list of 1million words, it would build up a few seconds over time...

But they aren't, so it won't.

[Hydrogen]

I agree, but its a good practice to maintain. If he was running through a list of 1million words, it would build up a few seconds over time...

Generally, algorithmic optimization is a much more powerful source of speed improvements than avoiding an extra function call. You should always err on the side of readability. You or someone else will be maintaining the code in the future. Do yourself and others a favor and make it easier on everyone to do their job. Difficult to maintain code is more bug prone. People don't care how fast your program is if it doesn't work properly.