🌐 Mailman 3 October 2003 - Tutor - python.org

Backslashes inside of variable
by Phoebus Nov. 24, 2003

Nov. 24, 2003

I am running Python 2.2 on Win2k. I have a program which writes a filename, with backslashes to a file, along with other stuff. I read the file in using readlines() and put each line into a variable. My problem is I want to use the filename, but I can't use it because of the backslashes. I know about doing open(r"d:\test\file.txt","w") or even open(`d:\test\file.txt`,"w"), but the filename is inside of a variable so when I do open(filename,'w'), I have problems. Can anyone help? Thanks, Steve --

4 6

Problem with variables
by docnova Nov. 5, 2003

Nov. 5, 2003

This program is my first intended project. This program(upon completion) will give a complete (too my limited knowledge) numerology reading upon the input of the users name and birthday. There are several problems that I need to figure out how to address. The first (and biggest) is the inuput of the users name. In numerology the one of the core numbers is acheived by adding each letter of the users full name together. As of now the only solution is for the user to enter the name as such "J+O+H+N+S+M+I+T+H". The ideal scenario would be for "John Smith" to be translated into "J+O+H+N+S+M+I+T+H" How would I make this action possible? Here is the source i have so far: #This program will give a complete numerology rating :) #Each letter represents a number. Each letter is given its proper value. a=1; A=1 b=2; B=2 c=3; C=3 d=4; D=4 e=5; E=5 f=8; F=8 g=3; G=3 h=5; H=5 i=1; I=1 j=1; J=1 k=2; K=2 l=3; L=3 m=4; M=4 n=5; N=5 o=7; O=7 p=8; P=8 q=1; Q=1 r=2; R=2 s=3; S=3 t=4; T=4 u=6; U=6 v=6; V=6 w=6; W=6 x=6; X=6 y=1; Y=1 z=7; Z=7 print "Welcome" print "This program will give you a complete numerology rating :)" name = raw_input("Please enter your full name (first, middle, last): ") print "Hello there", name +"."

2 1

binary_read?
by Karshi F.Hasanov Nov. 5, 2003

Nov. 5, 2003

Hi all, I am trying to read a binary file using python's "read" method. Here how it starts file: '@\xe0\x00\x00\x00\x00f\x00\x00326112\x0010/17/103\x0022:20 \x00\x00\x00GE_MED_NMR\x00\x01\x00\x00\x00\x02\x00\x03\x00 \x0b\x00\x10\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x01\x00;\x00 \x02\x00\x01\x01\x00\x00\x08\x00\x00\x01\x00\x00\x02\x00\x01\x00\x01?\x80 \x00\x00?\x80\x00\x00\x00\x01\x00\x01\x00\x00\x01\x00\x01\x01\x01\x00\x01\x00 \x01\x00\x00\x00\x00\x00\x01\xd9\xd8\x00\x00\x00\x00\x00\x00\x00\x00\x00C\x00\x00\x00A Steps: 1. f=open("Binary_file", 'rb') 2. r=f.read(512) 3.s=fromstring(r,'f'') ( also tried different fomating codes) I am not getting it right!!! Can you tell me where I am wrong? Thanks

2 1

Coin toss program
by LONG, SPENCER Nov. 5, 2003

Nov. 5, 2003

Hello, I'm having difficulty writing code for the following end of chapter exercise: "Write a program that flips a coin 100 times and then tells you the number of heads and tails." Can anyone forward to this Newbie the code for how this is accomplished? So far I have code that flips the coin once (using a random number generator), which results in either a heads or tails. But again, it's a single flip of the coin. Thanks, Spencer

3 2

invalid literal for float int or long solved !
by tpc＠csua.berkeley.edu Nov. 5, 2003

Nov. 5, 2003

fingers crossed, here's hoping the bug doesn't rear its creepy head again, can't really say wherefore the bug but I found a workaround, I changed the basic MySQL statement below: SELECT url, title FROM URLs, URLs_WITH_MATCHES WHERE URLs.id = URLs_WITH_MATCHES.url_id; to: SELECT title, url from URLs INNER JOIN URLs_WITH_MATCHES ON URLs.id = URLs_WITH_MATCHES.url_id; and voila ! I am a complete idiot.

2 3

Importing from classes or functions
by Daniel Ehrenberg Nov. 3, 2003

Nov. 3, 2003

I'm trying to write a module to make it so that you can use Ruby-style methods on various types in Python (similar to the methods on strings, but in Ruby, *every* method that would be builtin or in the standard library is callable from that variable). I'm starting with an integer where, if you call the sin() function, it returns the sine of the number. I called this class (for right now) sinnum. So sinnum(5).sin() should return -0.95892427466313845. I was able to impliment it, but I had do import math outside of the class. I wanted to import it within the class, since when I'm finished, the module should contain more than one datatype (an extended int, an extended float, an extended string, etc). But when I try to impliment importing within the class, the import doesn't work. >>> class sinnum(int): ... def __init__(s, number): ... import math ... s.num = number ... def sin(s): ... return math.sin(s) ... >>> x = sinnum(5) >>> x.sin() Traceback (most recent call last): File "<input>", line 1, in ? File "<input>", line 6, in sin NameError: global name 'math' is not defined I was able to simplify my error to this, if it helps: >>> def importmath(): ... import math ... >>> importmath() >>> math.sin(5) Traceback (most recent call last): File "<input>", line 1, in ? NameError: name 'math' is not defined If Ruby-style methods for Python is a bad idea or would be extremely inefficient, please tell me. Daniel Ehrenberg __________________________________ Do you Yahoo!? Exclusive Video Premiere - Britney Spears http://launch.yahoo.com/promos/britneyspears/

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test if file is not ascii
by Paul Tremblay Nov. 2, 2003

Nov. 2, 2003

Is there any relatively fast, easy way to test if a file is not ascii? I have written a script that converts RTF to XML. An RTF file should be ascii encoded. If not, it will result in invalid XML. It would be nice to test the file before the conversion begins to tell the user "Sorry, but this file is not valid RTf." Thanks Paul -- ************************ *Paul Tremblay * *phthenry(a)earthlink.net* ************************

5 7

Determining systems maximum float value
by Marc Barry Nov. 1, 2003

Nov. 1, 2003

Dear All: This is a rather simple question (perhaps) and I have searched the archives and haven't found an answer for it. Basically, I want to know how to determine the maximum supported float value of the underlying system that the Python interpreter is running on. I know that floats are implemented using double in C and thus their maximum value depends on the system. For example, python has a function in module 'sys' that gives the maximum integer value: #----- import sys print sys.maxint #----- How can this be determined for floats? Regards, Marc ________________________________________________________________________ Want to chat instantly with your online friends? Get the FREE Yahoo! Messenger http://mail.messenger.yahoo.co.uk

2 1

Python vs. Ruby
by Daniel Ehrenberg Nov. 1, 2003

Nov. 1, 2003

What are the advantages of Python over Ruby? They both look pretty good sytactically. Python seems slightly more readable, but that's probably just because I know Python. Ruby does have annoying end keywords, but in Python, you have to write "self." before every variable within a class, whereas in Ruby you just prefix it with "$". Ruby typically writes shorter code, and I think that's pretty important (it's partially why I chose Python). Daniel Ehrenberg __________________________________ Do you Yahoo!? Exclusive Video Premiere - Britney Spears http://launch.yahoo.com/promos/britneyspears/

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Re: [Tutor] More confusion on conversion
by Vicki Stanfield Nov. 1, 2003

Nov. 1, 2003

I'm about ready to go batty (wasn't intended as a Halloween pun, but I'll take it). I am so close with the following code: hexlength = '02X' % length print hexlength for each in hexlength: port.write(each) time.sleep(.01) but it generates an error: hexlength = '02X' % length TypeError: not all arguments converted I print the length, and it is 10. That is 2 characters, right? Or is it 3 with the terminator? If I set hexlength to '0A', it does what I want, but unfortunately, it is a variable. --vicki

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