Re: Ternary Operator in Python
Robert Kern wrote: Sunnan wrote: (((0.0 a) 1.0) b ) 2.0 Go on. Try it with a bunch of different values. My bad. (Of course. The subexpressions must return booleans, not the largest number. It couldn't work any other way.) Egg on my face, and all that (figuratively speaking). Not used to infix... -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
Roy Smith wrote: ... How our tools warp our thinking. That is what it means to be human. I can think of no better reason for a programmer to regularly learn languages: our tools warp our thinking. A programmer is a professionally warped thinker. --Scott David Daniels [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
Scott David Daniels wrote: Roy Smith wrote: ... How our tools warp our thinking. That is what it means to be human. I can think of no better reason for a programmer to regularly learn languages: our tools warp our thinking. A programmer is a professionally warped thinker. --Scott David Daniels [EMAIL PROTECTED] +1 QOTW STeVe -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
You could use condition and consequent or alternative I use it Sean On Apr 1, 2005 5:24 PM, praba kar [EMAIL PROTECTED] wrote: Dear All, I am new to Python. I want to know how to work with ternary operator in Python. I cannot find any ternary operator in Python. So Kindly clear my doubt regarding this __ Yahoo! Messenger Show us what our next emoticon should look like. Join the fun. http://www.advision.webevents.yahoo.com/emoticontest -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
praba kar wrote: Dear All, I am new to Python. I want to know how to work with ternary operator in Python. I cannot find any ternary operator in Python. http://www.python.org/peps/pep-0308.html -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
Sean Kemplay wrote: You could use condition and consequent or alternative I use it You should do so cautiously, since if consequent is false, it will not behave as suspected. Not to mention that it's quite unreadable. -- Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/ San Jose, CA, USA 37 20 N 121 53 W AIM erikmaxfrancis Physics, as we know it, will be over in six months. -- Max Born (1928) -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
On Apr 1, 2005 8:10 PM, Erik Max Francis [EMAIL PROTECTED] wrote: Sean Kemplay wrote: You could use condition and consequent or alternative I use it You should do so cautiously, since if consequent is false, it will not behave as suspected. Not to mention that it's quite unreadable. -- Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/ San Jose, CA, USA 37 20 N 121 53 W AIM erikmaxfrancis Physics, as we know it, will be over in six months. -- Max Born (1928) -- http://mail.python.org/mailman/listinfo/python-list I should have mentioned that, as I have been caught out before. Sean -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
praba kar [EMAIL PROTECTED] wrote: Dear All, I am new to Python. I want to know how to work with ternary operator in Python. I cannot find any ternary operator in Python. You answered your own question; there is no ternary operator in Python. There was a major debate on this newsgroup a year or so ago on this subject, and the decision was quite clear that no such feature would be added. If you google for python ternary, you will find a huge amount of material written on the subject. -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
praba kar [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Dear All, I am new to Python. I want to know how to work with ternary operator in Python. I cannot find any ternary operator in Python. So Kindly clear my doubt regarding this There isn't one, and there won't be one unless Guido changes his mind, and that's quite unlikely. There are a number of workarounds; the most used one seems to be based on a feature of the 'and' and 'or' operators. I believe Pep 308 has a summary of the different ways you can do it, and the advantages and drawbacks of each. John Roth __ Yahoo! Messenger Show us what our next emoticon should look like. Join the fun. http://www.advision.webevents.yahoo.com/emoticontest -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
praba kar wrote: Dear All, I am new to Python. I want to know how to work with ternary operator in Python. I cannot find any ternary operator in Python. So Kindly clear my doubt regarding this There is no ternary operator in python. There are several idioms that can be used to emulate one to a certain degree - but they are scolwed on by quite a few people. So better to not use them and just do it in a if: else: clause. -- Regards, Diez B. Roggisch -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
John Roth wrote: praba kar [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Dear All, I am new to Python. I want to know how to work with ternary operator in Python. I cannot find any ternary operator in Python. So Kindly clear my doubt regarding this There isn't one, and there won't be one unless Guido changes his mind, and that's quite unlikely. Au contraire, mon frere: There is a ternary operator in Python (fairly ill-documented) Its name is partial polynomial eval. As is traditional in implementing ternary operations in computer languages, the name of the operator does not show up anywhere in the code, so many people don't realize they are using it. Here is an example of the ppe used to evaluate a cubic, using the ternary operator three times in a single statement: def cubic(x, a, b, c, d): return ((a * x + b) * x + c) * x + d As you may be able to guess, the more common name is *+, and it is a nice self-documenting operator (it behaves just like the primitives). Originally the DEC Vax provided this as a vectorized opcode, which is where Python got the idea. You probably don't see it since you aren't doing much engineering work. --Scott David Daniels [EMAIL PROTECTED] -- No truth has been harmed by this April Fool's post. :-) -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
On Fri, 1 Apr 2005 08:24:42 +0100 (BST), praba kar [EMAIL PROTECTED] wrote: Dear All, I am new to Python. I want to know how to work with ternary operator in Python. I cannot find any ternary operator in Python. So Kindly clear my doubt regarding this __ Yahoo! Messenger Show us what our next emoticon should look like. Join the fun. http://www.advision.webevents.yahoo.com/emoticontest I've used boolean opperations to do it. result = (v == value) * first + (v != value) * second Same as: if v == value: result = first else: result = second Ron -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
praba kar [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Dear All, I am new to Python. I want to know how to work with ternary operator in Python. I cannot find any ternary operator in Python. So Kindly clear my doubt regarding this A unary operator has one operand; a binary operator has two operands; a ternary operator has three operands. Python has none built-in, although one can 'synthesize' all sorts of ternary operators by combining two binary operators, with the operand of one being the result of the other. However, people often don't think of such combinations as being such. Since C has one builtin ternary 'operator' (if-else), the term 'ternary operator' is too often used as a synonym for that particular example of a ternary operator. Others have referred you to discussions of if-else expressions in Python. Ironically, if one thinks of or defines an operator as being a function called without parenthesis, then C's ';:' and Python's 'and..or' are not really ternary operators but flow control expressions equivalent in effect to certain if/else statement pairs. That is because some of the operands may not be evaluated. That is also why there are no special methods corresponding to 'and' and 'or'. They are directly compiled to conditional code with no a function call corresponding to the 'operator'. Terry J. Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
Ron_Adam wrote: I've used boolean opperations to do it. result = (v == value) * first + (v != value) * second Same as: if v == value: result = first else: result = second No, it isn't, because it isn't short circuiting. If first or second had side effects, then the two would not be equivalent. -- Erik Max Francis [EMAIL PROTECTED] http://www.alcyone.com/max/ San Jose, CA, USA 37 20 N 121 53 W AIM erikmaxfrancis If the sun comes up / And you're not home / I'll be strong -- India Arie -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
Terry Reedy wrote: praba kar [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Dear All, I am new to Python. I want to know how to work with ternary operator in Python. I cannot find any ternary operator in Python. So Kindly clear my doubt regarding this A unary operator has one operand; a binary operator has two operands; a ternary operator has three operands. Python has none built-in, Not so fast, my friend. What about the expression 0.0 a 1.0? -- CARL BANKS -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
Carl Banks [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] A unary operator has one operand; a binary operator has two operands; ternary operator has three operands. Python has none built-in, Not so fast, my friend. What about the expression 0.0 a 1.0? Gee, what about 0.0 a 1.0 b 2.0? I see both as synthesized multinary operators, but your are right in that this combination does act differently than a+b+c. Terry J. Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
In article [EMAIL PROTECTED], Carl Banks [EMAIL PROTECTED] wrote: Terry Reedy wrote: praba kar [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Dear All, I am new to Python. I want to know how to work with ternary operator in Python. I cannot find any ternary operator in Python. So Kindly clear my doubt regarding this A unary operator has one operand; a binary operator has two operands; a ternary operator has three operands. Python has none built-in, Not so fast, my friend. What about the expression 0.0 a 1.0? I still remember one of the earliest bugs I ever wrote (I've long since forgotten most of the zillions I've written since). It must have been around 1975, and my high school had an ASR-33 connected to a HP-3000 running Time Shared Basic at another school a few towns away. I wrote something like 1 X 10 and got an error. I was puzzled by this, since we were using this notation in math class. The answer of course was that I needed to write 1 X AND X 10, which I found really annoying and strange looking. Or is my long-term memory returning corrupted data? Maybe BASIC let you do 1 X 10, but I ran into this when I moved onto FORTRAN the next year? In any case, I've gotten so used to writing 1 x x 10 (or variations on the theme) that now I've got a language which lets me write it the normal math way, 1 x 10, and *that* looks strange. Wierd, huh? How our tools warp our thinking. -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
Terry Reedy wrote: Carl Banks [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] A unary operator has one operand; a binary operator has two operands; ternary operator has three operands. Python has none built-in, Not so fast, my friend. What about the expression 0.0 a 1.0? Gee, what about 0.0 a 1.0 b 2.0? I see both as synthesized multinary operators, but your are right in that this combination does act differently than a+b+c. It seems that Python has an infinite number of operators. -- CARL BANKS -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
The good ol' DiveInto says: http://diveintopython.org/power_of_introspection/and_or.html#d0e9975 http://aspn.activestate.com/ASPN/Python/Cookbook/Recipe/52310 Diez B. Roggisch wrote: praba kar wrote: Dear All, I am new to Python. I want to know how to work with ternary operator in Python. I cannot find any ternary operator in Python. So Kindly clear my doubt regarding this There is no ternary operator in python. There are several idioms that can be used to emulate one to a certain degree - but they are scolwed on by quite a few people. So better to not use them and just do it in a if: else: clause. -- Regards, Diez B. Roggisch -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
Terry Reedy wrote: Gee, what about 0.0 a 1.0 b 2.0? I see both as synthesized multinary operators, but your are right in that this combination does act differently than a+b+c. Is really multinary in python? It looks binary to me, just like +. (a+b)+c (((0.0 a) 1.0) b ) 2.0 Sunnan -- http://mail.python.org/mailman/listinfo/python-list
Re: Ternary Operator in Python
Sunnan wrote: Terry Reedy wrote: Gee, what about 0.0 a 1.0 b 2.0? I see both as synthesized multinary operators, but your are right in that this combination does act differently than a+b+c. Is really multinary in python? It looks binary to me, just like +. (a+b)+c (((0.0 a) 1.0) b ) 2.0 Go on. Try it with a bunch of different values. -- Robert Kern [EMAIL PROTECTED] In the fields of hell where the grass grows high Are the graves of dreams allowed to die. -- Richard Harter -- http://mail.python.org/mailman/listinfo/python-list
