[Tutor] The magic parentheses
Hi,
This is my first post to the list, so tell me if I'm posting incorrectly.
I'm creating a script, http://python.codepad.org/mHyqbJ2z that gives the area
of two circles, based on their radius, and displays the difference between the
two results.
My problem is when the results are printed, I get this:
Python 2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit (Intel)] on
win32
IDLE 2.6.4 No Subprocess
>>>
('Variable 2,', 490.0, 'is greater than', 'Variable 2,', 8.0, '.')
>>>
('Variable 2,', 490.0, 'is greater than', 'Variable 2,', 8.0, '.')
>>>
..
The parentheses, as well as the apostrophes and commas. I'm sure it's the way
I'm having the results printed after it's through, but not sure how to correct
it.
I tried writing the 'Variable 1' and '2', as well as the 'is greater
than' within the y, and z local variables in the def return_difference_of12,
and got the same result as when I
listed the portions of the printed result's sentence in the non-local variables
I have now(I'm new to Python, so I'm not sure if this would be the correct
term).
Any help would be appreciated. Thanks in advance.
David
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Re: [Tutor] The magic parentheses
On 01/24/10 17:14, David Hutto wrote:
> Hi,
>
> This is my first post to the list, so tell me if I'm posting incorrectly.
>
> I'm creating a script, http://python.codepad.org/mHyqbJ2z that gives the area
> of two circles, based on their radius, and displays the difference between
> the two results.
>
> My problem is when the results are printed, I get this:
>
> Python 2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit (Intel)]
> on win32
> IDLE 2.6.4 No Subprocess
> ('Variable 2,', 490.0, 'is greater than', 'Variable 2,', 8.0, '.')
> ('Variable 2,', 490.0, 'is greater than', 'Variable 2,', 8.0, '.')
> ...
> The parentheses, as well as the apostrophes and commas. I'm sure it's the way
> I'm having the results printed after it's through, but not sure how to
> correct it.
>
> I tried writing the 'Variable 1' and '2', as well as the 'is greater
> than' within the y, and z local variables in the def return_difference_of12,
> and got the same result as when I
> listed the portions of the printed result's sentence in the non-local
> variables I have now(I'm new to Python, so I'm not sure if this would be the
> correct term).
>
> Any help would be appreciated. Thanks in advance.
>
OT: for short snippets like this, you should just paste it in the post
rather than using codepad
"""
y = v1,var1,v3,v2,var2,period
print y
"""
is not the same as
"""
print v1,var1,v3,v2,var2,period
"""
the first code creates a tuple, assign it to y, then prints the tuple;
the latter prints the bunch of items separated with space.
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Re: [Tutor] The magic parentheses
On Sun, Jan 24, 2010 at 7:14 AM, David Hutto wrote:
> Hi,
>
> This is my first post to the list, so tell me if I'm posting incorrectly.
>
> I'm creating a script, http://python.codepad.org/mHyqbJ2z that gives the
> area of two circles, based on their radius, and displays the difference
> between the two results.
>
> My problem is when the results are printed, I get this:
>
> Python 2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit
> (Intel)] on win32
> IDLE 2.6.4 No Subprocess
> >>>
> ('Variable 2,', 490.0, 'is greater than', 'Variable 2,', 8.0, '.')
> >>>
> ('Variable 2,', 490.0, 'is greater than', 'Variable 2,', 8.0, '.')
> >>>
> .
> The parentheses, as well as the apostrophes and commas. I'm sure it's the
> way I'm having the results printed after it's through, but not sure how to
> correct it.
>
> I tried writing the 'Variable 1' and '2', as well as the 'is greater than'
> within the y, and z local variables in the def return_difference_of12, and
> got the same result as when I listed the portions of the printed result's
> sentence in the non-local variables I have now(I'm new to Python, so I'm not
> sure if this would be the correct term).
>
> Any help would be appreciated. Thanks in advance.
>
>
> David
>
>
y = v1,var1,v3,v2,var2,period
print y
The first line assigns a tuple to y. The parentheses and commas is the way
tuples are printed. To avoid those, you could either pass all the arguments
directly to print, or use some string formatting instead of constructing a
tuple:
>>> a = 'this', 'is', 'a tuple'
>>> a
('this', 'is' , 'a tuple')
>>> print a
(1, 2, 3)
>>> print 'this', 'is passed', 'to print directly'
1 2 3
>>> print "this is {0}".format("formatted")
this is formatted
Hugo
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Re: [Tutor] The magic parentheses
"David Hutto" wrote
This is my first post to the list, so tell me if I'm posting incorrectly.
You are doing fine. Welcome.
My problem is when the results are printed, I get this:
>>>
('Variable 2,', 490.0, 'is greater than', 'Variable 2,', 8.0, '.')
The parentheses, as well as the apostrophes and commas.
I'm sure it's the way I'm having the results printed after it's
through, but not sure how to correct it.
You have two problems in your code(at least!)
---def area2(radius):
area2r = 3.14159 * mainvar2**2
return area2r
print area2r
The print statement will never be called because the return
statement forces an exit from the function.
-
def return_difference_of12(var1,var2):
if var1 - var2 > 0:
y = v1,var1,v3,v2,var2,period
print y
elif var2 - var1 > 0:
z = v2,var2,v3,v2,var1,period
print z
The assignments to y and z create tuples
(a,b,c...)So you are asking to print a tuple and Python represents tuples
by putting parens around the contents.To print them as a string use the
join() method of a string using an empty string:print ''.join([str(s) for s
in y])However this is an unusual way to print this type of output,It would
be more normal to use a format string:print "Variable2: %f id greater than
Variable1: %f." % (var1,var2)This reduces the number of variables needed
and also gives you much more control over layout because the %f markers can
be augmented with width specifiers, justificationhints etc.You can store
the entire format string in a variable if you wish - especiaslly if you
want to use it multiple times - but in your case the strings only appear
once so I wouldn't bother.HTH,-- Alan GauldAuthor of the Learn to Program
web sitehttp://www.alan-g.me.uk/
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