Re: How to get the minimum number that can be represented?
On Sun, Sep 20, 2009 at 12:46 AM, Daniel Fetchinson fetchin...@googlemail.com wrote: Suppose I want to define a function that return the minimum number that can be represented. def f(x): #body That it, if I call f(10), f will return the minimum integer that can be represented in the machine; if I cal f(10.5), f will return the minimum float that can be represented in the machine. Could somebody let me know what should be in the function body? I'm not sure this is what you are looking for but have a look at import sys print sys.maxint The problem is how to know what type of the argument and call the corresponding function. In C++, it is relatively easy (limits header). Is there an equivalent in python? Regards, Peng -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get the minimum number that can be represented?
On Sep 20, 1:15 pm, Peng Yu pengyu...@gmail.com wrote: The problem is how to know what type of the argument and call the corresponding function. type(1) type 'int' type(1.2) type 'float' -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get the minimum number that can be represented?
On 2009-09-20, Peng Yu pengyu...@gmail.com wrote: Suppose I want to define a function that return the minimum number that can be represented. def f(x): #body That it, if I call f(10), f will return the minimum integer that can be represented in the machine; if I cal f(10.5), f will return the minimum float that can be represented in the machine. Could somebody let me know what should be in the function body? The stuff you wan is in the sys module. For example: sys.float_info sys.floatinfo(max=1.7976931348623157e+308, max_exp=1024, max_10_exp=308, min=2.2250738585072014e-308, min_exp=-1021, min_10_exp=-307, dig=15, mant_dig=53, epsilon=2.2204460492503131e-16, radix=2, rounds=1) sys.maxint 2147483647 You might also want to read up on the type() builtin -- Grant -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get the minimum number that can be represented?
On Sun, Sep 20, 2009 at 9:37 AM, Grant Edwards inva...@invalid.invalid wrote: On 2009-09-20, Peng Yu pengyu...@gmail.com wrote: Suppose I want to define a function that return the minimum number that can be represented. def f(x): #body That it, if I call f(10), f will return the minimum integer that can be represented in the machine; if I cal f(10.5), f will return the minimum float that can be represented in the machine. Could somebody let me know what should be in the function body? The stuff you wan is in the sys module. For example: sys.float_info sys.floatinfo(max=1.7976931348623157e+308, max_exp=1024, max_10_exp=308, min=2.2250738585072014e-308, min_exp=-1021, min_10_exp=-307, dig=15, mant_dig=53, epsilon=2.2204460492503131e-16, radix=2, rounds=1) sys.maxint 2147483647 You might also want to read up on the type() builtin I want avoid using any 'if' statement. In C++, I can use template. How to do not use 'if' statement in python? Regards, Peng -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get the minimum number that can be represented?
On 2009-09-20, Peng Yu pengyu...@gmail.com wrote: You might also want to read up on the type() builtin I want avoid using any 'if' statement. Why? In C++, I can use template. If you want to write C++ code, then you should use a C++ compiler. How to do not use 'if' statement in python? In python you use the 'if' statement. -- Grant Edwards grante Yow! I am covered with at pure vegetable oil and I am visi.comwriting a best seller! -- http://mail.python.org/mailman/listinfo/python-list
Re: Re: How to get the minimum number that can be represented?
Peng Yu wrote: On Sun, Sep 20, 2009 at 9:37 AM, Grant Edwards inva...@invalid.invalid wrote: On 2009-09-20, Peng Yu pengyu...@gmail.com wrote: Suppose I want to define a function that return the minimum number that can be represented. def f(x): #body That it, if I call f(10), f will return the minimum integer that can be represented in the machine; if I cal f(10.5), f will return the minimum float that can be represented in the machine. Could somebody let me know what should be in the function body? The stuff you wan is in the sys module. For example: sys.float_info sys.floatinfo(max=7976931348623157e+308, max_exp24, max_10_exp08, min=2.2250738585072014e-308, min_exp=-1021, min_10_exp=07, dig, mant_digS, epsilon=2.2204460492503131e-16, radix=2, rounds=1) sys.maxint 2147483647 You might also want to read up on the type() builtin I want avoid using any 'if' statement. In C++, I can use template. How to do not use 'if' statement in python? Regards, Peng So if the homework assignment is for C++, do it in C++. If this is supposed to be some kind of programming challenge, then you need to state all the rules up front. For example, you could write something like def f(x): return [-10, 42][2*x - 20] and it'll return -10 for value 10 and 42 for value 10.5 Or: def f(x): result = raw_input(What's the smallest value of the same type as + str(x)) return result And of course if the constraint is not to use the if statement, and you can use Python 2.6, how about a conditional expression? -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get the minimum number that can be represented?
On Sep 20, 11:23 am, Peng Yu pengyu...@gmail.com wrote:
On Sun, Sep 20, 2009 at 9:37 AM, Grant Edwards inva...@invalid.invalid
wrote:
On 2009-09-20, Peng Yu pengyu...@gmail.com wrote:
Suppose I want to define a function that return the minimum number
that can be represented.
def f(x):
#body
That it, if I call f(10), f will return the minimum integer that can
be represented in the machine; if I cal f(10.5), f will return the
minimum float that can be represented in the machine.
Could somebody let me know what should be in the function body?
The stuff you wan is in the sys module.
For example:
sys.float_info
sys.floatinfo(max=1.7976931348623157e+308, max_exp=1024,
max_10_exp=308, min=2.2250738585072014e-308, min_exp=-1021,
min_10_exp=-307, dig=15, mant_dig=53, epsilon=2.2204460492503131e-16,
radix=2, rounds=1)
sys.maxint
2147483647
You might also want to read up on the type() builtin
I want avoid using any 'if' statement. In C++, I can use template. How
to do not use 'if' statement in python?
Regards,
Peng
Python polymorphism is done differently than C++ templates.
Normally you would write your code to be as type agnostic as you
reasonable could. In this case you actually desire to do different
things based on the type of the argument. Either use an if statement
or you can dispatch on the type using a dict:
mins = {
float: 2.2250738585072014e-308,
int: 0,
long: 0,
}
def f(arg):
return mins[type(arg)]
(Hint: google for duck typing.)
HTH,
~Simon
--
http://mail.python.org/mailman/listinfo/python-list
How to get the minimum number that can be represented?
Hi, Suppose I want to define a function that return the minimum number that can be represented. def f(x): #body That it, if I call f(10), f will return the minimum integer that can be represented in the machine; if I cal f(10.5), f will return the minimum float that can be represented in the machine. Could somebody let me know what should be in the function body? Regards, Peng -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get the minimum number that can be represented?
Suppose I want to define a function that return the minimum number that can be represented. def f(x): #body That it, if I call f(10), f will return the minimum integer that can be represented in the machine; if I cal f(10.5), f will return the minimum float that can be represented in the machine. Could somebody let me know what should be in the function body? I'm not sure this is what you are looking for but have a look at import sys print sys.maxint HTH, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
