Conditional Expression

[Ene Uran]

I am fairly familiar with C, but new to Python. Does Python have something like the handy C conditional expression? For example:

// C conditional expression  x = a ? b : c;
// if a is true then x = b else x = c
// here used to print 10 numbers in each row
// the numbers are separated by tabs, each row ends with a '\n'

#include <stdio.h>

int main()
{
  int k;

  for(k = 0; k < 100; k++)
  {
    printf("%3d%c", k, (k % 10 == 9) ? '\n' : '\t');
  }
  
  getchar();  // make the console wait
  return 0;
}

[bumsfeld]

Python lambda can substitute, just harder to read:

tuple1 = ('\t', '\n')
for k in range(100):
    a = (k % 10 == 9)
    b = 1
    c = 0
    # similar to C conditional expression a ? b : c
    # if a is true return b else c
    f = lambda a, b, c: (a and [b] or [c])[0]
    print "%3d%s" % (k, tuple1[f(a, b, c)]),

[vegaseat]

Bumsfeld, this is an interesting application of the lambda function!

You can even make it simpler using tuple indexing directly ...

for k in range(100):
    # selects index 0 (False) or 1 (True) of tuple depending on == compare
    select_tab_or_newline = ('\t', '\n')[k % 10 == 9]
    print "%3d%s" % (k, select_tab_or_newline),

... or cut out the descriptive middleman ...

for k in range(100):
    print "%3d%s" % (k, ('\t', '\n')[k % 10 == 9]),

[ghostdog74]

I am fairly familiar with C, but new to Python. Does Python have something like the handy C conditional expression? For example:

// C conditional expression  x = a ? b : c;
// if a is true then x = b else x = c
// here used to print 10 numbers in each row
// the numbers are separated by tabs, each row ends with a '\n'

#include <stdio.h>

int main()
{
  int k;

  for(k = 0; k < 100; k++)
  {
    printf("%3d%c", k, (k % 10 == 9) ? '\n' : '\t');
  }
  
  getchar();  // make the console wait
  return 0;
}

in version 2.5, there will be implementations of conditional.
Look here

[Ene Uran]

Thank you all,
I will be trying all suggestions after I download version 2.5, to see which one I am most comfortable with.

Tuple indexing looks much like C, but then one should not copy C style into Python.