How to do "new_variable = (variable) ? True : False;" (php) on python?

[Daniel Crespo]

Hello to all,

How can I do

new_variable = (variable) ? True : False;

in Python in one line?

I want to do something like this:

dic = {'item1': (variable) ? True-part : False-part}

Any suggestions?

Daniel

[Peter Otten]

Daniel Crespo wrote:

How can I do

new_variable = (variable) ? True : False;

in Python in one line?

new_variable = variable

:-)

Peter

[Peter Otten]

Daniel Crespo wrote:

How can I do

new_variable = (variable) ? True : False;

in Python in one line?

new_variable = variable

:-)

Peter

[Sam Pointon]

Daniel Crespo wrote:

Hello to all,

How can I do

new_variable = (variable) ? True : False;

in Python in one line?

I want to do something like this:

dic = {'item1': (variable) ? True-part : False-part}

Any suggestions?

Daniel

There's a trick using the short-circuiting boolean logic operators to
emulate the ternary operator in Python. Basically, you do
TEST and TRUE_PART or FALSE_PART

However, this fails if TRUE_PART evaluates to a False value; you end up
with FALSE_PART's value instead.

This is a trick/hack, though, and shouldn't really be used much - use
an if statement instead, or wait til 2.5 when an if expression is
coming in.

[Sam Pointon]

Daniel Crespo wrote:

Hello to all,

How can I do

new_variable = (variable) ? True : False;

in Python in one line?

I want to do something like this:

dic = {'item1': (variable) ? True-part : False-part}

Any suggestions?

Daniel

There's a trick using the short-circuiting boolean logic operators to
emulate the ternary operator in Python. Basically, you do
TEST and TRUE_PART or FALSE_PART

However, this fails if TRUE_PART evaluates to a False value; you end up
with FALSE_PART's value instead.

This is a trick/hack, though, and shouldn't really be used much - use
an if statement instead, or wait til 2.5 when an if expression is
coming in.

[Scott David Daniels]

Peter Otten wrote:

Daniel Crespo wrote:

new_variable = (variable) ? True : False;
in Python in one line?

new_variable = variable

Of course to answer your actual question:

new_variable = variable and True or False

But you should consider that Peter has given
you a better answer than you think.

<yoda>
Don't try to force everything to the type you expect,
use things as they are; embrace duck-typing.
</yoda>
:-)

--Scott David Daniels
sc***********@acm.org

[Scott David Daniels]

Peter Otten wrote:

Daniel Crespo wrote:

new_variable = (variable) ? True : False;
in Python in one line?

new_variable = variable

Of course to answer your actual question:

new_variable = variable and True or False

But you should consider that Peter has given
you a better answer than you think.

<yoda>
Don't try to force everything to the type you expect,
use things as they are; embrace duck-typing.
</yoda>
:-)

--Scott David Daniels
sc***********@acm.org

[Dave Hansen]

On Fri, 18 Nov 2005 14:15:06 -0800 in comp.lang.python, Scott David
Daniels <sc***********@acm.org> wrote:

<yoda>
Don't try to force everything to the type you expect,
use things as they are; embrace duck-typing.
</yoda>
Wrong, the grammar you have.
Do not Everything to the type you expect force.
Do or do not, there is no try.
Things as they are use.
Duck-typing embrace.
:-)

Ditto. Regards,
-=Dave

--
Change is inevitable, progress is not.

[Dave Hansen]

On Fri, 18 Nov 2005 14:15:06 -0800 in comp.lang.python, Scott David
Daniels <sc***********@acm.org> wrote:

<yoda>
Don't try to force everything to the type you expect,
use things as they are; embrace duck-typing.
</yoda>
Wrong, the grammar you have.
Do not Everything to the type you expect force.
Do or do not, there is no try.
Things as they are use.
Duck-typing embrace.
:-)

Ditto. Regards,
-=Dave

--
Change is inevitable, progress is not.

[bonono]

Peter Otten wrote:

Daniel Crespo wrote:

How can I do

new_variable = (variable) ? True : False;

in Python in one line?

new_variable = variable

:-)

I would assume the OP is just lazy and don't want to type :

new_variable = (variable_is_true_value) ?
some_expression_when_variable_is_true_value is true :
some_expression_when_variable_is_true_value is false

rather than simple True/False.

[bonono]

Peter Otten wrote:

Daniel Crespo wrote:

How can I do

new_variable = (variable) ? True : False;

in Python in one line?

new_variable = variable

:-)

I would assume the OP is just lazy and don't want to type :

new_variable = (variable_is_true_value) ?
some_expression_when_variable_is_true_value is true :
some_expression_when_variable_is_true_value is false

rather than simple True/False.