put multiple condition in if statement

[Jim Segrave]

In article <qhp412tba18h050i1m7974n83lih4hefa3 at 4ax.com>,
Dennis Lee Bieber  <wlfraed at ix.netcom.com> wrote:
>On 10 Mar 2006 21:12:57 -0800, Allerdyce.John at gmail.com declaimed the
>following in comp.lang.python:
>
>> How can I put multiple condition in if statement?
>>
>	Lesson one: Python is NOT C
> 
>> I try this, but I can't get that to work.
>> 
>> if ( (str != " ") && (str != "") ):
>
>	Lesson two: an empty (aka, null) string is "false", and a non-empty
>string is "true", so that gives us
>
>	Lesson three: " " is not equal to "  " or "            " so you
>might want to do strip whitespace first...
>
>>>> "" == " "
>False
>>>> " " == "  "
>False
>>>> "".strip() == "  ".strip()
>True
>>>> 
>
>	So... Your mixed C/Python simplifies to just...
>
>	if str.strip():		# after removing leading/trailing spaces, 
>					# if not empty, do something

str = "     "
and
str = "\t" 
fail with your substitution - the OP was looking only for strings
containing one space or empty strings. Tab characters and multi-spaces
would not match. 

-- 
Jim Segrave           (jes at jes-2.demon.nl)