Determine if variable is defined in Python -

-

संभव डुप्लिकेट:

आप कैसे जानते हैं कि एक चर एक रनटाइम पर कोड में किसी विशेष स्थान पर सेट किया गया है? यह हमेशा स्पष्ट नहीं होता है क्योंकि (1) वैरिएबल को सशर्त सेट किया जा सकता है, और (2) वेरिएबल को सशर्त रूप से हटाया जा सकता है। मैं PHP या परिभाषित? रूबी में परिभाषित () जैसे कुछ के लिए देख रहा / रही हूं / isset () में Pre> यदि कंडीशन: a = 42 # है "a" यहां परिभाषित है? यदि अन्य कंडिशन: डेल ए # है तो "ए" यहां परिभाषित है? 

  प्रयास करें: nameError को छोड़कर thevariable: प्रिंट "ठीक है, यह नहीं था सभी के बाद परिभाषित! " Else: प्रिंट "निश्चित है, यह परिभाषित किया गया था।"

Comments

Post a Comment

Popular posts from this blog

MySql variables and php -

-
I am getting an error with php in order to format mysql_query () in php to format this string What is the right way? SELECT SELECT SELECT (*) Agents @AgentCount; User_Agent_English, User_Angent_Oursal, US.___Gent_Aginal, COUNT (User_Agent_Percade) ACC, COUNT (*) / (AgentCount) Percentage by agents user_agent_preser order DEC limit limit 50; In PHP, how am i setting $ query $ query = "SELECT count (*) agents @ agentcount; SELECT user_agent_parsed, User_agent_original , COUNT (user_agent_parsed) ascount, COUNT (*) / (@AgentCount) as a percentage by user_agent_parced by URI date DESC limit 50 "; This exact query will work properly if I put it in MySQL directly through a command line session. Do I need to release two separate php calls from mysql_query () and store the results first? I get the following error: There is an error in your SQL syntax; Instead of using a sub-selection and instead of using the 'SELECT user_agent_parsed, user_agent_original, ne...
Read more

ios - Form Sheet content disappearing -

-
Image
I am trying to apply a form sheet. Looks like this on the storyboard: App background only when I run Appears and everything else is hidden. I am presenting a form sheet using model sheets - I am working with the form sheet and I (WREGLR Regular) size. Why is this happening?
Read more

php - Laravel - Overriding a resource route into a different route filter group -

-
Does Laravel's routing work as expected? What I think, if I want to override a route, then I just have to give the expected route before each other. I have something like this: root :: group (array ('first' = & gt; 'defaultLoads' =); function () {root :: post 'Newsletter', 'newsletter controller @ store'); root: group (array ('(newsletter', 'newsletter controller');}}); That if I post this route, only http://domain.com/newsletter should run only the default loads route filter. However, when I call php Runs artisan routes , I get this: | | POST newsletter | newsletter.store | newslettercontroller@ store | default loads | login | | though it reads the route correctly (PHP artisan loads which The correct path is to the right place) but the file of the resource path even if it is not in the filter group, the path is affected. Then my question: How does it work Laravel? If so, do I post this -> Newsle...
Read more