Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>The scope of functions <code>hello</code> and <code>hi</code> are entirely different. They do not have any variables in common.</p> <p>Note that the result of calling <code>hi(x,y)</code> is some object. You save that object with the name <code>good</code> in the function <code>hello</code>.</p> <p>The variable named <code>good</code> in <code>hello</code> is a different variable, unrelated to the variable named <code>good</code> in the function <code>hi</code>.</p> <p>They're spelled the same, but the exist in different namespaces. To prove this, change the spelling the <code>good</code> variable in one of the two functions, you'll see that things still work.</p> <hr> <p>Edit. Follow-up: "so what should i do if i want use the result of <code>hi</code> function in <code>hello</code> function?"</p> <p>Nothing unusual. Look at <code>hello</code> closely.</p> <pre><code>def hello(x,y): fordf150 = hi(y,x) "then do somethings,and use the variable 'fordf150'." return something def hi( ix, iy ): "compute some value, good." return good </code></pre> <p>Some script evaluates <code>hello( 2, 3)</code>.</p> <ol> <li><p>Python creates a new namespace for the evaluation of <code>hello</code>.</p></li> <li><p>In <code>hello</code>, <code>x</code> is bound to the object <code>2</code>. Binding is done position order.</p></li> <li><p>In <code>hello</code>, <code>y</code> is bound to the object <code>3</code>.</p></li> <li><p>In <code>hello</code>, Python evaluates the first statement, <code>fordf150 = hi( y, x )</code>, <code>y</code> is 3, <code>x</code> is 2.</p> <p>a. Python creates a new namespace for the evaluation of <code>hi</code>.</p> <p>b. In <code>hi</code>, <code>ix</code> is bound to the object <code>3</code>. Binding is done position order.</p> <p>c. In <code>hi</code>, <code>iy</code> is bound to the object <code>2</code>.</p> <p>d. In <code>hi</code>, something happens and <code>good</code> is bound to some object, say <code>3.1415926</code>.</p> <p>e. In <code>hi</code>, a <code>return</code> is executed; identifying an object as the value for <code>hi</code>. In this case, the object is named by <code>good</code> and is the object <code>3.1415926</code>.</p> <p>f. The <code>hi</code> namespace is discarded. <code>good</code>, <code>ix</code> and <code>iy</code> vanish. The object (<code>3.1415926</code>), however, remains as the value of evaluating <code>hi</code>.</p></li> <li><p>In <code>hello</code>, Python finishes the first statement, <code>fordf150 = hi( y, x )</code>, <code>y</code> is 3, <code>x</code> is 2. The value of <code>hi</code> is <code>3.1415926</code>.</p> <p>a. <code>fordf150</code> is bound to the object created by evaluating <code>hi</code>, <code>3.1415926</code>.</p></li> <li><p>In <code>hello</code>, Python moves on to other statements.</p></li> <li><p>At some point <code>something</code> is bound to an object, say, <code>2.718281828459045</code>.</p></li> <li><p>In <code>hello</code>, a <code>return</code> is executed; identifying an object as the value for <code>hello</code>. In this case, the object is named by <code>something</code> and is the object <code>2.718281828459045</code>.</p></li> <li><p>The namespace is discarded. <code>fordf150</code> and <code>something</code> vanish, as do <code>x</code> and <code>y</code>. The object (<code>2.718281828459045</code>), however, remains as the value of evaluating <code>hello</code>.</p></li> </ol> <p>Whatever program or script called <code>hello</code> gets the answer.</p>
    singulars
    1. This table or related slice is empty.
    1. POA small question about python's variable scope
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USS.Lott
    1. USS.Lott
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POA small question about python's variable scope
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COis that means the two functions are totally have relations?so what should i do if i want use the result of hi function in hello function? thanks alot
      singulars
      1. PO
      1. USNONEenglisher
    2. COThere's a term for the situation where 'hello' calls 'hi' and 'hi' calls 'hello'. We call it recursion. A simpler case is when a function can call itself. It's not usually considered a beginner's topic, but if you run a search on recursion you'll find plenty of information. Welcome to programming.
      singulars
      1. PO
      1. USJeffrey Martinez
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload