Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <ol> <li><p><code>exec</code> is not an expression: a statement in Python 2.x, and a function in Python 3.x. It compiles and immediately evaluates a statement or set of statement contained in a string. Example:</p> <pre><code>exec('print(5)') # prints 5. # exec 'print 5' if you use Python 2.x, nor the exec neither the print is a function there exec('print(5)\nprint(6)') # prints 5{newline}6. exec('if True: print(6)') # prints 6. exec('5') # does nothing and returns nothing. </code></pre></li> <li><p><code>eval</code> is a built-in function (<strong>not</strong> a statement), which evaluates an expression and returns the value that expression produces. Example:</p> <pre><code>x = eval('5') # x &lt;- 5 x = eval('%d + 6' % x) # x &lt;- 11 x = eval('abs(%d)' % -100) # x &lt;- 100 x = eval('x = 5') # INVALID; assignment is not an expression. x = eval('if 1: x = 4') # INVALID; if is a statement, not an expression. </code></pre></li> <li><p><code>compile</code> is a lower level version of <code>exec</code> and <code>eval</code>. It does not execute or evaluate your statements or expressions, but returns a code object that can do it. The modes are as follows:</p> <ol> <li><code>compile(string, '', 'eval')</code> returns the code object that would have been executed had you done <code>eval(string)</code>. Note that you <em>cannot</em> use statements in this mode; only a (single) expression is valid.</li> <li><code>compile(string, '', 'exec')</code> returns the code object that would have been executed had you done <code>exec(string)</code>. You can use any number of statements here.</li> <li><code>compile(string, '', 'single')</code> is like the <code>exec</code> mode, but it will ignore everything except for the first statement. Note that an <code>if</code>/<code>else</code> statement with its results is considered a single statement.</li> </ol></li> </ol>
    singulars
    1. This table or related slice is empty.
    1. POWhat's the difference between eval, exec, and compile in Python?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USArpad Horvath
    1. USMax Shawabkeh
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    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. COIn Python 3, `exec()` now is in fact a function.
      singulars
      1. PO
      1. USTim Pietzcker
    2. COSince (as you point out), `exec` is a statement in the version you were targeting, it's deceptive to include those parens, and if you try to use the `in globals, locals`, also buggy.
      singulars
      1. PO
      1. USMike Graham
 

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