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Date: Sun, 13 Oct 2013 13:49:53 +0530
Subject: Doubt on generators behavior
From: Krishnan Shankar <i.am.songoku@gmail.com>
To: Python <python-list@python.org>
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Hi Friends,

I am new to Generators and was learning the same by experimenting. I wrote
a small code which is as below.

>>> def test_gen(var):
...     print "The number is", var
...     if var % 2 == 0:
...         yield var
...     else:
...         print "Number is odd"
...
>>>

But when i was executing i saw a behavior i could not understand. When i
gave an even number,
1. The generator object was created
2. When i gave next the argument was yielded.
3. In the subsequent next the Stop Iteration was raised.

>>> res = test_gen(78)
>>> res.next()
The number is 78
78
>>> res.next()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration

But When i ran with an odd number the result of "Number is odd" is printed.
But it seems the generator runs again by itself to Stop Iteration.

>>> res2 = test_gen(77)
>>> res2.next()
The number is 77
Number is odd
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration
>>>

How did this happen automatically? I am not able to get the execution of a
generator. Can someone please help me in understanding?
Regards,
Krishnan

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<div dir=3D"ltr">Hi Friends,<div><br></div><div style>I am new to Generator=
s and was learning the same by experimenting. I wrote a small code which is=
 as below.</div><div style><br></div><div style><div>&gt;&gt;&gt; def test_=
gen(var):</div>
<div>... =A0 =A0 print &quot;The number is&quot;, var</div><div>... =A0 =A0=
 if var % 2 =3D=3D 0:</div><div>... =A0 =A0 =A0 =A0 yield var</div><div>...=
 =A0 =A0 else:</div><div>... =A0 =A0 =A0 =A0 print &quot;Number is odd&quot=
;</div><div>...=A0</div><div>&gt;&gt;&gt;=A0</div>
<div><br></div><div style>But when i was executing i saw a behavior i could=
 not understand. When i gave an even number,</div><div style>1. The generat=
or object was created</div><div style>2. When i gave next the argument was =
yielded.=A0</div>
<div style>3. In the subsequent next the Stop Iteration was raised.</div><d=
iv style><br></div><div>&gt;&gt;&gt; res =3D test_gen(78)</div><div>&gt;&gt=
;&gt; res.next()</div><div>The number is 78</div><div>78</div><div>&gt;&gt;=
&gt; res.next()</div>
<div>Traceback (most recent call last):</div><div>=A0 File &quot;&lt;stdin&=
gt;&quot;, line 1, in &lt;module&gt;</div><div>StopIteration</div><div><br>=
</div><div style>But When i ran with an odd number the result of &quot;Numb=
er is odd&quot; is printed. But it seems the generator runs again by itself=
 to Stop Iteration.=A0</div>
<div style><br></div><div>&gt;&gt;&gt; res2 =3D test_gen(77)</div><div>&gt;=
&gt;&gt; res2.next()</div><div>The number is 77</div><div>Number is odd</di=
v><div>Traceback (most recent call last):</div><div>=A0 File &quot;&lt;stdi=
n&gt;&quot;, line 1, in &lt;module&gt;</div>
<div>StopIteration</div><div>&gt;&gt;&gt;=A0</div><div><br></div><div style=
>How did this happen automatically? I am not able to get the execution of a=
 generator. Can someone please help me in understanding?</div><div style>
Regards,</div><div style>Krishnan</div></div></div>

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