Very weird bug!

[ssecorp]

I was looking into currying and

Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
(Intel)] on win32
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IDLE 1.2.2

>>h = "aja baja"
>>h += 'e'
>>h

'aja bajae'

>>h = h+'a'
>>h

'aja bajaea'

>>a = b = "foo"
>>a

'foo'

>>b

'foo'

>>a==b

True

>>id(a)

35018400

>>id(b)

35018400

>>a += "bar"
>>id(a),a

(35110112, 'foobar')

>>id(b),b

(35018400, 'foo')

>>fac

Traceback (most recent call last):
File "<pyshell#1 4>", line 1, in <module>
fac
NameError: name 'fac' is not defined

>>factorial

Traceback (most recent call last):
File "<pyshell#1 5>", line 1, in <module>
factorial
NameError: name 'factorial' is not defined

>>import math
>>math

<module 'math' (built-in)>

>>math.factoria l

Traceback (most recent call last):
File "<pyshell#1 8>", line 1, in <module>
math.factorial
AttributeError: 'module' object has no attribute 'factorial'

>>math.fac

Traceback (most recent call last):
File "<pyshell#1 9>", line 1, in <module>
math.fac
AttributeError: 'module' object has no attribute 'fac'

>>dir(math)

['__doc__', '__name__', 'acos', 'asin', 'atan', 'atan2', 'ceil',
'cos', 'cosh', 'degrees', 'e', 'exp', 'fabs', 'floor', 'fmod',
'frexp', 'hypot', 'ldexp', 'log', 'log10', 'modf', 'pi', 'pow',
'radians', 'sin', 'sinh', 'sqrt', 'tan', 'tanh']

>>pow

<built-in function pow>

>>tan

Traceback (most recent call last):
File "<pyshell#2 2>", line 1, in <module>
tan
NameError: name 'tan' is not defined

>>math.tan

<built-in function tan>

>>def build(a,b):

return a+b

>>build(5,4)

(5, 4)

>>def build(x,y):

a=x+y
return a

>>build(5,4)

9

>>def b(n, p):

return n + p

>>b(1, 10)

11

>>def b(n,p):

return n+p

>>b(5,2)

7

>>def build(x,y):

return a+b

>>build(5,4)

Traceback (most recent call last):
File "<pyshell#4 4>", line 1, in <module>
build(5,4)
File "<pyshell#4 3>", line 2, in build
return a+b
TypeError: cannot concatenate 'str' and 'function' objects

>>def build(x,y):

yreturn x+

SyntaxError: invalid syntax

>>def build(x,y):

return x+y

>>build(5,4)

9

>>def build(a,b):

return a+b

>>build(5,4)

9

>>>

wtf was this in the middle!?

>>def build(a,b):

return a+b

>>build(5,4)

(5, 4)

[Terry Reedy]

Re: Very weird bug!

ssecorp wrote:

Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit
wtf was this in the middle!?
>

>>>def build(a,b):

return a+b
>

>>>build(5,4)

(5, 4)

I have exactly the same build on Windows and get the expected 9.

Try it again.

[ssecorp]

Re: Very weird bug!

i know, idid try it again and it works as expected. but how the h***
did it not work that one time?

[Jorgen Bodde]

Re: Very weird bug!

Maybe the interpreter remembered the values of some objects you used?
If you type in the interpreter, the objects you create have a lifetime
as long as the interpreter is active, which means it can get a state
behaviour that otherwise is not present if you start a new interpreter
instance. To be safe you should always try it with a script and run it
from the commandline to get the same 'state' everytime your script
runs.

- Jorgen


On Mon, Jul 7, 2008 at 7:36 PM, ssecorp <circularfunc@g mail.comwrote:

i know, idid try it again and it works as expected. but how the h***
did it not work that one time?
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