Multiplication error in python

[sakthi]

In the following code,

l=[1,2,3,4,5]
i=0
for a in l:

.... p=2*a
.... t=p+i
.... i=t
....45

Python gives an answer as 45. But i am getting 30 when i execute
manually. Is there any different multiplication pattern in python?
Thank yu.

 

[Gary Herron]

In the following code,

l=[1,2,3,4,5]
i=0
for a in l:

... p=2*a
... t=p+i
... i=t
...45

Python gives an answer as 45. But i am getting 30 when i execute
manually. Is there any different multiplication pattern in python?
Thank yu.

I think it's most likely you've made an error here. Running your exact
lines in Python gives the expected result:

l=[1,2,3,4,5]
i=0
for a in l:

... p=2*a
... t=p+i
... i=t
...30

Please try again. If you can reproduce the incorrect result -- then we
have a real bug. However, the chance of that is really really tiny.

Gary Herron

 

[becky_lewis]

I tried running your code in ipython:

In [1]: l = [1,2,3,4,5]
In [2]: i = 0
In [3]: for a in l:
...: p = 2 * a
...: t = p + i
...: i = t
...:
In [4]:
In [4]: t
Out[4]: 30

The output from Python was 30, not 45. What Python version are you
running?

In the following code,>>> l=[1,2,3,4,5]
...     p=2*a
...     t=p+i
...     i=t
...>>> t

45

Python gives an answer as 45. But i am getting 30 when i execute
manually. Is there any different multiplication pattern in python?
Thank yu.

 

[Chris Rebert]

In the following code,

l=[1,2,3,4,5]
i=0
for a in l:

...     p=2*a
...     t=p+i
...     i=t
...45

Python gives an answer as 45. But i am getting 30 when i execute
manually. Is there any different multiplication pattern in python?
Thank yu.

My Python gives 30; methinks perhaps you've elided some important part
of your code.
Also, I note that your loop body can be significantly simplified to
just: i += 2*a

Cheers,
Chris

 

[sakthi]

In the following code,

l=[1,2,3,4,5]
i=0
for a in l:

...     p=2*a
...     t=p+i
...     i=t
...

t 45

Python gives an answer as 45. But i am getting 30 when i execute
manually. Is there any different multiplication pattern in python?
Thank yu.

My Python gives 30; methinks perhaps you've elided some important part
of your code.
Also, I note that your loop body can be significantly simplified to
just: i += 2*a

Cheers,
Chris
--http://rebertia.com

if i put i += 2*a it returns 155.

 

[becky_lewis]

I think you may be doing something wrong.

If I run:

l = [1, 2, 3, 4, 5]
i = 0
for a in l:

... i += 2 * a
...30

The result is 30 as expected.

Nowhere near the 155 that you are getting. :/

Again, could you state which version of python are you using (and what
OS) so that we can run the code in the same environment as you.

Becky Lewis

 

[Tim Daneliuk]

In the following code,
l=[1,2,3,4,5]
i=0
for a in l:
... p=2*a
... t=p+i
... i=t
...
t
45

Python gives an answer as 45. But i am getting 30 when i execute
manually. Is there any different multiplication pattern in python?
Thank yu.

My Python gives 30; methinks perhaps you've elided some important part
of your code.
Also, I note that your loop body can be significantly simplified to
just: i += 2*a

Cheers,
Chris
--http://rebertia.com

if i put i += 2*a it returns 155.

Are you sure you don't have something indented incorrectly?

How about a plain text copy of your program (without the interactive
stuff) so we can run it independently...

 

[Chris Angelico]

My guess is that you actually typed
   p=3*a
instead of
   p=2*a

That produces 45.

Or alternatively, that you used an interactive Python environment and
didn't clear i between runs.

ChrisA