[Tutor] append value to dictionary key
I would like to append a value to a dictionary key where there is already a
value. Something like the below:
d = {'name': {'2': 0.0, '7': 10.0, '8': 0.0, '9': 0.0}}
append 10 to d['name']['2']
d = {'name': {'2': 0.0,10, '7': 10.0, '8': 0.0, '9': 0.0}}
When I try to this I get the following error:
>>> d['name']['2'].append(10)
Traceback (most recent call last):
File "", line 1, in
AttributeError: 'float' object has no attribute 'append'
I am obviously doing this wrong. How would I accomplish this?
Thank you in advance.
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Re: [Tutor] append value to dictionary key
On 06/03/15 14:28, Chris Stinemetz wrote:
I would like to append a value to a dictionary key where there is already a
value. Something like the below:
d = {'name': {'2': 0.0, '7': 10.0, '8': 0.0, '9': 0.0}}
append 10 to d['name']['2']
d = {'name': {'2': 0.0,10, '7': 10.0, '8': 0.0, '9': 0.0}}
When I try to this I get the following error:
d['name']['2'].append(10)
Traceback (most recent call last):
File "", line 1, in
AttributeError: 'float' object has no attribute 'append'
To append a value you need a list.
So put the values of the dictionary in lists.
d = {'name': {'2': [0.0], '7': [10.0], '8': [0.0], '9': [0.0]}}
Now your
d['name']['2'].append(10)
will work and produce:.
d = {'name': {'2': [0.0, 10], '7': [10.0], '8': [0.0], '9': [0.0]}}
--
Alan G
Author of the Learn to Program web site
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Re: [Tutor] append value to dictionary key
Op 06-03-15 om 15:28 schreef Chris Stinemetz:
I would like to append a value to a dictionary key where there is already a
value. Something like the below:
d = {'name': {'2': 0.0, '7': 10.0, '8': 0.0, '9': 0.0}}
append 10 to d['name']['2']
d = {'name': {'2': 0.0,10, '7': 10.0, '8': 0.0, '9': 0.0}}
When I try to this I get the following error:
d['name']['2'].append(10)
Traceback (most recent call last):
File "", line 1, in
AttributeError: 'float' object has no attribute 'append'
Maybe it's easier to break down your problem and start with a smaller
example. Remove the dictionary and do the following:
>>> x = 0.0
>>> x.append(10)
What do you expect to happen?
Here's the output:
Traceback (most recent call last):
File "", line 1, in
AttributeError: 'float' object has no attribute 'append'
Exactly the same as yours!
So, a float has no 'append' attribute, but what objects do have that?
Sounds like you need a list to hold an arbitrary number of items.
>>> l = [0.0]
>>> l
[0.0]
>>> l.append(10)
>>> l
[0.0, 10]
Timo
I am obviously doing this wrong. How would I accomplish this?
Thank you in advance.
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[Tutor] Idle - ImportError: No module named numpy
Hi, I'm beginning to study the numpy. When I open a terminal (Debian Squeeze) and run the python interpreter the command "import numpy as np" run without errors. But when I run the same command on idle3 the following error appears. >>> import numpy as np Traceback (most recent call last): File "", line 1, in import numpy as np ImportError: No module named numpy How configure idle to load the numpy module? Thanks, Markos ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Idle - ImportError: No module named numpy
Well on the python interpretor did you use python3 or just python? On 03/06/2015 01:27 PM, Markos wrote: Hi, I'm beginning to study the numpy. When I open a terminal (Debian Squeeze) and run the python interpreter the command "import numpy as np" run without errors. But when I run the same command on idle3 the following error appears. >>> import numpy as np Traceback (most recent call last): File "", line 1, in import numpy as np ImportError: No module named numpy How configure idle to load the numpy module? Thanks, Markos ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Idle - ImportError: No module named numpy
On Fri, Mar 6, 2015 at 12:27 PM, Markos wrote: > Hi, > > I'm beginning to study the numpy. > > When I open a terminal (Debian Squeeze) and run the python interpreter the > command "import numpy as np" run without errors. > > But when I run the same command on idle3 the following error appears. > import numpy as np > Traceback (most recent call last): > File "", line 1, in > import numpy as np > ImportError: No module named numpy > > How configure idle to load the numpy module? You don't by chance have Python 2 installed as well as Python 3, where Python 2 is associated with your terminal session? And your numpy module is for Python 2, not 3? That is my first thought, but I'm sure the experts will chime in shortly with a more definitive diagnosis. -- boB ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Idle - ImportError: No module named numpy
On 07/03/2015 00:42, WolfRage wrote: Well on the python interpretor did you use python3 or just python? Please don't top post on this list. It makes following long threads difficult if not impossible, and is basically downright irritating. Thanks for listening. -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Idle - ImportError: No module named numpy
On 03/06/2015 01:27 PM, Markos wrote: Hi, I'm beginning to study the numpy. And what does this have to do with the """Strengths & weaknesses of Python lists compared to "old school" arrays [Was "Fixed Vector Array"]""" thread? Please don't hijack a thread by replying with an unrelated message. Just start a new one with "Write email" or equivalent. Address it to tutor@python.org, and it'll be fine. When I open a terminal (Debian Squeeze) and run the python interpreter the command "import numpy as np" run without errors. But when I run the same command on idle3 the following error appears. >>> import numpy as np Traceback (most recent call last): File "", line 1, in import numpy as np ImportError: No module named numpy How configure idle to load the numpy module? As others have said, you probably have a version mismatch. When you ran Python from the terminal, what did you call it? Which version did you get? When you ran idle3, you presumably ran some version 3 installation of Python. From each interactive session, you can check the Python version with: import sys sys.version Unless they're identical in the two environments you describe, you can't assume they'll both have numpy loaded. -- DaveA ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
