I have a checkbox in my Django jinja template. I want that checkbox to be checked if object boolean field is True. My html element looks like: The problem is, checkbox is still checked when attribute checked=”False”, it’s becomes unchecked only when the checked attribute is not there. So wha…
Tag: python-2.7
WTForms-JSON not working with FormFields
Nested forms (FormFields) doesn’t get populated with data when I use WTForms-JSON. I can’t spot my mistake, see example below. I send the following JSON-request but the print after form.from_json(request.json) reveals that the address object is never populated with data (also, the “appropria…
How can you slice with string keys instead of integers on a python OrderedDict?
Since an OrderedDict has the features of both a list (with ordered elements), and a dictionary (with keys instead of indexes), it would seem natural that you could slice using keys. What’s interesting about this is that it’s not the error you’d see due to OrderedDictionary.__getslice__ not b…
How to convert bytearray with non-ASCII bytes to string in python?
I don’t know how to convert Python’s bitarray to string if it contains non-ASCII bytes. Example: In my example, I just want to somehow get a string ‘x9f’ back from the bytearray. Is that possible? Answer In Python 2, just pass it to str(): In Python 3, you’d want to convert it ba…
Dynamically creating Django models with `type`
I have 20+ MySQL tables, prm_a, prm_b, … with the same basic structure but different names, and I’d like to associate them with Django model classes without writing each one by hand. So, feeling ambitious, I thought I’d try my hand at using type() as a class-factory: The following works: But…
How to get PID by process name?
Is there any way I can get the PID by process name in Python? For example I need to get 3110 by chrome. Answer You can get the pid of processes by name using pidof through subprocess.check_output: check_output([“pidof”,name]) will run the command as “pidof process_name”, If the return …
How To Mask Out Lower ‘x’ Bits of Python Integer Of Unknown Size
I am looking for a way to mask out (set to ‘0’) the lowest four bits of an integer in Python when I don’t know the total length of the number. If I knew the length of the integer beforehand I could just set the rest of the mask to 0xff, for instance if the integer would always be 32
nltk download url authorization issue
I tried to update my nltk data with nltk.download() but I got HTTP Error 401: Authorization Required. When I traced the url in question, I found it in downloader.py DEFAULT_URL = ‘http://nltk.googlecode.com/svn/trunk/nltk_data/index.xml’ I then copied that URL and ran it in my browser to find out …
How to print the filename returned by askopenfilename?
As the codes show, I wanted to print the file name. It printed this line How can I just get the filename with its extension? e.g “Tonight.mp3” Answer Exclude the call to open: If you want only the filename (excluding directory path), use os.path.basename:
ImportError: No module named scipy
I am using Python 2.7 and trying to get PyBrain to work. But I get this error even though scipy is installed – I have installed scipy using this command – I get – What should I do? Answer Try to install it as a python package using pip. You said you already tried: Now run: I ran both and