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File I/O in Every Programming Language [closed]
...
Python 3
with open('fileio.txt', 'w') as f:
f.write('hello')
with open('fileio.txt', 'a') as f:
f.write('\nworld')
with open('fileio.txt') as f:
s = f.readlines()[1]
print(s)
Clarifications
readlines() returns a...
Gray out image with CSS?
...img.jpg" /></a>
Css Gray:
img{
filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/><...
How to remove all of the data in a table using Django
...emove all the data from all your tables, you might want to try the command python manage.py flush. This will delete all of the data in your tables, but the tables themselves will still exist.
See more here: https://docs.djangoproject.com/en/1.8/ref/django-admin/
...
Create numpy matrix filled with NaNs
...atives a[:] = numpy.nan here and a.fill(numpy.nan) as posted by Blaenk:
$ python -mtimeit "import numpy as np; a = np.empty((100,100));" "a.fill(np.nan)"
10000 loops, best of 3: 54.3 usec per loop
$ python -mtimeit "import numpy as np; a = np.empty((100,100));" "a[:] = np.nan"
10000 loops, best of...
Set Django IntegerField by choices=… name
...es
super(models.IntegerField, self).__init__(**kwargs)
def to_python(self, value):
return self.val2choice[value]
def get_db_prep_value(self, choice):
return self.choice2val[choice]
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Python list directory, subdirectory, and files
...nd not root in the concatenation, since using root would be incorrect.
In Python 3.4, the pathlib module was added for easier path manipulations. So the equivalent to os.path.join would be:
pathlib.PurePath(path, name)
The advantage of pathlib is that you can use a variety of useful methods on pat...
How can I change a file's encoding with vim?
...g too big hammer for too small nail.
Just:
iconv -f utf-16 -t utf-8 file.xml > file.utf8.xml
And you're done.
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Activate a virtualenv via fabric as deploy user
... answer, virtualenv contextmanager declaration could be done in 5 lines on Python 2.6+, however it is never guaranteed that 'workon' alias is always imported correctly, and it's much more reliable to use `source .../activate' command
– Alex Volkov
Feb 18 '15 at...
When to use Spring Integration vs. Camel?
...vantages:
Many, many more technologies are supported.
Besides, a (good) XML DSL, there are fluent APIs for Java, Groovy and Scala.
Because Apache Camel has very good integration with Spring, I would even use it instead of Spring Integration in most Spring projects.
If you need more details, yo...
Tool for adding license headers to source files? [closed]
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Python solution, modify for your own need
Features:
handles UTF headers (important for most IDEs)
recursively updates all files in target directory passing given mask (modify the .endswith parameter for the filemask of you...