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Flatten an irregular list of lists
... your example a little easier to read and probably boost the performance.
Python 2
def flatten(l):
for el in l:
if isinstance(el, collections.Iterable) and not isinstance(el, basestring):
for sub in flatten(el):
yield sub
else:
yield el
...
Why do you need to create a cursor when querying a sqlite database?
I'm completely new to Python's sqlite3 module (and SQL in general for that matter), and this just completely stumps me. The abundant lack of descriptions of cursor objects (rather, their necessity) also seems odd.
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What does the restrict keyword mean in C++?
...
load R2 ← *b
add R2 += R1
set R2 → *b
Does GCC really do it?
g++ 4.8 Linux x86-64:
g++ -g -std=gnu++98 -O0 -c main.cpp
objdump -S main.o
With -O0, they are the same.
With -O3:
void f(int *a, int *b, int *x) {
*a += *x;
0: 8b 02 mov (%rdx),%eax
2: 01 07 ...
Usage of sys.stdout.flush() method
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Python's standard out is buffered (meaning that it collects some of the data "written" to standard out before it writes it to the terminal). Calling sys.stdout.flush() forces it to "flush" the buffer, meaning that it will wri...
What's the difference between hard and soft floating point numbers?
...the libc needs a float it is passed in a way the library understands.
The Linux kernel can support emulation of the VFP instructions. Obviously, you are better off to compile with -mfpu=none for this case and have the compile generate code directly instead of relying on any Linux kernel emulation....
How do I use Django templates without the rest of Django?
I want to use the Django template engine in my (Python) code, but I'm not building a Django-based web site. How do I use it without having a settings.py file (and others) and having to set the DJANGO_SETTINGS_MODULE environment variable?
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Django 1.7 - makemigrations not detecting changes
... need to do one pre-step (as I found out) listed in the documentation:
python manage.py makemigrations your_app_label
The documentation does not make it obvious that you need to add the app label to the command, as the first thing it tells you to do is python manage.py makemigrations which wil...
How do I install the OpenSSL libraries on Ubuntu?
...s the right reference here: technologyskill.ga/install-openssl-manually-on-linux or howtoforge.com/tutorial/… libraries and header files are found under the same directory after installation: /usr/local/ssl
– MickaelT
Jan 22 '19 at 22:37
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Read Excel File in Python
...dings:")
print(DataF.columns)
Test at :https://repl.it
Reference: https://pythonspot.com/read-excel-with-pandas/
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How to get a list of current open windows/process with Java?
...ication that does the job for you and then screenscraping the output (like Linux's ps and Window's tasklist).
Unfortunately, that'll mean you'll have to write some parsing routines to read the data from both.
Process proc = Runtime.getRuntime().exec ("tasklist.exe");
InputStream procOutput = proc...