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Better to 'try' something and catch the exception or test if it's possible first to avoid an excepti
...n encourages the use of exceptions, which you handle is a phrase from Dive Into Python. Your example not only handles the exception (gracefully), rather than letting it silently pass, also the exception occurs only in the exceptional case of index not being found (hence the word exception!).
clea...
How do I add a path to PYTHONPATH in virtualenv
...t folder
$ add2virtualenv folder_to_add
console will display
Warning: Converting "folder_to_add" to "/absoutle/path/to/folder_to_add"
That's it, and you should be good to go
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improve t...
How do I capture SIGINT in Python?
...env python
import signal
import sys
def signal_handler(sig, frame):
print('You pressed Ctrl+C!')
sys.exit(0)
signal.signal(signal.SIGINT, signal_handler)
print('Press Ctrl+C')
signal.pause()
Code adapted from here.
More documentation on signal can be found here.
...
python: Change the scripts working directory to the script's own directory
...dirname(abspath)
os.chdir(dname)
This takes the filename of your script, converts it to an absolute path, then extracts the directory of that path, then changes into that directory.
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Add a column to a table, if it does not already exist
I want to write a query for MS SQL Server that adds a column into a table. But I don't want any error display, when I run/execute the following query.
...
Fast Linux File Count for a large number of files
...t program, like this:
#include <stdio.h>
#include <dirent.h>
int main(int argc, char *argv[]) {
DIR *dir;
struct dirent *ent;
long count = 0;
dir = opendir(argv[1]);
while((ent = readdir(dir)))
++count;
closedir(dir);
printf("%s contains %ld ...
Convert UNIX epoch to Date object
...
I have timestamps like 1415560016876. epochconverter.com converts this to a date with no problem. Your code above gives me stuff like "46832-11-09 12:47:33 EDT"...
– Hack-R
Nov 17 '14 at 19:43
...
How should I print types like off_t and size_t?
...ee that ssize_t has the same size as size_t, so truly portable code should convert it to intmax_t and print with %jd just like off_t.
– nwellnhof
Sep 30 '17 at 15:11
...
Getting command-line password input in Python
...t error I got was a TypeError for the 'passwor += x' line. It said: "can't convert bytes object to str implicitly". I changed the line so that I explicitly cast x to string such as: "password += str(x)". But the code still does not work. When I run it, it doesn't prompt me for input, it just prints ...
How to fetch the row count for all tables in a SQL SERVER database [duplicate]
...tabase:
CREATE TABLE #counts
(
table_name varchar(255),
row_count int
)
EXEC sp_MSForEachTable @command1='INSERT #counts (table_name, row_count) SELECT ''?'', COUNT(*) FROM ?'
SELECT table_name, row_count FROM #counts ORDER BY table_name, row_count DESC
DROP TABLE #counts
The output will...