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How do I unload (reload) a Python module?
...formation from: How do I really delete an imported module?
You can use sys.getrefcount() to find out the actual number of
references.
>>> import sys, empty, os
>>> sys.getrefcount(sys)
9
>>> sys.getrefcount(os)
6
>>> sys.getrefcount(empty)
3
Numbers g...
Format floats with standard json module
... it gives "Map object is not JSON serializable" error, but you can resolve converting the map() to a list with list( map(pretty_floats, obj) )
– Guglie
Oct 11 '18 at 23:54
...
Run a Python script from another Python script, passing in arguments [duplicate]
...
Try using os.system:
os.system("script2.py 1")
execfile is different because it is designed to run a sequence of Python statements in the current execution context. That's why sys.argv didn't change for you.
...
How do I check if I'm running on Windows in Python? [duplicate]
...
Specifically for Python 3.6/3.7:
os.name: The name of the operating
system dependent module imported. The
following names have currently been
registered: 'posix', 'nt', 'java'.
In your case, you want to check for 'nt' as os.name output:
import os
if os.name == 'nt':
...
There i...
How to properly ignore exceptions
...:
pass
The difference is that the first one will also catch KeyboardInterrupt, SystemExit and stuff like that, which are derived directly from exceptions.BaseException, not exceptions.Exception.
See documentation for details:
try statement
exceptions
...
Constantly print Subprocess output while process is running
...f nextline == '' and process.poll() is not None:
break
sys.stdout.write(nextline)
sys.stdout.flush()
output = process.communicate()[0]
exitCode = process.returncode
if (exitCode == 0):
return output
else:
raise ProcessException(command, e...
How to create a file with a given size in Linux?
...much worse once it gets very big, as it will allocate and read that amount into memory before writing. If this is somethig like bs=4GiB you'll probably end up swapping.
– Brian
Sep 29 '08 at 7:40
...
adding directory to sys.path /PYTHONPATH
...the working directory but before the standard interpreter-supplied paths. sys.path.append() appends to the existing path. See here and here. If you want a particular directory to come first, simply insert it at the head of sys.path:
import sys
sys.path.insert(0,'/path/to/mod_directory')
That s...
Print in one line dynamically
...any other languages). Here's a complete example based on your code:
from sys import stdout
from time import sleep
for i in range(1,20):
stdout.write("\r%d" % i)
stdout.flush()
sleep(1)
stdout.write("\n") # move the cursor to the next line
Some things about this that may be surprising...
Controlling a USB power supply (on/off) with Linux
...ernels.
# disable external wake-up; do this only once
echo disabled > /sys/bus/usb/devices/usb1/power/wakeup
echo on > /sys/bus/usb/devices/usb1/power/level # turn on
echo suspend > /sys/bus/usb/devices/usb1/power/level # turn off
(You may need to change usb1 to usb n)
Source: ...