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How does a debugger work?
...f how a debugger works will depend on what you are debugging, and what the OS is. For native debugging on Windows you can find some details on MSDN: Win32 Debugging API.
The user tells the debugger which process to attach to, either by name or by process ID. If it is a name then the debugger will l...
Import multiple csv files into pandas and concatenate into one DataFrame
...like an old fashioned aka manual way of doing things, esp. as the Hapood ecosystem has growing list of tools where you can perform sql queries directly on many different directories containing different file types (csv, json, txt, databases) as if it was one data source. There must be something si...
Relative imports in Python 3
... the relative import...
from .mymodule import as_int
The way you're supposed to run it is...
python3 -m mypackage.myothermodule
...but it's somewhat verbose, and doesn't mix well with a shebang line like #!/usr/bin/env python3.
The simplest fix for this case, assuming the name mymodule is glo...
Getting file size in Python? [duplicate]
...
Use os.path.getsize(path) which will
Return the size, in bytes, of path. Raise OSError if the file does not exist or is inaccessible.
import os
os.path.getsize('C:\\Python27\\Lib\\genericpath.py')
Or use os.stat(path).st_...
Do on-demand Mac OS X cloud services exist, comparable to Amazon's EC2 on-demand instances? [closed]
Amazon's EC2 service offers a variety of Linux and Windows OS choices, but I haven't found a service offering a similar "rent by the hour" service for a remote Mac OS X virtual machine. Does such a service exist? (iCloud looks to be just a data storage service, rather than a service allowing remot...
Library not loaded: libmysqlclient.16.dylib error when trying to run 'rails server' on OS X 10.6 wit
...
For those who are curious what's going on, this command makes a symbolic link from the second location to the first. When the gem looks for the MySQL client library under /usr/lib, that link will resolve to the location where it's ...
Redirecting stdout to “nothing” in python
...
Cross-platform:
import os
import sys
f = open(os.devnull, 'w')
sys.stdout = f
On Windows:
f = open('nul', 'w')
sys.stdout = f
On Linux:
f = open('/dev/null', 'w')
sys.stdout = f
...
How to fix “Attempted relative import in non-package” even with __init__.py
...
@MarkAmery Almost lost my mind trying to grok how all this works, relative imports within a project with subdirectories with py files that have __init__.py files yet you keep getting the ValueError: Attempted relative import in non-package...
How to hide output of subprocess in Python 2.7
...
Redirect the output to DEVNULL:
import os
import subprocess
FNULL = open(os.devnull, 'w')
retcode = subprocess.call(['echo', 'foo'], stdout=FNULL, stderr=subprocess.STDOUT)
It is effectively the same as running this shell command:
retcode = os.system("echo 'fo...
Rename multiple files in a directory in Python [duplicate]
...
Use os.rename(src, dst) to rename or move a file or a directory.
$ ls
cheese_cheese_type.bar cheese_cheese_type.foo
$ python
>>> import os
>>> for filename in os.listdir("."):
... if filename.startswith("chee...