Python

Python Debugger

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It’s pretty simple to have your python script jump out to the debugger.  Place these 2 lines right before where you want to start monitoring (otherwise, you’ll need to do a lot of stepping thru code).

import pdb
pdb.set_trace()

Some useful ones to remember are:

  • b: set a breakpoint
  • c: continue debugging until you hit a breakpoint
  • s: step through the code
  • n: to go to next line of code
  • l: list source code for the current file (default: 11 lines including the line being executed)
  • u: navigate up a stack frame
  • d: navigate down a stack frame
  • p: to print the value of an expression in the current context
Configurations, Git

Setting your git username and email address

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Single Repo

If you need to quickly set the user and email address for a single git repo, you can do this:


git config user.email john.doe@example.com
git config user.name "John Doe"

If you want to modify the .git/config file directly, you can add in this block:


[user]
name = John Doe
email = john.doe@example.com

All Repos


git config --global user.email john.doe@example.com
git config --global user.name "John Doe"

Utilities, Windows

Delete partitions on Drives (USB especially)

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Microsoft DiskPart version 6.2.9200

Copyright (C) 1999-2012 Microsoft Corporation.
On computer: COMPUTER

DISKPART> list disk

Disk ### Status Size Free Dyn Gpt
——– ————- ——- ——- — —
Disk 0 Online 298 GB 0 B
Disk 1 Online 7509 MB 6619 MB

DISKPART> select disk 1

Disk 1 is now the selected disk.

DISKPART> clean

DiskPart succeeded in cleaning the disk.

DISKPART> create partition primary

DiskPart succeeded in creating the specified partition.

DISKPART> exit

This info was copied from: http://geekswithblogs.net/ilich/archive/2013/04/26/recovering-unallocated-space-of-a-usb-flash-drive.aspx

Command Prompt, Configurations, Windows

Using xcopy to safely copy (and verify) files from one drive to another

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I recently upgraded my “data” drive from a 3TB to a WD Black 6TB Performance Desktop Hard Disk Drive – 7200 RPM SATA 6 Gb/s 128MB Cache 3.5 Inch drive.

Once I had both drives installed in the computer, it was time to copy data.

Head over to: Start Menu -> All Programs -> Accessories -> Command Prompt. Right click on it, and choose “Run as administrator”


xcopy f:\ e:\ /f /h /i /j /o /s /v /x 1>>c:\xferlog.txt 2>&1

Continue reading Using xcopy to safely copy (and verify) files from one drive to another →

Excel

In Excel, Splitting a Last_Name, First_Name cell, into 2 cells

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Assuming that cell B2 contains a name like, Dangerfield, Rodney, here are 2 formulas you can use to create 2 cells, one with the first name, one with the last name.

For the first name:
=RIGHT(B2,LEN(B2)-FIND(",",B2)-1)

and for the last name:
=LEFT(B2,FIND(",",B2)-1)

Next, copy those formulas down thru all apllicable rows.

Lastly, highlight the 2 columsn, right-click and choose Copy.
Then right-click on an empty column head to the right, and choose: Paste Values.

paste-as-values

Special Case

What if the name is really, “last_name, first_name middle_name”, and you don’t want the middle name?
=LEFT(RIGHT(B2,LEN(B2)-FIND(",",B2)-1),FIND(" ",RIGHT(B2,LEN(B2)-FIND(",",B2)-2)))

That’s great, but what if someone does NOT have a middle name?
Then you’ll get an error.
To solve for that, need to make it even fancier:
=IF(ISERROR(LEFT(RIGHT(B2,LEN(B2)-FIND(",",B2)-1),FIND(" ",RIGHT(B2,LEN(B2)-FIND(",",B2)-2)))),RIGHT(B2,LEN(B2)-FIND(",",B2)-1),LEFT(RIGHT(B2,LEN(B2)-FIND(",",B2)-1),FIND(" ",RIGHT(B2,LEN(B2)-FIND(",",B2)-2))))

Apache, Configurations

Apache and mod-rewrite – redirecting a folder to new server

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If you ever need to move one (or more) subdirectories, but not an entire site over to a new webserver, and you want to redirect the traffic, here’s how you can do it:


RewriteEngine On
RewriteRule ^directory_name(.*)$ http://www.example.com/directory_name [R=301,NC,L]

If you have multiple virtual hosts on the site, you might want to specify which host name’s directory_name should get sent to new server www.example.com

RewriteEngine On
RewriteCond %{HTTP_HOST} ^markcerv.com$ [OR]
RewriteCond %{HTTP_HOST} ^www.markcerv.com$
RewriteRule ^directory_name(.*)$ http://www.example.com/directory_name [R=301,NC,L]

Git, Shell Related

On Ubuntu 13+ and higher, /etc/bash_completion.d/git is now git-prompt

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In this previous post I wrote about how to get some git branch information into your shell. That was written back when Ubuntu 12 LTS was the standard.

I recently upgraded a box to Ubuntu 16 LTS, and this information went away. 🙁

I discovered via trial and error, that the call that’s needed in .bashrc is now:

## To show you what branch you are in as you move around git repos
##
if [ -f /etc/bash_completion.d/git-prompt ]; then
. /etc/bash_completion.d/git-prompt
PS1='\[\u@\h \e[33m\]\w\[\e[0m\] $(__git_ps1 " (%s)")\n\$ '
fi


/etc/bash_completion.d/git is now: /etc/bash_completion.d/git-prompt

Git

Fetch a remote branch that doesn’t exist locally using git

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Say you are working on not your normal computer and are working on a branch that isn’t quite ready to get merged with the official git repo for the codebase. Here’s what you can do:

[bash]
git push SOME_OTHER_ORIGIN branch_name –tags –set-upstream
[/bash]

Then, when you get back to the computer you normally work on, you can do this:

[bash]
git fetch SOME_OTHER_ORIGIN

git checkout -b branch_name
# which will switch you to that branch

$ git fetch SOME_OTHER_ORIGIN branch_name
Password for ‘https://you@git.place’:
From https://git.place/….
* branch branch_name -> FETCH_HEAD

# Check this is what you want:
$ git log ..FETCH_HEAD

# if it is, then
$ git merge –no-ff FETCH_HEAD | more
[/bash]

NOTE: You might need to hide some local files that get gotten in the 1st place.