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Wednesday, 12. February 2020
apply colors to pandas

Here is how to change the color of negative values to red in pandas.

def color_negative_red(val):
color = 'red' if val < 0 else 'black'
return 'color: %s' % color

df = df.style.applymap(color_negative_red)

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Tuesday, 11. February 2020
change log file size in MySQL

Here are the steps to be followed while changing the log file size in mysql:

1) SET GLOBAL innodb_fast_shutdwn = 1;
2) Stop the mysqld server and check the end of the error log file to ensure that the shutdown was clean.
3) Move the existing log files to another location for extra safety.
4) Make the size change in the my.cnf and restart.

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Holidays in India

These are the common holidays celebrated in India (Mumbai) during 2016 - 17

08-April Friday Guddi Padwa
1-May Sunday Maharashtra Day
15-Aug Monday Independence Day
05-Sept Monday Ganesh Chaturthi
02-Oct Sunday Gandhi Jayanti
11-Oct Tuesday Dussehra
30-Oct Sunday Diwali
31-Oct Monday Lakshmi Pooja
25-Dec Sunday Christmas
26-Jan Thursday Republic Day
13-March Monday Holi


List FY 2013- 14
Gudi Padwa 11-Apr Thursday
Maharshtra Day 1-May Wednesday
Independence Day 15-Aug Thursday
Rakshabandhan 21-Aug Wednesday
Ganesh Chaturthi 9-Sep Monday
Gandhi Jayanti 2-Oct Wednesday
Dasera 14-Oct Monday
Laxmi Puja 3-Nov Sunday
New Year 4-Nov Monday
Bhai Duj 5-Nov Tuesday
Chirstmas 25-Dec Wednesday
Republic Day 26-Jan Sunday
Holi 17-Mar Monday
Gudi Padwa 31- Mar-2014 Monday

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MySQL common error messages

1146 Table does not exist
1054 column does not exist
1062 duplicate entry for primary key
1406 Data too long for column
1064 sql syntax error
1111 invalid use of group function
1366 incorrect integer value
1046 No database selected

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Sunday, 9. February 2020
ipython parallel demo

First start ipython in cluster mode

ipcluster start -n 4

from IPython.parallel import Client
rc = Client()
v=rc.load_balanced_view()
@v.parallel(block=True)
def f(x): return 2*x
result = f.map(range(10))
print("Using a parallel function: ", result)

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djanog settings

You may see this message if you have DEBUG = True in your Django settings file and you haven't configured any URLs.

django-admin.py startproject todo

python manage.py runserver localhost:8000

$$ If you plan to use a database, edit the DATABASES setting in todo/settings.py.
python manage.py startapp todoapp

$$ syncdb and flush are other 2 parameters accepted by manage.py

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Saturday, 8. February 2020
clear tmp folder

Here is following commands to clear unwanted stuff from the /tmp partition on the server?

tmpwatch –mtime –all 48 /tmp

The above command will remove all files and folders from the /tmp which have not been accessed in the last couple of days (24×2=48). You can modify the number of hours as required.

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change your server time to IST

If you need to change your server clock to another timezone for e.g. (Indian Standard Time), you can do so by modifying the /etc/localtime file:

mv /etc/localtime /etc/localtime.bak

ln -s /usr/share/zoneinfo/Asia/Calcutta /etc/localtime

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Transfer root emails to another email address

If you have root access to the server then open the file /etc/aliases in your favorite editor. Look for the section Person who should get root mail and make the change as required.

vim /etc/aliases

Person who should get root’s mail ##
root: info@unixserveradmin.com

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special strings in cron

Instead of the first five fields, you can use any one of eight special strings. It will not just save your time but it will improve readability.

Special string Meaning
@reboot ——> Run once, at startup.
@yearly ——> Run once a year, “0 0 1 1 ”.
@annually –> (same as @yearly)
@monthly —> Run once a month, “0 0 1
”.
@weekly —–> Run once a week, “0 0
0″.
@daily ——–> Run once a day, “0 0
”.
@midnight –> (same as @daily)
@hourly —–> Run once an hour, “0 ”.

For e.g. run ntpdate every hour:
@hourly /path/to/ntpdatevim /etc/ssh/sshd_config

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