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@yzhong52
yzhong52 / readme.md
Created Sep 2, 2019
Differences between Numpy array and regular python array
View readme.md

In regular python array, a slice view of an array is actually a copy. Modifiying elements through the slice won't affect the original array.

>>> arr = [0, 1, 2]
>>> arr[0:][0] = 100
>>> arr
[0, 1, 2]
@yzhong52
yzhong52 / gist:270dbcc7fb1c80303c8111109446ae96
Created Aug 13, 2019
sudo systemctl status -l -n 20 prometheus.service
View gist:270dbcc7fb1c80303c8111109446ae96
[CA2 yzhong@ca2-p1v01-mon4-0001 ~]$ sudo systemctl status -l -n 20 prometheus.service
● prometheus.service - Prometheus
Loaded: loaded (/etc/systemd/system/prometheus.service; enabled; vendor preset: disabled)
Active: active (running) since Fri 2019-08-09 17:04:21 UTC; 4 days ago
Process: 16654 ExecReload=/bin/kill -s HUP $MAINPID (code=exited, status=0/SUCCESS)
Main PID: 15929 (prometheus)
CGroup: /system.slice/prometheus.service
└─15929 /opt/prometheus/prometheus/prometheus --config.file /opt/prometheus/prometheus/prometheus.yml --storage.tsdb.path=/srv/prometheus/prometheus --storage.tsdb.retention=120d --web.listen-address=0.0.0.0:9090
Aug 13 21:19:42 ca2-p1v01-mon4-0001.ca2.internal.zone prometheus[15929]: level=warn ts=2019-08-13T21:19:42.797Z caller=manager.go:513 component="rule manager" group=HoustonDashboard msg="Evaluating rule failed" rule="alert: HoustonDashboardBackendErrorRate\nexpr: ((sum by(instance) (rate(haproxy_backend_http_responses_total{backend=~\"houston-dashboa
@yzhong52
yzhong52 / gist:aaea17f43a5578473d26d0fdba9973bf
Created Aug 13, 2019
sudo systemctl status -l -n 20 prometheus.service
View gist:aaea17f43a5578473d26d0fdba9973bf
[CA2 yzhong@ca2-p1v01-mon4-0001 ~]$ sudo systemctl status -l -n 20 prometheus.service
● prometheus.service - Prometheus
Loaded: loaded (/etc/systemd/system/prometheus.service; enabled; vendor preset: disabled)
Active: active (running) since Fri 2019-08-09 17:04:21 UTC; 4 days ago
Process: 16654 ExecReload=/bin/kill -s HUP $MAINPID (code=exited, status=0/SUCCESS)
Main PID: 15929 (prometheus)
CGroup: /system.slice/prometheus.service
└─15929 /opt/prometheus/prometheus/prometheus --config.file /opt/prometheus/prometheus/prometheus.yml --storage.tsdb.path=/srv/prometheus/prometheus --storage.tsdb.retention=120d --web.listen-address=0.0.0.0:9090
Aug 13 21:19:42 ca2-p1v01-mon4-0001.ca2.internal.zone prometheus[15929]: level=warn ts=2019-08-13T21:19:42.797Z caller=manager.go:513 component="rule manager" group=HoustonDashboard msg="Evaluating rule failed" rule="alert: HoustonDashboardBackendErrorRate\nexpr: ((sum by(instance) (rate(haproxy_backend_http_responses_total{backend=~\"houston-dashboa
@yzhong52
yzhong52 / Readme.md
Last active Feb 20, 2018
alias_gen.py
View Readme.md

alias generation

Genereate alias for each of the git folder in ~/Documents.

  1. Run the script python3 alia_gen.py
  2. Add the following to .bash_profile
# Added by Yuchen: using alias!
if [ -f ~/.alias_gen ]; then 
View replace_or_fail.sh
#!/usr/bin/env bash
replace_or_fail() {
FROM_VALUE=$1
TO_VALUE=$2
FILENAME=$3
echo "Replace from '$FROM_VALUE' to '$TO_VALUE' in '$FILENAME'... "
grep -q ${FROM_VALUE} ${FILENAME} && sed -i.old 's/'${FROM_VALUE}'/'${TO_VALUE}'/' ${FILENAME} || ( (>&2 echo "\033[0;31mError: '$FROM_VALUE' not found") && exit 1 )
echo "Done. "
}
@yzhong52
yzhong52 / readme.md
Last active Aug 19, 2017
Sublime Text Settings: Auto Intent, Tap to Spaces, Rulers
View readme.md

Preferences > Key Bindings:

[
    { "keys": ["alt+command+l"], "command": "reindent" , "args": {"single_line": false}}
]

Preferences > Settings:

@yzhong52
yzhong52 / Makefile
Last active Jun 25, 2017 — forked from Wenchy/Makefile
Compile all .cpp files into one target under the current directory.
View Makefile
CC := g++
CFLAGS := -Wall -g
TARGET := example
# $(wildcard *.cpp /xxx/xxx/*.cpp): get all .cpp files from the current directory and dir "/xxx/xxx/"
SRCS := $(wildcard *.cpp)
# $(patsubst %.cpp,%.o,$(SRCS)): substitute all ".cpp" file name strings to ".o" file name strings
OBJS := $(patsubst %.cpp,%.o,$(SRCS))
all: $(TARGET)
@yzhong52
yzhong52 / gist:f81e929e5810271292bd08856e2f4512
Created Apr 23, 2017
Create Spark DataFrame From List[Any]
View gist:f81e929e5810271292bd08856e2f4512
// Spark 2.1
val spark = SparkSession.builder().master("local").getOrCreate()
// Given a list of mixture of strings in integers
val values = List("20030100013280", 1.0)
// Create `Row` from `Seq`
val row = Row.fromSeq(values)
// Create `RDD` from `Row`
@yzhong52
yzhong52 / Dropbox Style Filename
Last active Jan 5, 2020
Rename files based on their created date
View Dropbox Style Filename
Dropbox Style Filename
@yzhong52
yzhong52 / send_an_email.py
Created May 18, 2014
Send an email with a gmail account using python 3
View send_an_email.py
# smtplib module send mail
import smtplib
TO = 'recipient@mailservice.com'
SUBJECT = 'TEST MAIL'
TEXT = 'Here is a message from python.'
# Gmail Sign In
gmail_sender = 'sender@gmail.com'
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