Forem: udomsak

Python generate Birth date ( Quiz )

udomsak — Wed, 15 May 2019 18:23:00 +0000

Today After end of work as Pizza Boy ( As delivery guy / call GrabBike. So i'm sitting front of my laptop found my follower in twitter talking about "function to Generate birth date" as quiz.

Then i try to solve this simple quiz with my self got it with 2 version one use of yield and second use more with lambda.

Version 1.

I use datetime function to limit current year then use random() with randrange method to get number from range that i limit it in range() function.

import random
from datetime import datetime


def genDateOfBirth(number=1):
    CurrentTime = datetime.now()
    Year = random.randrange(1911, CurrentTime.year)
    for item in range(number):
        yield random.randrange(1911,CurrentTime.year), random.randrange(1, 12), random.randrange(1, 31)

dateTimeThatIwant = genDateOfBirth(12)

for year, month, date in dateTimeThatIwant:
    print("GenDate in yyyy-mm-dd  as %s-%s-%s" % (year, month, date))

Version 2.

However, I have some question that

Can i refactor my code shorten ?.
Can i specify start year of computer usage that python use ?.

So got it use lambda and list-comprehension compound.


import random
from datetime import datetime
from time import gmtime

# gmtime(0) you will get epoch first year = 1970 
# read more -> https://en.wikipedia.org/wiki/System_time 

startYear = gmtime(0)
CurrentYear = datetime.now()

dateTimeGeneratorList = lambda numberOflist : [(yield random.randrange(startYear.tm_year, currentYear.year), random.randrange(1,12), 
random.randrange(1,31)) for item in range(numberOflist)]

# 12 if number of list that we need to printout .

for year, month, date in dateTimeGeneratorList(12):
   print("%s-%s-%s " % (year, month, date))

Done!! But, Can i make it better ? :)

It's possible to pare JSON via DSL or dynamic input template in Golang

udomsak — Fri, 15 Mar 2019 17:27:23 +0000

Example

Input

{
   "name" : "udomsak",
   "dataForm" : { 
     "attribute1": "myname is"
     "gender" : "male",
     "location": "Mars"
}

Parser Language

This parser language is Dynamic and does not need to compile in Struct in Golang. that mean can get from database or file use as parser.

ParserGet:
  - name
  - dataForm.gender 
  - dataForm.location

Example request

ProjectA:

http://api.example.com/parser-rule/parser1
  - parser1 load from parser rule file :  "parser1.rule.conf"

ProjectB:
http://api.example.com/parser-rule/parser2
  - parser1 load from parser rule file :  "parser2.rule.conf"

NOTE-What is Sequence use in Postgresql

udomsak — Sun, 10 Mar 2019 14:57:27 +0000

A sequence is a special kind of database object designed for generating unique numeric identifiers. It is typically used to generate artificial primary keys. Sequences are similar, but not identical, to the AUTO_INCREMENT concept in MySQL.

Thai

Sequence คือ Database object ใน PostgreSQL ปกติใช้ในการ generate key ( ใช้สำหรับ primary keys ) Sequence จะว่าไปก็คล้ายๆ กับ Auto-increment ใน MySQL.

หมดปัญหาไปเรื่อง Key ชนกัน เพราะ Sequence ออกแบบมาเพื่อการนี้อยู่แล้ว

Link : http://www.neilconway.org/docs/sequences/