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Generating a Fixed alpha + sequential numeric values in python


Generating a Fixed alpha + sequential numeric values in python

By : user2185115
Date : November 20 2020, 04:01 AM
wish helps you For default Django models use AutoField as id. It's autoincremented. And you can write a property for your model to return the result you are expecting:
code :
class MyModel(models.Model):

    @property
    def item_name(self):
        return f'ITEM{self.id}'

my_model_instance1 = Model.objects.create()
my_model_instalce1.id = 1
my_model_instance1.item_name = 'ITEM1'

my_model_instance2 = Model.objects.create()
my_model_instalce2.id = 2
my_model_instance2.item_name = 'ITEM2'
class MyModel(models.Model):
    item = models.CharField(max_length=255) 

    def item_name(self):
        return f'ITEM{self.id}'   

    def save(self, *args, **kwargs):
        if not self.item:
            self.item = self.item_name()
        super(MyModel, self).save(*args, **kwargs)


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How can I make 5 digit alpha numeric sequential string

How can I make 5 digit alpha numeric sequential string


By : Sarnse
Date : March 29 2020, 07:55 AM
To fix this issue Can i get logic to make 5 digit alpha numeric sequential string.
code :
function seq4($input){

        $i=0;$var = 'A';

        $max_lenght     =  5;       $length         =  strlen($input);
                if($length>$max_lenght){            while($input >= 10000){
                $input = $input - 10000;                
                $i++;           }

            $i=$i-9;
                        while($i > 1){                 
                $i--;         
                $var++.'';
             }

             $bal_lenght    = $max_lenght - ($str_lenght = strlen($var));  
             $string        = $var.str_pad($input, $bal_lenght, "0", STR_PAD_LEFT);
             $string_lenght = strlen($string);
             return ($string_lenght>$max_lenght)?false:$string;                             } else {
             return str_pad($input, 5, "0", STR_PAD_LEFT);      }   }
Generating a Random number in C# with Alpha numeric values

Generating a Random number in C# with Alpha numeric values


By : Ivan Marques
Date : March 29 2020, 07:55 AM
Hope this helps That example is totally wrong. As written in the comments on the original answer, that example is biased... plus it creates useless arrays just to overwrite them immediately... and calls the random number method twice. A better example should be:
code :
public static string GetUniqueKey(int size = 6, string chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890")
{
    using (var crypto = new RNGCryptoServiceProvider())
    {
        var data = new byte[size];

        // If chars.Length isn't a power of 2 then there is a bias if
        // we simply use the modulus operator. The first characters of
        // chars will be more probable than the last ones.

        // buffer used if we encounter an unusable random byte. We will
        // regenerate it in this buffer
        byte[] smallBuffer = null;

        // Maximum random number that can be used without introducing a
        // bias
        int maxRandom = byte.MaxValue - ((byte.MaxValue + 1) % chars.Length);

        crypto.GetBytes(data);

        var result = new char[size];

        for (int i = 0; i < size; i++)
        {
            byte v = data[i];

            while (v > maxRandom)
            {
                if (smallBuffer == null)
                {
                    smallBuffer = new byte[1];
                }

                crypto.GetBytes(smallBuffer);
                v = smallBuffer[0];
            }

            result[i] = chars[v % chars.Length];
        }

        return new string(result);
    }
}
Python regex alpha-numeric string with numeric part between two values

Python regex alpha-numeric string with numeric part between two values


By : user6024962
Date : March 29 2020, 07:55 AM
will be helpful for those in need You can use re.findall() to search along with regex.
Explanation of regex as below:
code :
key_string\s+\((\d+)\s+bytes\)
import re

with open('result.txt') as fh:
    for l in fh:
        a = re.findall(r"key_string\s+\((\d+)\s+bytes\)",l.strip())
        if len(a) > 0 and int(a[0]) < 1200:
            print (l)
C:\Users\dinesh_pundkar\Desktop>python c.py
key_string (870 bytes)

key_string (70 bytes)

C:\Users\dinesh_pundkar\Desktop>
import re

pattern = r'key_string\s+\((\d+)\s+bytes\)'
regex = re.compile(pattern, re.IGNORECASE)
with open('result.txt') as fh:
    for match in regex.finditer(fh.read()):
        if int(match.group(1)) < 1200:
            print((match.group()))
Challenge: Recode data from Alpha to Non sequential Numeric

Challenge: Recode data from Alpha to Non sequential Numeric


By : neha chavan
Date : March 29 2020, 07:55 AM
Any of those help We are looking for a blazing fast solution to the following problem, in R (Rcpp is allowed). , We can put the vector in a named numeric vector
code :
vec <-  c("A" = 5, "B" = 4, "C" = 3, "D" = 1)
get_recoded_data <- function(num_vec, recode_data) {
   unname(recode_data[match(num_vec, names(recode_data))]) 
}
get_recoded_data(x, vec)
system.time(get_recoded_data(x, vec))
#user  system elapsed 
#0.028   0.004   0.032 
get_recoded_data <- function(num_vec, recode_data) {
  unname(recode_data[fmatch(num_vec, names(recode_data))]) 
}
system.time(get_recoded_data(x, vec))
#user  system elapsed 
#0.017   0.004   0.021 
Python + Regex + CSV + Pandas : failed to produce numeric values from alpha-numeric values

Python + Regex + CSV + Pandas : failed to produce numeric values from alpha-numeric values


By : user2578647
Date : March 29 2020, 07:55 AM
this will help As you want to change any text like 1 pkt to 1, rather than splitting using [a-z]+, it should be better to substitute and change this line:
code :
item[3] = re.split('[a-z]+', item[3])[0]
item[3] = re.sub(r'\D*', '', str(item[3]))
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