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Display all databases names from a given ip, port, username and password using python

I need to show all found databases name.
I have found solutions that obtain information from a known database but in my case I do not know the 'database_name.db'.
someone can help me please!

well, you don't have to :
psql -h localhost -U pguser -c '\l'
this way you will connect to default database (called postgres).
postgres connections need to connect to a database.
output:
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+----------+----------+-------------+-------------+-----------------------
mytestdb | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 |
imdb | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 |
postgres | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 |
template0 | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | en_CA.UTF-8 | en_CA.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres

Storing Imagehash in mysql database

I am trying to save hash_value in mysql database using python. I have obtained hash value hash = imagehash.dhash(Image.open('temp_face.jpg')) but after the execution of insert query cursor.execute("INSERT INTO image(hash,name,photo) VALUES(%d,%s,%s )", (hash,name, binary_image))it gives me error "Python 'imagehash' cannot be converted to a MySQL type".
| Field | Type | Null | Key | Default | Extra |
+---------+-------------+------+-----+-------------------+-------------------+
| hash | binary(32) | NO | PRI | NULL | |
| name | varchar(25) | NO | | NULL | |
| photo | blob | NO | | NULL | |
| arrival | datetime | NO | | CURRENT_TIMESTAMP | DEFAULT_GENERATED |
+---------+-------------+------+-----+-------------------+-------------------+
So what can be done to store the value or is there any other way to do the same task?

How to insert hex /binary ? into a mysql database?

i am trying to insert some hex values into a field of a mysql db
this is the kind of value i need to insert :
['D\x93\xb4s\xa5\x9eM\\\x14\xf3*\x95\xf9\x83\x1d*%P\xdb\xa2', 'D\xbf\xef\xb0\xc8\xff\x17\xc6Y6\xc6\xb4,p\xaa\xb1\xf2V\xdaa', 'D\xd7~~\x02\xd3|}\xfcN\xc1\x03\x97\x07\xb5<U\x16Y\x9e', '\xf3\xb6\xc2,Y/[i\x98\x93\x9d\xb2R\x93\x84\x12W\x1a3\x19', '\xf3\xb7\xce\x1f-n\x89\xb6\x87K\x9dsf\xcb=w\xab\x1a\xa0<', '\xf3\xbf7\x04d\xe6\xdf\xf8"9\x1d\x05\x01\xe4\xd4\xb0\xad\x80\xc0\xf5']
this is my table
+--------------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------------+--------------+------+-----+---------+-------+
| consensus | char(40) | NO | | NULL | |
| identityb32 | char(40) | NO | | NULL | |
| pubdate | char(40) | NO | | NULL | |
| dirport | char(6) | NO | | NULL | |
| ip | char(40) | NO | | NULL | |
| orport | char(40) | NO | | NULL | |
| identityhash | char(40) | NO | | NULL | |
| nick | char(40) | NO | | NULL | |
| version | char(40) | NO | | NULL | |
| flags | varchar(500) | NO | | NULL | |
| identity | char(40) | NO | | NULL | |
| digest | char(40) | NO | | NULL | |
| pubtime | char(40) | NO | | NULL | |
+--------------+--------------+------+-----+---------+-------+
13 rows in set (0.00 sec)
currently i am adding the hex data as i would do a normal string but this results in a non readable input being added:
D??s??M?*???*%P?
how can the hex data be added?

Check CHARSET
CREATE TABLE `t` (
`id` varchar(32) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8

Maybe the way really is HEX() and UNHEX() functions. But, this post maybe help Inserting hex value mysql

Those aren't hex values.
I may be way off on this, but the only way I found to insert your values, was like this:
$string = 'D\x93\xb4s\xa5\x9eM\\\x14\xf3*\x95\xf9\x83\x1d*%P\xdb\xa2';
$pattern = '#\\\#';
$replacement = '\\\\\\';
$insert_value = preg_replace($pattern, $replacement, $string);
After which proceed to insert. You could use VARCHAR(256) for the column.
I'm positive there are a lot of better ways to go about this.
Apparently I'm on the python part of SO. I thought it was PHP. This is what I get for subscribing to multiple tags.

Illegal mixing of collation error utf8mb4 with peewee

I have a collation error with MySQL, specifically it is the following:
OperationalError: (1267, "Illegal mix of collations (utf8mb4_unicode_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '='")
After checking, I noticed that it is related to certain emojis, mostly smileys.
I've checked my MySQL database and it is by default using utf8mb4 charset as shown:
+------------+---------------------------------------------------------------------------------------------------+
| Database | Create Database |
+------------+---------------------------------------------------------------------------------------------------+
| Dictionary | CREATE DATABASE `Dictionary` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci */ |
+------------+---------------------------------------------------------------------------------------------------+
My MySQL settings also indicate that everything needed is set to utf8mb4:
+--------------------------+--------------------+
| Variable_name | Value |
+--------------------------+--------------------+
| character_set_client | utf8mb4 |
| character_set_connection | utf8mb4 |
| character_set_database | utf8mb4 |
| character_set_filesystem | binary |
| character_set_results | utf8mb4 |
| character_set_server | utf8mb4 |
| character_set_system | utf8 |
| collation_connection | utf8mb4_unicode_ci |
| collation_database | utf8mb4_unicode_ci |
| collation_server | utf8mb4_unicode_ci |
+--------------------------+--------------------+
I am using Peewee (the Python module) to make my queries and the following line is the one that is causing the collation error
SingleWords.get(SingleWords.word == lowercase)
It is not much of a problem for me if I can't insert certain emojis, but I would still like to if possible. I have no idea why this is happening, any thoughts?

try this
SELECT * COLLATE latin1_general_ci FROM table;
this will select all with collate latin1_general_ci

How to get the existing postgres databases in a list

I am trying to write a python script to automate the task of creating database using the most recent production dump. I am using psychopg2 for the purpose.
But after the creation of the new database I want to delete the previously used database. My idea is that if I could get the names of databases in a list and sort them, I can easily delete the unwanted database.
So, my question is : How can I get the names of the DBs in a list.
Thanks

You can list all of your DBs with
SELECT d.datname as "Name",
FROM pg_catalog.pg_database d
ORDER BY 1;
You can filter or order it whatever way you like.

psql -E -U postgres -c "\l"
The output of the above command is like
********* QUERY **********
SELECT d.datname as "Name",
pg_catalog.pg_get_userbyid(d.datdba) as "Owner",
pg_catalog.pg_encoding_to_char(d.encoding) as "Encoding",
d.datcollate as "Collate",
d.datctype as "Ctype",
pg_catalog.array_to_string(d.datacl, E'\n') AS "Access privileges"
FROM pg_catalog.pg_database d
ORDER BY 1;
**************************
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
--------------+----------+----------+---------+-------+-----------------------
mickey | postgres | UTF8 | C | C |
mickeylite | postgres | UTF8 | C | C |
postgres | postgres | UTF8 | C | C |
template0 | postgres | UTF8 | C | C | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | C | C | =c/postgres +
| | | | | postgres=CTc/postgres
(5 rows)