2/19/2021

TeamViewer, can't access remote computer on ubuntu after a reboot

It works for me.

 

sudo gedit /etc/gdm3/custom.conf

Uncomment this line in custom.conf file:

WaylandEnable=false

and Reboot.


1/29/2021

Importerror: libgl.so.1: cannot open shared object file: no such file or directory opencv error

Try this one first:

pip install opencv-python--headless


or 

install follow in case centos or aws linux docker

RUN yum install whatprovides libGL.so.1 -y

install follow in case linux docker

ENV TZ=Europe/Minsk
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
RUN apt-get install libgtk2.0-dev -y

 

Thank you, Good luck!

1/26/2021

AWS dynamoDB, search item by condition in 3 ways

 

Most secure way is 3rd, first and second way can fail when items are many.


code start

#pre define
UID_common = '24dea8d41ef74efda24a4b37805fe6de'

#### way 1 ###
dynamodb_resource = boto3.resource('dynamodb')
docs_table = dynamodb_resource.Table(DOCUMENTS_TABLE_NAME)
resp = docs_table.scan(FilterExpression = Attr('UID_COMMON').eq(UID_common))
for item in resp['Items']:
print( item['UID'] )

#### pre-define ###
dynamo_client = boto3.client('dynamodb',
aws_access_key_id = ACCESS_KEY,
aws_secret_access_key = SECRET_KEY,
region_name = REGION
)

#### way 2 ###
response = dynamo_client.scan(
TableName = DOCUMENTS_TABLE_NAME,
ExpressionAttributeValues={':search':{'S': UID_common} },
FilterExpression = "UID_COMMON = :search"
)
for item in response['Items']:
print(item['UID']['S'] )

### way 3 ###
paginator = dynamo_client.get_paginator('scan')
operation_parameters = {
'TableName': DOCUMENTS_TABLE_NAME,
'FilterExpression': 'UID_COMMON = :search',
'ExpressionAttributeValues': {
':search': {'S': UID_common},
}
}

page_iterator = paginator.paginate(**operation_parameters)
for page in page_iterator:
for item in page['Items']:
print( item['UID']['S'] )

code end


Enjoy AWS!