Monthly Archives: June 2018

How to read an image from url in python 3 and get the height and width

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To read an image directly from url and then reads its size. you can use urllib.request and PIL aka Pillow.
If you don’t have pillow installed. you can use:

python -m pip install Pillow

and before that you might need to upgrade pip, especially if you get an error

python -m pip install --upgrade pip

Here is how to read an image from url.

import urllib.request from PIL import Image url = 'http://www.example.com/my_image_is_not_your_image.png' image = Image.open(urllib.request.urlopen(url)) width, height = image.size print (width,height)

If you followed a tutorial that uses urllib2 you can change that to urllib.request in python 3.

‘cp932’ codec can’t encode character ‘\xa1’ in position 62: illegal multibyte sequence

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When using print in python with some multibyte character or when decoding from another encoding you might encounter this fatal error:

Traceback (most recent call last): File "skynet.py", line 28, in print(skyname_wakeup_word) UnicodeEncodeError: 'cp932' codec can't encode character '\xa1' in position 62: illegal multibyte sequence

To sort of fix it, you can use

skyname_wakeup_word.encode('cp932',"ignore")

This occurs because python can’t convert that character to the traditional windows ansi used in windows terminal (cmd). cp932 is code page 932 the Japanese version of shift-JIS.
Other encodings: cp874, cp936, cp949, cp950, cp1251, cp1252, cp1253, cp1254, cp1255, cp1256, cp1257, cp1258. Source

How to test nginx configuration without breaking down the server

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You simply use t and c flags followed by config file

sudo nginx -tc /etc/nginx/nginx.conf

This can give you output like this when ok:

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

t flag according to man nginx means : Do not run, just test the configuration file. nginx checks the configuration file syntax and then tries to open files referenced in the configuration file.

c flag means: Use an alternative configuration file. the config file path should come after the c flag.

Why you should use this instead of restart? or reload? because when you do sudo service nginx restart and your config file is broken you’ll affect the whole server and if you have multiple websites that means all sites go down possibly because of some little curly boi ; . reload might not do anything when there is error. to be safe always test config before reloading or restarting. even if you do simple changes to main nginx config or sites configs.