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Get lengths of a list in a jinja2 template
... You could use none build-in function to test for None. Check more here: https://jinja.palletsprojects.com/en/2.10.x/templates/#none. Example is on this thread: https://stackoverflow.com/questions/19614027/jinja2-template-variable-if-none-object-set-a-default-value
– Wojciech...
How to detect Safari, Chrome, IE, Firefox and Opera browser?
...ctions to install an extension. Use feature detection when possible.
Demo: https://jsfiddle.net/6spj1059/
// Opera 8.0+
var isOpera = (!!window.opr && !!opr.addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
// Firefox 1.0+
var isFirefox = typeof InstallTrigger !...
Error:(1, 0) Plugin with id 'com.android.application' not found
... repositories {
google() // For Gradle 4.0+
maven { url 'https://maven.google.com' } // For Gradle < 4.0
}
dependencies {
classpath 'com.android.tools.build:gradle:3.6.2'
}
}
Read more here: https://developer.android.com/studio/build/index.html and about ve...
Get local href value from anchor (a) tag
...test a").on('click', function(e) {
console.log(e.target.hash); // logs https://www.test./com/#test
console.log(e.target.href); // logs #test
});
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Using IPython notebooks under version control
...3.0, which persists to markdown files rather than json-based ipymd files:
https://github.com/rossant/ipymd
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Python equivalent of D3.js
...dated more recently. Though the examples are all static D3.
more info:
https://github.com/wrobstory/vincent
https://pypi.python.org/pypi/vincent/0.1.6
The graphs can be viewed in Ipython, just add this code
vincent.core.initialize_notebook()
Or output to JSON where you can view the JSON o...
How to put comments in Django templates
...
Comment tags are documented at https://docs.djangoproject.com/en/stable/ref/templates/builtins/#std:templatetag-comment
{% comment %} this is a comment {% endcomment %}
Single line comments are documented at https://docs.djangoproject.com/en/stable/to...
Git submodule add: “a git directory is found locally” issue
...e:
[submodule "path_to_submodule"]
path = path_to_submodule
url = https://github.com/path_to_submodule
Delete the relevant section from .git/config. e.g. delete these:
[submodule "path_to_submodule"]
url = https://github.com/path_to_submodule
rm -rf .git/modules/path_to_submodule
The...
Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12
...y, for any instance barring special circumstances). For more on that see
https://stackoverflow.com/a/3630707/141172
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How to pass a user defined argument in scrapy spider
...ot break.
class MySpider(Spider):
name="myspider"
start_urls = ('https://httpbin.org/ip',)
def parse(self,response):
print getattr(self,'category','')
print getattr(self,'domain','')
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