HTML templating using Jinja2 – Lost
Question:
I am trying to create a html template in python using Jinja2. I have a templates folder with my ‘template.html’ but I don’t know how to deal with environments or package loaders.
I installed Jinja2 using easy_python and ran the following script.
from jinja2 import Environment, PackageLoader
env = Environment(loader=PackageLoader('yourapplication', 'templates'))
template = env.get_template('mytemplate.html')
print template.render()
I get the following error because I don’t know how to define a package/module. Please help me I just want to create a simple template.
File "log_manipulationLL.py", line 291, in <module>
env = Environment(loader=PackageLoader('yourapplication', 'templates'))
File "/usr/local/lib/python2.7/dist-packages/Jinja2-2.6-py2.7.egg/jinja2/loaders.py", line 216, in __init__
provider = get_provider(package_name)
File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 213, in get_provider
__import__(moduleOrReq)
ImportError: No module named yourapplication
Answers:
PackageLoader
expects an actual Python module using the regular dot syntax. For example if your structure looks like this:
myapp/
__init__.py
…
templates/
mytemplate.html
You should use myapp
as the module name.
I solved this problem using the following code:
env = Environment(loader=PackageLoader('scriptname',
templatesPath))
where this code is into the file scriptname.py
.
I am not sure if my answer is relevant but I was wondering that perhaps someone may find this answer useful. If I am wrong please let me know.
If you don’t want or need a Python package, you probably should use a FileSystemLoader instead, like this:
from jinja2 import Environment, FileSystemLoader, select_autoescape
env = Environment(
loader=FileSystemLoader('file/path/'),
autoescape=select_autoescape(['html', 'xml']),
)
PackageLoader is defined like this:
class PackageLoader(BaseLoader):
"""Load templates from python eggs or packages. It is constructed with
the name of the python package and the path to the templates in that
package::
loader = PackageLoader('mypackage', 'views')
If the package path is not given, ``'templates'`` is assumed.
Per default the template encoding is ``'utf-8'`` which can be changed
by setting the `encoding` parameter to something else. Due to the nature
of eggs it's only possible to reload templates if the package was loaded
from the file system and not a zip file.
"""
And then the __init__()
method is as follows:
def __init__(self, package_name, package_path='templates',
encoding='utf-8'):
This makes us notice that a structure like this:
myapp/
__init__.py
...
templates/
mytemplate.html
Will have the same PackageLoader
instance with both of these declarations:
PackageLoader('myapp')
PackageLoader('myapp', 'templates')
And so if you are running from the myapp/
path, you then just need to say:
PackageLoader('templates', '')
So that it will just take templates/
as the path. If you leave the 2nd argument empty, it will try to find the templates in templates/templates
.
Finally, you can check what has been loaded by using the list_templates()
method:
PackageLoader('templates', '').list_templates()
I had multiple templates and jinja2 documentation is not well documented. You can actually use the FileSystemLoader from jinja2
from jinja2 import Environment, FileSystemLoader
# Declare the environment
templateLoader = FileSystemLoader(searchpath="./templates")
env = Environment(loader=templateLoader)
# Generate the HTML template base on the template name
template = env.get_template(f'{template}.html')
# And then use it to render your templates
html = template.render( ) # Your args goes here
Credits: This Answer
I am trying to create a html template in python using Jinja2. I have a templates folder with my ‘template.html’ but I don’t know how to deal with environments or package loaders.
I installed Jinja2 using easy_python and ran the following script.
from jinja2 import Environment, PackageLoader
env = Environment(loader=PackageLoader('yourapplication', 'templates'))
template = env.get_template('mytemplate.html')
print template.render()
I get the following error because I don’t know how to define a package/module. Please help me I just want to create a simple template.
File "log_manipulationLL.py", line 291, in <module>
env = Environment(loader=PackageLoader('yourapplication', 'templates'))
File "/usr/local/lib/python2.7/dist-packages/Jinja2-2.6-py2.7.egg/jinja2/loaders.py", line 216, in __init__
provider = get_provider(package_name)
File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 213, in get_provider
__import__(moduleOrReq)
ImportError: No module named yourapplication
PackageLoader
expects an actual Python module using the regular dot syntax. For example if your structure looks like this:
myapp/
__init__.py
…
templates/
mytemplate.html
You should use myapp
as the module name.
I solved this problem using the following code:
env = Environment(loader=PackageLoader('scriptname',
templatesPath))
where this code is into the file scriptname.py
.
I am not sure if my answer is relevant but I was wondering that perhaps someone may find this answer useful. If I am wrong please let me know.
If you don’t want or need a Python package, you probably should use a FileSystemLoader instead, like this:
from jinja2 import Environment, FileSystemLoader, select_autoescape
env = Environment(
loader=FileSystemLoader('file/path/'),
autoescape=select_autoescape(['html', 'xml']),
)
PackageLoader is defined like this:
class PackageLoader(BaseLoader):
"""Load templates from python eggs or packages. It is constructed with
the name of the python package and the path to the templates in that
package::
loader = PackageLoader('mypackage', 'views')
If the package path is not given, ``'templates'`` is assumed.
Per default the template encoding is ``'utf-8'`` which can be changed
by setting the `encoding` parameter to something else. Due to the nature
of eggs it's only possible to reload templates if the package was loaded
from the file system and not a zip file.
"""
And then the __init__()
method is as follows:
def __init__(self, package_name, package_path='templates',
encoding='utf-8'):
This makes us notice that a structure like this:
myapp/
__init__.py
...
templates/
mytemplate.html
Will have the same PackageLoader
instance with both of these declarations:
PackageLoader('myapp')
PackageLoader('myapp', 'templates')
And so if you are running from the myapp/
path, you then just need to say:
PackageLoader('templates', '')
So that it will just take templates/
as the path. If you leave the 2nd argument empty, it will try to find the templates in templates/templates
.
Finally, you can check what has been loaded by using the list_templates()
method:
PackageLoader('templates', '').list_templates()
I had multiple templates and jinja2 documentation is not well documented. You can actually use the FileSystemLoader from jinja2
from jinja2 import Environment, FileSystemLoader
# Declare the environment
templateLoader = FileSystemLoader(searchpath="./templates")
env = Environment(loader=templateLoader)
# Generate the HTML template base on the template name
template = env.get_template(f'{template}.html')
# And then use it to render your templates
html = template.render( ) # Your args goes here
Credits: This Answer