jinja2.exceptions.TemplateNotFound: Ejemplo de código de plantilla.html

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Ejemplo 1: jinja2.exceptions.templatenotfound: templates/index.html

app = Flask(__name__, template_folder=path of template directory)

Ejemplo 2: jinja2.excepciones.templatenotfound: base.html

You must create your template files in the correct location; in the templates subdirectory next to the python module (== the module where you create your Flask app).

The error indicates that there is no home.html file in the templates/ directory. Make sure you created that directory in the same directory as your python module, and that you did in fact put a home.html file in that subdirectory. If your app is a package, the templates folder should be created inside the package.

myproject/
    app.py
    templates/
        home.html
myproject/
    mypackage/
        __init__.py
        templates/
            home.html
Alternatively, if you named your templates folder something other than templates and don't want to rename it to the default, you can tell Flask to use that other directory.

app = Flask(__name__, template_folder='template')  # still relative to module
You can ask Flask to explain how it tried to find a given template, by setting the EXPLAIN_TEMPLATE_LOADING option to True. For every template loaded, you'll get a report logged to the Flask app.logger, at level INFO.

This is what it looks like when a search is successful; in this example the foo/bar.html template extends the base.html template, so there are two searches:

[2019-06-15 16:03:39,197] INFO in debughelpers: Locating template "foo/bar.html":
    1: trying loader of application "flaskpackagename"
       class: jinja2.loaders.FileSystemLoader
       encoding: 'utf-8'
       followlinks: False
       searchpath:
         - /.../project/flaskpackagename/templates
       -> found ('/.../project/flaskpackagename/templates/foo/bar.html')
[2019-06-15 16:03:39,203] INFO in debughelpers: Locating template "base.html":
    1: trying loader of application "flaskpackagename"
       class: jinja2.loaders.FileSystemLoader
       encoding: 'utf-8'
       followlinks: False
       searchpath:
         - /.../project/flaskpackagename/templates
       -> found ('/.../project/flaskpackagename/templates/base.html')
Blueprints can register their own template directories too, but this is not a requirement if you are using blueprints to make it easier to split a larger project across logical units. The main Flask app template directory is always searched first even when using additional paths per blueprint.

Ejemplo 3: jinja2.exceptions.templatenotfound: templates/index.html

from flask import Flask, render_template
app = Flask(__name__)
@app.route("/profile/")
def profile(name):
    return render_template('profile.html', name=name)
if __name__ == "__main__":
    app.run(debug=True)

Acuérdate de que tienes permiso de agregar una reseña si te fue de ayuda.

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