Why Does Flask Throw a 'TemplateNotFound' Error Even Though My Template File Exists?

Flask TemplateNotFound Error Despite Existing Template File

In an attempt to render the home.html template, developers often encounter the error "jinja2.exceptions.TemplateNotFound: home.html." This error arises when Flask struggles to locate the specified template file.

Understanding Template File Location

The key to resolving this error lies in ensuring that template files are placed in the appropriate location. By default, Flask searches for templates in a subdirectory named templates, which must be adjacent to the Python module where the Flask app is created.

Correct File Structure

The project's file structure should resemble the following:

/myproject
    app.py
    templates/
        home.html

Alternatively, if the templates folder has been renamed, Flask can be notified using the template_folder parameter:

app = Flask(__name__, template_folder='template')

Blueprint Templates

Blueprints in Flask also support custom template directories. However, these directories are searched after the main app's template directory.

Troubleshooting Options

• Correct File Location: Confirm that the template file is present in the expected templates subdirectory.
• Folder Naming: Ensure that the templates folder is named templates, unless explicitly specified using template_folder.
• Debugging Template Loading: Set the EXPLAIN_TEMPLATE_LOADING option to True to obtain a detailed log of Flask's template search process. This can help identify any unexpected behavior.

The above is the detailed content of Why Does Flask Throw a 'TemplateNotFound' Error Even Though My Template File Exists?. For more information, please follow other related articles on the PHP Chinese website!