Flask Blueprint初始化报错：意外关键字参数'template_folder'

项目目录结构 #

p/
   student/
      template/
          student/
              index.html
      views.py
   __init__.py
app.py

各文件内容 #

app.py #

from flask import Flask, render_template
from p import app

@app.route("/")
def index():
    return render_template("index.html")
if __name__ == "__main__":
    app.run()

p/init.py #

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate

app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = "postgresql://postgres:1234@localhost/studentRegDB"
app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False

db = SQLAlchemy(app)
Migrate(app, db)

from p.student.views import student_blueprints
app.register_blueprint(student_blueprints, url_prefix='/student')

p/student/views.py #

from flask import Flask, request
import psycopg2
from p import db
from p.student.forms import studentform
from p.student.models import Student
from flask import render_template, url_for,redirect
from flask_blueprint import Blueprint  # 错误导入
student_blueprints = Blueprint('student', __name__, template_folder='student')

@student_blueprints.route("/add", methods=["GET", "POST"])
def addstudent():
    form = studentform()
    if form.validate_on_submit():
        name = request.form['name']
        course = request.form['course']
        new_student = Student(name,course)
        db.session.add(new_student)
        db.session.commit()
        return redirect(url_for("success.html"))
    return render_template("student.html", form=form)

报错信息 #

student_blueprints = Blueprint('student', __name__, template_folder='student')
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: Blueprint.__init__() got an unexpected keyword argument 'template_folder'

解决方法 #

1. 修正Blueprint的导入语句 #

你错误地从第三方包flask_blueprint导入了Blueprint，而Flask原生的Blueprint组件是内置在flask模块中的。把views.py里的导入语句改成：

from flask import Blueprint

2. 调整template_folder路径（适配目录结构） #

根据你的目录结构，模板文件存放在p/student/template/student/下，所以Blueprint的template_folder应该指向template目录，确保Flask能正确找到模板：

student_blueprints = Blueprint('student', __name__, template_folder='template')

之后调用render_template时，可直接写对应模板的路径，比如render_template("student/index.html")。

3. 修正redirect的url_for用法 #

代码里redirect(url_for("success.html"))是错误的，url_for需要传入视图函数名而非模板文件名。如果有一个名为success的视图函数，应写成redirect(url_for("student.success"))（若success属于student蓝图），或者直接用redirect("/success")。

内容的提问来源于stack exchange，提问作者mkg