from flask import Flask, render_template
app = Flask(__name__)
@app.route('/control')
def control_statement():
age = 19
books = [{
'name': '三国演义',
'author': '罗贯中'
}, {
'name': '水浒传',
'author': '施耐庵'
}]
return render_template('control.html', age=age, books=books)
if __name__ == '__main__':
app.run()在 templates 中创建 control.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>控制语句demo</title>
</head>
<body>
{% if age>18 %}
<div>你已经满18岁</div>
{% elif age == 18 %}
<div>你刚满18岁</div>
{% else %}
<div>你未满18岁</div>
{% endif %} <!-- Jinja2中使用if开头，就一定要用endif做结尾 -->
{% for book in books %}
<div>图书名称：{{ book.name }}，图书作者：{{ book.author }}</div>
{% endfor %} <!-- Jinja2中使用for开头，就一定要用endfor做结尾 -->
</body>
</html>
