这是 Flask app.py
from flask import Flask, redirect, url_for, request
import trainer
app = Flask(__name__)
@app.route('/success/<name>')
def success(name):
gValue = trainer.myFunction()
name = name + gValue
return 'welcome %s' % name
@app.route('/login', methods=['POST', 'GET'])
def login():
if request.method == 'POST':
user = request.form['nm']
return redirect(url_for('success', name=user))
else:
user = request.args.get('nm')
return redirect(url_for('success', name=user))
if __name__ == '__main__':
app.run(debug=True, threaded=True, use_reloader=False)
HTML 文件
<html>
<body>
<form action = "http://localhost:5000/login" method = "post">
<p>Enter Name:</p>
<p><input type = "text" name = "nm" /></p>
<p><input type = "submit" value = "submit" /></p>
</form>
</body>
</html>
培训师.py
from utils import sumValue
def myFunction():
pullValue = sumValue()
return pullValue
utils.py
aggregateValue = " defaultValue"
def sumValue():
global aggregateValue
x = " mainValue"
x1 = x + aggregateValue
aggregateValue = " modifiedValue"
x2 = x1 + aggregateValue
print(x2)
return x2
运行应用程序
C:\test>python app.py
* Serving Flask app 'app'
* Debug mode: on
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
* Running on http://127.0.0.1:5000
Press CTRL+C to quit
127.0.0.1 - - [09/Jan/2024 16:12:57] "POST /login HTTP/1.1" 302 -
mainValue defaultValue modifiedValue
127.0.0.1 - - [09/Jan/2024 16:12:57] "GET /success/Value HTTP/1.1" 200 -
127.0.0.1 - - [09/Jan/2024 16:15:59] "POST /login HTTP/1.1" 302 -
mainValue modifiedValue modifiedValue
127.0.0.1 - - [09/Jan/2024 16:15:59] "GET /success/Value HTTP/1.1" 200 -
在第一次运行中我们得到
主值默认值修改值
第二轮
主值修改值修改值
由于第二次运行是全新运行，我希望中间值应该是defaultValue而不是modifiedValue，
utils.py 中的全局声明在第二次运行期间未初始化，
如果我们按Ctrl+C并重新开始，内存将被清除以获取defaultValue
我可以知道如何在这里初始化全局变量吗？
从我在您的代码中看到的，您可以添加一行来重置变量，您可以在完成 sumValue() 函数之前执行此操作。
aggregateValue = " defaultValue"
def sumValue():
global aggregateValue
x = " mainValue"
x1 = x + aggregateValue
aggregateValue = " modifiedValue"
# Print the variable [MOD]
print("===> " + aggregateValue)
x2 = x1 + aggregateValue
print(x2)
aggregateValue = " defaultValue"
# Print the variable [RESET]
print("$$$$> " + aggregateValue)
return x2