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Are global variables thread-safe in Flask? How do I share data between requests? (4 answers)

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The hello world demo for Flask is:

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello World!"

if __name__ == "__main__":
    app.run()

如果我这样作的话:

from flask import Flask
app = Flask(__name__)

a = 1
b = 2
c = 3

@app.route("/")
def hello():
    a += 1
    b += a
    c += b
    return "Hello World!"

if __name__ == "__main__":
    app.run()

我理解,世界农业研究组织的申请可能会有多个线索。 <代码>hello功能可以同时在多个侧面上运行,然后我们有种族条件。这是否正确? 如果上述法典不安全,我能做些什么来使之安全?

避免全球化是一种可能的解决办法,但你能否永远避免全球化? 如果我想要像一个 object客这样的东西,那么什么呢?

Answer 1

You could try the Local class from werkzeug. Here s some info about it: Context Locals

例:

from flask import Flask
from werkzeug.local import Local
app = Flask(__name__)
loc = Local()
loc.a = 1
loc.b = 2
loc.c = 3

@app.route("/")
def hello():
    loc.a += 1
    loc.b += loc.a
    loc.c += loc.b
    return "Hello World!"

if __name__ == "__main__":
    app.run()

Answer 2

您可以看<代码>g, 您可以直接从薄膜进口的物体,为这一请求在全球保留物体。如果你重新使用由世界农业研究组织驱动的活动服务器(tornado,gevent,等),那么你就应该有问题。

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