如何在__main__中创建一个变量，以供同一文件中定义的web.py类使用？

我使用来自web.py的内置Web服务器，而不是像这个问题那样使用apache：Apache中web.py的全局变量用法

我有一个使用数字作为参数的Web服务，将其添加到内部变量中number并返回该变量。

脚本如下所示：

import web
import sys

urls = (
    '/(\d+)', 'Number'
)

class Number:
    def GET(self, parameter):
        # I want to read and write to the variable number here

        print "number in web service is " + str(number)

        number = number + int(parameter)
        return number


if __name__ == "__main__":
    #print sys.argv

    # I want to initialise the variable number here, based on command line parameter

    number = int(sys.argv[2]) if len(sys.argv) >= 3 else 0 # initialisation

    print "number init value " + str(number)

    app = web.application(urls, globals())
    app.run()

我像这样启动服务器：

sudo python test.py 192.168.0.100 16

16内部计数器的初始值在哪里。

当这样执行时：

http://192.168.0.100:8080/42

我UnboundLocalError: local variable 'number' referenced before assignment在这条线上

print "number in web service is " + str(number)

好的，所以我需要global，因为我不想number成为服务的局部变量，所以我更改为：

import web
import sys

urls = (
    '/(\d+)', 'Number'
)

class Number:
    def GET(self, parameter):
        # I want to read and write to the variable number here

        global number # number is not a lcoal variable

        print "number in web service is " + str(number)

        number = number + int(parameter)
        return number


if __name__ == "__main__":
    #print sys.argv

    # I want to initialise the variable number here, based on command line parameter

    number = int(sys.argv[2]) if len(sys.argv) >= 3 else 0 # initialisation

    print "number init value " + str(number)

    app = web.application(urls, globals())
    app.run()

现在，在同一行上调用服务时出现另一个错误NameError: global name 'number' is not defined。为了解决这个问题，我在顶部添加了一个初始化：

import web
import sys

urls = (
    '/(\d+)', 'Number'
)

number = 0 # assigning value to define variable

class Number:
    def GET(self, parameter):
        # I want to read and write to the variable number here

        global number # number is not a lcoal variable

        print "number in web service is " + str(number)

        number = number + int(parameter)
        return number


if __name__ == "__main__":
    #print sys.argv

    # I want to initialise the variable number here, based on command line parameter

    number = int(sys.argv[2]) if len(sys.argv) >= 3 else 0 # initialisation

    print "number init value " + str(number)

    app = web.application(urls, globals())
    app.run()

虽然我现在没有收到错误，但逻辑已损坏。number init value is 16它说，当初始打印显示该值时，其他打印没有相同的值number in web service is 0。

显然，number我的代码中有两个单独的变量。我发现这个答案指出这__main__是一个单独的模块。现在说明的不同值number。但是，当我尝试添加global到时__main__，如下所示：

import web
import sys

urls = (
    '/(\d+)', 'Number'
)

number = 0 # assigning value to define variable

class Number:
    def GET(self, parameter):
        # I want to read and write to the variable number here

        global number # number is not a lcoal variable

        print "number in web service is " + str(number)

        number = number + int(parameter)
        return number


if __name__ == "__main__":
    #print sys.argv

    # I want to initialise the variable number here, based on command line parameter

    global number # I want that one global variable number
    number = int(sys.argv[2]) if len(sys.argv) >= 3 else 0 # initialisation

    print "number init value " + str(number)

    app = web.application(urls, globals())
    app.run()

该值在初始化时再次为16，在服务中再次为0。我SyntaxWarning: name 'number' is assigned to before global declaration在那条新线上__main__

因此，我再次摆脱了顶部的任务，这实际上并没有必要。因为真正的初始化发生在__main__：

import web
import sys

urls = (
    '/(\d+)', 'Number'
)

class Number:
    def GET(self, parameter):
        # I want to read and write to the variable number here

        global number # number is not a lcoal variable

        print "number in web service is " + str(number)

        number = number + int(parameter)
        return number


if __name__ == "__main__":
    #print sys.argv

    # I want to initialise the variable number here, based on command line parameter

    global number # I want that one global variable number
    number = int(sys.argv[2]) if len(sys.argv) >= 3 else 0 # initialisation

    print "number init value " + str(number)

    app = web.application(urls, globals())
    app.run()

虽然最初执行时没有警告，但确实NameError global name 'number' is not defined从GET方法中获得了a 。

如何创建一个可以设置的变量，__main__并且还可以从同一文件中定义的类的方法读取和写入该变量？