Python函数参数作为全局变量 [英] Python function parameter as a global variable

问题描述

我编写了以下函数，它接受一个变量input_name.然后，用户输入一些分配给input_name的值.我想知道使input_name在函数外部可访问的最佳方法.我知道在函数内部将变量定义为全局变量意味着可以在函数外部使用它.但是，在这种情况下，变量实际上是函数的参数，因此我不确定如何将其定义为全局变量.感谢您的帮助，请在下面找到有问题的代码:

I have written the following function, it takes in a variable input_name. The user then inputs some value which is assigned to input_name. I want to know the best way to make input_name accessible outside of the function. I know that defining a variable as global, inside a function, means that is can be used outside of the function. However, in this case the variable as actually a parameter of the function so I am not sure how to define it as a global variable. I appreciate any help with this, please find the code in question below:

def input(input_name, prompt):
    while True:
        data = raw_input(prompt)
        if data:
            try:
                input_name = int(data)
            except ValueError:
                print 'Invalid input...'
            else:
                if input_name >= 0 and input_name < 100:
                    print 'Congratulations'
                    break
                input_name = 'Please try again: '
        else:
            print 'Goodbye!'
            break

month = 0
day = 0
year = 0
century = 0

input(month, "Please enter the month (from 1-12, where March is 1 and February is 12): ")
input(day, "Please enter the day (from 1-31): ")
input(year, "Please enter the year (from 0 - 99, eg. 88 in 1988): ")
input(century, "Please enter the century (from 0 - 99, eg. 19 in 1988): ")

A = month
B = day
C = year
D = century

推荐答案

最简单的方法是返回值，并将其分配给函数之外:

The simplest thing would be to return the value, and assign it outside the function:

def my_input(prompt):
    #.. blah blah..
    return the_value

month = my_input("Please enter the month")
# etc.

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