使用包含的变量重新格式化字符串

Question

我有一个充满变量的库（我不想手动编辑），它看起来像这样：

def get_variables(gateway):
    variables={
        'gateway':gateway, 
        'license_test_data':gateway['license_data'],
        'license_for_application':gateway['license_for_application'],
        'Valid_Login_Test_Vairables':{'valid_ssh_command':['ssh '+gateway['DeviceUnderTestUserid']+'@'+gateway['DeviceUnderTestIP'],'password:']}
        #around 3000 more just like this or worse
       }
return variables

我需要将此信息导入 python 数据结构而不替换“网关”变量。换句话说，我希望能够：

print vars['Valid_Login_Test_Vairables']['valid_ssh_command']

得到这个

'ssh +gateway['DeviceUnderTestUserid']+'@'+gateway['DeviceUnderTestIP'],'password:']

相反，我最终得到了这个：

print vars['Valid_Login_Test_Vairables']['valid_ssh_command']

"ssh gateway['DeviceUnderTestUserid']@gateway['DeviceUnderTestIP']", 'password:'

我一直在尝试的是：

import varfile
import dummy.gateway
vars=varfile.get_variables(dummy.gateway)

我的 dummy.gateway 看起来像这样：

gateway['license_test_data'] = "gateway['license_test_data']"
gateway['license_for_application'] = "gateway['license_for_application']"
gateway['license_for_setup'] = "gateway['license_for_setup']"

如何将变量文件的确切内容转换为有用的数据结构？

Answer 1

我发现你的问题有点难以理解，但如果我能正确地做到这一点，下面会从你所拥有的东西中产生你所说的你想要的东西。

# used as a stand-in for your 'import dummy.gateway'
dummy_gateway = {}
dummy_gateway['license_test_data'] = "gateway['license_test_data']"
dummy_gateway['license_for_application'] = "gateway['license_for_application']"
dummy_gateway['license_for_setup'] = "gateway['license_for_setup']"
dummy_gateway['DeviceUnderTestUserid'] = "gateway['DeviceUnderTestUserid']"
dummy_gateway['DeviceUnderTestIP'] = "gateway['DeviceUnderTestIP']"

# your example code corrected and reformatted to be slightly more readable
def get_variables(gateway):
    variables={
        'gateway':gateway,
        'license_test_data':gateway['license_test_data'],
        'license_for_application':gateway['license_for_application'],
        'Valid_Login_Test_Vairables':{
            'valid_ssh_command':
                ['ssh '+gateway['DeviceUnderTestUserid']+'@'+
                    gateway['DeviceUnderTestIP'],
                 'password:']
            }
        #around 3000 more just like this or worse
       }
    return variables

vars = get_variables(dummy_gateway)
print vars['Valid_Login_Test_Vairables']['valid_ssh_command']

结果，即由两个字符串组成的list：

["ssh gateway['DeviceUnderTestUserid']@gateway['DeviceUnderTestIP']",'password:']

希望这会有所帮助。

附：顺便说一句，vars 的名称与标准库中 built-in Python function 的名称冲突，因此即使在这种情况下，将其用作变量之一的名称通常也被认为是一种不好的编程习惯，就目前而言顺其自然。