Question

如果我有以下字典：

foo = {'bar': {'baz': {'qux': 'gap'} } }

我希望用户能够输入＆＃34;＆＃39;＆＃39;＆＃39; baz＆＃39;＆＃39; qux＆＃39;＆＃39; dop＆＃39 ;＆＃34; [扩展：＆＃34; ＆＃39;杆＆＃39; ，＆＃39; baz＆＃39; ，＆＃39; qux＆＃39; ，＆＃39; dop＆＃39; ＆＃34;]转换：

{'qux': 'gap'}

到

{'qux': 'dop'}

我希望通过以下方式将用户输入转换为字典查找语句（不确定的确切术语）来解决这个问题：

objectPath = "foo"
objectPathList = commandList[:-1]  # commandList is the user input converted to a list

for i in objectPathList:
    objectPath += "[" + i + "]"

changeTo = commandList[-1]

上面的内容使objectPath =＆＃34; foo [＆＃39; bar＆＃39;] [＆＃39; baz＆＃39;] [＆＃39; qux＆＃39;]＆＃34;和changeTo =＆＃39; dop＆＃39;

大！但是，现在我遇到了将该语句转换为代码的问题。我认为eval（）可以做到这一点，但是以下似乎不起作用：

eval(objectPath) = changeTo

如何将字符串objectPath转换为替换硬编码？

Answer 1

我做这样的事情

foo = {'bar': {'baz': {'qux': 'gap'}}}
input = "'bar','baz','qux','dop'"

# Split the input into words and remove the quotes
words = [w.strip("'") for w in input.split(',')]

# Pop the last word (the new value) off of the list
new_val = words.pop()

# Get a reference to the inner dictionary ({'qux': 'gap'})
inner_dict = foo
for key in words[:-1]:
    inner_dict = inner_dict[key]

# assign the new value
inner_dict[words[-1]] = new_val

print("After:", foo)

Python：将字符串转换为代码

1 个答案: