Question

我已接近我的最终目标，即在模块和其他导入的模块之间生成一个漂亮的图形。

例如，如果x从y和z导入，y从t和v导入，我希望：

x -> y, z
y -> t, v

现在我已经将导入钩子定义如下，但是在一个简单的文件上运行它我得不到我期望的结果：

python study_imports.py CollectImports simple.py

('study_imports.py', 'study_imports')

simple.py实际上是从study_imports导入的。问题是我想看“simple.py”而不是“study_imports.py”，有没有办法让文件的路径实际导入其他模块？

class CollectImports(object):
    """
    Import hook, adds each import request to the loaded set and dumps
    them to file
    """

    def __init__(self, output_file):
        self.loaded = set()
        self.output_file = output_file

    def __str__(self):
        return str(self.loaded)

    def cleanup(self):
        """Dump the loaded set to file
        """
        dumped_str = '\n'.join(x for x in self.loaded)
        open(self.output_file, 'w').write(dumped_str)

    def find_module(self, module_name, package=None):
        #TODO: try to find the name of the package which is actually
        #importing something else, and how it's doing it
        #use a defualtdict with empty sets as the storage for this job
        entry = (__file__, module_name)
        self.loaded.add(str(entry))

Answer 1

可能使用inspect模块。

模块a.py

import inspect

print inspect.stack()

模块b.py

import a

运行b.py时，我得到了：

[
   (<frame object at 0x28a9b70>, '/path/a.py', 5, '<module>', ['print inspect.stack()\n'], 0),
   (<frame object at 0x28a9660>, 'b.py', 2, '<module>', ['import to_import\n'], 0)
]

看起来第二帧包含您需要的内容。

Answer 2

所以我更好地看了一下snakefood，最后我用AST重写了我的代码。 Snakefood仍然使用编译器，它被弃用并且比使用ast慢得多。

结果很棒，例如这是访问者：

from ast import parse, NodeVisitor


class ImportVisitor(NodeVisitor):

    def __init__(self):
        self.imported = set()
        super(ImportVisitor, self).__init__()

    def __str__(self):
        return '\n'.join(x for x in self.imported)

    def visit_Import(self, node):
        for n in node.names:
            self.imported.add(n.name)

    #that we are using
    def visit_ImportFrom(self, node):
        self.imported.add(node.module)

可以使用例如：

def gen_module_imports(mod):
    try:
        at = parse(open(mod).read())
    except SyntaxError:
        print("file %s has a syntax error, please fix it" % mod)
        return []
    else:
        v = ImportVisitor()
        v.visit(at)
        return v.imported

Answer 3

检查技巧似乎工作得很好:) 我在imports.log中得到了类似simple.py：set（['study_imports']）的内容。

Class CollectImports(object):
    """
    Import hook, adds each import request to the loaded set and dumps
    them to file
    """

    def __init__(self, output_file):
        self.loaded = defaultdict(lambda: set())
        self.output_file = output_file

    def __str__(self):
        return str(self.loaded)

    def cleanup(self):
        """Dump the loaded set to file
        """
        dumped_str = '\n'.join(('%s: %s' % (k, v)) for k, v in self.loaded.items())
        open(self.output_file, 'w').write(dumped_str)

    def find_module(self, module_name, package=None):
        st = inspect.stack()
        self.loaded[st[1][1]].add(module_name)

生成导入图

3 个答案: