[英]Get package root and full module name from .py file for importing
我正在尋找一種簡單快速的方法來查找包的根目錄和從.py文件的路徑中找到完整的模塊名稱。
我希望用戶選擇.py並導入它而不會中斷。 導入模塊如果它是包的一部分可能會中斷。 因此,我想自動將包的根所在的目錄附加到sys.path(如果尚未存在),然后導入模塊及其完整的模塊名稱。
我沒有從同一目錄或該腳本運行任何地方,所以我不能使用__file__
這樣的事情。 此外我還沒有導入模塊,所以我不能(據我所知)檢查模塊對象,因為沒有。
這是一個工作版本,但我有興趣找到更容易/更快的解決方案。
def splitPathFull(path):
folders=[]
while 1:
path,folder=os.path.split(path)
if folder!="":
folders.append(folder)
else:
if path!="":
folders.append(path)
break
folders.reverse()
return folders
def getPackageRootAndModuleNameFromFilePath(filePath):
"""
It recursively looks up until it finds a folder without __init__.py and uses that as the root of the package
the root of the package.
"""
folder = os.path.dirname(filePath)
if not os.path.exists( folder ):
raise RuntimeError( "Location does not exist: {0}".format(folder) )
if not filePath.endswith(".py"):
return None
moduleName = os.path.splitext( os.path.basename(filePath) )[0] # filename without extension
#
# If there's a __init__.py in the folder:
# Find the root module folder by recursively going up until there's no more __init__.py
# Else:
# It's a standalone module/python script.
#
foundScriptRoot = False
fullModuleName = None
rootPackagePath = None
if not os.path.exists( os.path.join(folder, "__init__.py" ) ):
rootPackagePath = folder
fullModuleName = moduleName
foundScriptRoot = True
# It's not in a Python package but a seperate ".py" script
# Thus append it's directory name to sys path (if not in there) and import the .py as a module
else:
startFolder = folder
moduleList = []
if moduleName != "__init__":
moduleList.append(moduleName)
amountUp = 0
while os.path.exists( folder ) and foundScriptRoot == False:
moduleList.append ( os.path.basename(folder) )
folder = os.path.dirname(folder)
amountUp += 1
if not os.path.exists( os.path.join(folder, "__init__.py" ) ):
foundScriptRoot = True
splitPath = splitPathFull(startFolder)
rootPackagePath = os.path.join( *splitPath[:-amountUp] )
moduleList.reverse()
fullModuleName = ".".join(moduleList)
if fullModuleName == None or rootPackagePath == None or foundScriptRoot == False:
raise RuntimeError( "Couldn't resolve python package root python path and full module name for: {0}".format(filePath) )
return [rootPackagePath, fullModuleName]
def importModuleFromFilepath(filePath, reloadModule=True):
"""
Imports a module by it's filePath.
It adds the root folder to sys.path if it's not already in there.
Then it imports the module with the full package/module name and returns the imported module as object.
"""
rootPythonPath, fullModuleName = getPackageRootAndModuleNameFromFilePath(filePath)
# Append rootPythonPath to sys.path if not in sys.path
if rootPythonPath not in sys.path:
sys.path.append(rootPythonPath)
# Import full (module.module.package) name
mod = __import__( fullModuleName, {}, {}, [fullModuleName] )
if reloadModule:
reload(mod)
return mod
這是不可能的,因為命名空間包 - 沒有辦法確定baz.py
的正確包是foo.bar
還是只是具有以下文件結構的bar
:
foo/
bar/
__init__.py
baz.py
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