import

问题 When I try to import a named import, it fails silently if the name import does not exist. Is there a way to get webpack to fail loudly when it cannot find the import at build time For example: // file1.js const var1 = 'var1' export { var1 } and // file2.js import { var2 } from './file1' // at this point, var2 is undefined at runtime because it was never exported from file1.js Instead, I want it to fail at build time. Is there a webpack option or some other technique I can use to catch this

问题 I'm trying to import a function which is in a module inside a package in Python, but when I try: from package.module import some_function Python executes the package's _ init _.py but it can't happen. Is there a way to import the function telling Python to ignore the package's _ init _.py? 回答1: The answer is No, you can't import a python package without the __init__.py being executed. By definition, to make a package, you must put in that directory a __init__.py. But, you can make an empty _

问题 I created a Pair class in Java (similar to the c++ pair) and am having trouble referencing it from a different java file. I am working inside a Java file, let's call it fileA in the same directory as Pair.class. Additionally, I have written package current-directory at the top of both files. However, when I try javac fileA all my errors are cannot find symbol and the little arrow points to my custom Pair type. How do I get the java compiler to see Pair.class inside of fileA ? Thanks for all

问题 I have 8 CSV files all in the same directory, and need them importing into a single data frame in R. They all follow the same naming convention, "dataUK_1.csv", "dataUK_2.csv" etc., and have the exact same structure in terms of columns. I've managed to create a vector of all the file names (including the full directory) by using: files = list.files("/Users/iarwain/Data", pattern=".csv", full.names=T) I'm just not sure how to pass these names to the read.csv command so that it loops 8 times,

问题 How do I make a C extension for python 3.x when a module has sub-modules? For example, I have a file called pet.c: #include <Python.h> PyObject* CatMeow(PyObject* self) { return PyUnicode_FromString( ">*<" ); } static PyMethodDef CatFunctions[] = { {(char*) "meow", (PyCFunction) CatMeow, METH_NOARGS, NULL}, {NULL, NULL, 0, NULL} }; static PyModuleDef CatDef = { PyModuleDef_HEAD_INIT, "cat", "cat ext", -1, CatFunctions, NULL, NULL, NULL, NULL }; PyMODINIT_FUNC PyInit_cat(void) { return

问题 I'm using pylint + pydev, with python 2.6. I have a module with just this line of code from email import Message Now when I try to run this module it runs fine. But pylint reports an error: ID: E0611 No name 'Message' in module 'email' Although it exists... Any idea why? 回答1: I like pylint, but I do find I have to use a lot of # pylint: disable-msg=E0611 and the like to make it shut up in cases that are perfectly correct but confuse it (for example, like in this case, due to email 's playing

问题 I bought a 3D Model of a room. The model is in the .obj format. Now, I'm trying to import this model into Unity3D. The Model came with: 5 x .obj files 5 x .mtl files n x .jpg files n x .tga files The .mtl files contained paths that do not exist on my PC. So I removed the paths. The images files ( .jpg & .mtl ) are in the same directory as the .obj files. When I tried to import the .obj files, the room has no material on it. I then tried to use the FBX converter (with "Embed media" checked) to

问题 I have created a mongo dump from a remote server and .bson and .metadata files stored in to a folder. I want to import this folder into my local mongodb . I am using robomongo as a mongodb client ui . I got some command which are importing json files one by one but I want import all the files at a time by robomongo or cmd. 回答1: mongodump is a util for creating a binary export of the database. mongodump is used in conjunction with mongorestore as a backup strategy. If you wanted to restore

问题 When I import and use a function in a python(2.6.5) program, I get an error: from Localization import MSGR title = Localization.MSGR("Logfile from Ctf2Rrl.") NameError: global name 'Localization' is not defined Could you please explain why? Regards, 回答1: If you import your method like this, you can user MSGR but not Localization.MSGR :) If you want to use Localization.MSGR , you can just import Localization 回答2: The import statement of the form: from foo import bar Doesn't introduce the

问题 When I import and use a function in a python(2.6.5) program, I get an error: from Localization import MSGR title = Localization.MSGR("Logfile from Ctf2Rrl.") NameError: global name 'Localization' is not defined Could you please explain why? Regards, 回答1: If you import your method like this, you can user MSGR but not Localization.MSGR :) If you want to use Localization.MSGR , you can just import Localization 回答2: The import statement of the form: from foo import bar Doesn't introduce the