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Questions tagged [package]

Package broadly refers to two things: 1) a usable unit/component of built/compiled software, or 2) a partition of the global namespace (Java).

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3792 votes
14 answers
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What is __init__.py for?

What is __init__.py for in a Python source directory?
Mat's user avatar
  • 85.2k
716 votes
19 answers
1.0m views

How should I deal with "package 'xxx' is not available (for R version x.y.z)" warning?

I tried to install a package, using install.packages("foobarbaz") but received the warning Warning message: package 'foobarbaz' is not available (for R version x.y.z) Why doesn't R think that the ...
Richie Cotton's user avatar
652 votes
30 answers
528k views

Can you find all classes in a package using reflection?

Is it possible to find all classes or interfaces in a given package? (Quickly looking at e.g. Package, it would seem like no.)
Jonik's user avatar
  • 81.2k
306 votes
34 answers
1.8m views

How can I solve "java.lang.NoClassDefFoundError"?

I've tried both the examples in Oracle's Java Tutorials. They both compile fine, but at run time, both come up with this error: Exception in thread "main" java.lang.NoClassDefFoundError: ...
Jonathan Lam's user avatar
  • 17.3k
842 votes
23 answers
664k views

How to fix "Attempted relative import in non-package" even with __init__.py

I'm trying to follow PEP 328, with the following directory structure: pkg/ __init__.py components/ core.py __init__.py tests/ core_test.py __init__.py In core_test.py I have ...
skytreader's user avatar
  • 11.6k
672 votes
8 answers
174k views

What is the difference between require() and library()?

What is the difference between require() and library()?
Marco's user avatar
  • 9,564
407 votes
32 answers
1.2m views

"pip install unroll": "python setup.py egg_info" failed with error code 1

I'm trying to install some packages with pip. But pip install unroll gives me Command "python setup.py egg_info" failed with error code 1 in C:\Users\MARKAN~1\AppData\Local\Temp\pip-build-...
benjaminh's user avatar
  • 4,079
388 votes
12 answers
240k views

Sibling package imports

I've tried reading through questions about sibling imports and even the package documentation, but I've yet to find an answer. With the following structure: ├── LICENSE.md ├── README.md ├── api │   ├...
zachwill's user avatar
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699 votes
23 answers
2.0m views

How to install pip with Python 3?

I want to install pip. It should support Python 3, but it requires setuptools, which is available only for Python 2. How can I install pip with Python 3?
deamon's user avatar
  • 91.3k
252 votes
7 answers
148k views

How to read a (static) file from inside a Python package?

Could you tell me how can I read a file that is inside my Python package? My situation A package that I load has a number of templates (text files used as strings) that I want to load from within ...
ronszon's user avatar
  • 3,237
426 votes
5 answers
206k views

Is __init__.py not required for packages in Python 3.3+

I am using Python 3.5.1. I read the document and the package section here: https://docs.python.org/3/tutorial/modules.html#packages Now, I have the following structure: /home/wujek/Playground/a/b/...
wujek's user avatar
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381 votes
6 answers
211k views

What is the purpose of the -m switch?

Could you explain to me what the difference is between calling python -m mymod1 mymod2.py args and python mymod1.py mymod2.py args It seems in both cases mymod1.py is called and sys.argv is ['...
Charles Brunet's user avatar
850 votes
10 answers
358k views

What's the difference between a module and package in Python?

What's the difference between a module and package in Python? See also: What's the difference between "package" and "module"? (for other languages)
Dave's user avatar
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595 votes
15 answers
708k views

beyond top level package error in relative import [duplicate]

It seems there are already quite some questions here about relative import in python 3, but after going through many of them I still didn't find the answer for my issue. so here is the question. I ...
shelper's user avatar
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451 votes
35 answers
256k views

Elegant way to check for missing packages and install them?

I seem to be sharing a lot of code with coauthors these days. Many of them are novice/intermediate R users and don't realize that they have to install packages they don't already have. Is there an ...
Maiasaura's user avatar
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107 votes
2 answers
250k views

What does "The following object is masked from 'package:xxx'" mean?

When I load a package, I get a message stating that: "The following object is masked from 'package:xxx' For example, if I load testthat then assertive, I get the following: library(testthat) ...
Richie Cotton's user avatar
67 votes
4 answers
29k views

Cannot install R-forge package using install.packages

This, question, is, asked, over, and, over, and, over, on the R-sig-finance mailing list, but I do not think it has been asked on stackoverflow. It goes like this: Where can I obtain the latest ...
GSee's user avatar
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233 votes
10 answers
123k views

NodeJS require a global module/package

I'm trying to install globally and then use forever and forever-monitor like this: npm install -g forever forever-monitor I see the usual output and also the operations that copy the files to the ...
alexandernst's user avatar
  • 14.8k
438 votes
19 answers
1.1m views

Relative imports - ModuleNotFoundError: No module named x

This is the first time I've really sat down and tried python 3, and seem to be failing miserably. I have the following two files: test.py config.py config.py has a few functions defined in it as ...
blitzmann's user avatar
  • 7,645
3015 votes
32 answers
2.2m views

Find the version of an installed npm package

How can I find the version of an installed Node.js or npm package? This prints the version of npm itself: npm -v <package-name> This prints a cryptic error: npm version <package-name> ...
Laurent Couvidou's user avatar
66 votes
3 answers
34k views

Is the use of Java's default package a bad practice?

Is the use of Java's default package a bad practice?
H2ONaCl's user avatar
  • 11.1k
207 votes
3 answers
186k views

Execution of Python code with -m option or not [duplicate]

The python interpreter has -m module option that "Runs library module module as a script". With this python code a.py: if __name__ == "__main__": print __package__ print __name__ I tested ...
prosseek's user avatar
  • 188k
163 votes
5 answers
86k views

How do I create a namespace package in Python?

In Python, a namespace package allows you to spread Python code among several projects. This is useful when you want to release related libraries as separate downloads. For example, with the ...
joeforker's user avatar
  • 41.3k
697 votes
4 answers
375k views

What is a Python egg?

I'm trying to understand how Python packages work. Presumably eggs are some sort of packaging mechanism, but what would be a quick overview of what role they play and may be some information on why ...
Bialecki's user avatar
  • 30.7k
679 votes
11 answers
571k views

Installing a local module using npm?

I have a downloaded module repo, I want to install it locally, not globally in another directory? What is an easy way to do this?
fancy's user avatar
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177 votes
12 answers
69k views

Painless way to install a new version of R?

Andrew Gelman recently lamented the lack of an easy upgrade process for R (probably more relevant on Windows than Linux). Does anyone have a good trick for doing the upgrade, from installing the ...
Shane's user avatar
  • 99.7k
129 votes
3 answers
210k views

Python: importing a sub‑package or sub‑module

Having already use flat packages, I was not expecting the issue I encountered with nested packages. Here is… Directory layout dir | +-- test.py | +-- package | +-- __init__.py |...
Hibou57's user avatar
  • 7,030
389 votes
16 answers
275k views

How to install a private NPM module without my own registry?

I've taken some shared code and put it in an NPM module, one I don't want to upload to the central registry. The question is, how do I install it from other projects? The obvious way is probably to ...
futlib's user avatar
  • 8,368
52 votes
4 answers
54k views

How do I install a package that has been archived from CRAN?

I typed the following in the R command line: install.packages("RecordLinkage") I got the following error: Warning in install.packages : package ‘RecordLinkage’ is not available (for R version 3....
Rainmaker's user avatar
  • 1,221
447 votes
24 answers
1.0m views

Python 3: ImportError "No Module named Setuptools"

I'm having troubles with installing packages in Python 3. I have always installed packages with setup.py install. But now, when I try to install the ansicolors package I get: importerror "No ...
user1994934's user avatar
  • 4,473
438 votes
16 answers
484k views

How to get package name from anywhere?

I am aware of the availability of Context.getApplicationContext() and View.getContext(), through which I can actually call Context.getPackageName() to retrieve the package name of an application. ...
ef2011's user avatar
  • 10.6k
115 votes
3 answers
80k views

Absolute vs. explicit relative import of Python module

I'm wondering about the preferred way to import packages in a Python application. I have a package structure like this: project.app1.models project.app1.views project.app2.models project.app1.views ...
Daniel Hepper's user avatar
34 votes
5 answers
30k views

Create cross platform Java SWT Application

I have written a Java GUI using SWT. I package the application using an ANT script (fragment below). <jar destfile="./build/jars/swtgui.jar" filesetmanifest="mergewithoutmain"> <manifest&...
mchr's user avatar
  • 6,231
949 votes
5 answers
470k views

What is thread safe or non-thread safe in PHP?

I saw different binaries for PHP, like non-thread or thread safe? What does this mean? What is the difference between these packages?
O..'s user avatar
  • 11.2k
207 votes
15 answers
537k views

Can't import my own modules in Python

I'm having a hard time understanding how module importing works in Python (I've never done it in any other language before either). Let's say I have: myapp/__init__.py myapp/myapp/myapp.py myapp/...
user avatar
102 votes
5 answers
70k views

How include static files to setuptools - python package

I want to include the ./static/data.txt to setuptools, here is my code: # setup.py import os,glob from setuptools import setup,find_packages setup( name = "PotatoProject", version = "0.1.1", ...
joaoricardo000's user avatar
782 votes
8 answers
578k views

How can I specify the required Node.js version in package.json?

I have a Node.js project that requires Node version 12 or higher. Is there a way to specify this in the packages.json file, so that the installer will automatically check and inform the users if they ...
Erel Segal-Halevi's user avatar
675 votes
12 answers
576k views

How to unload a package without restarting R

I'd like to unload a package without having to restart R (mostly because restarting R as I try out different, conflicting packages is getting frustrating, but conceivably this could be used in a ...
Ari B. Friedman's user avatar
717 votes
13 answers
553k views

How do I remove packages installed with Python's easy_install?

Python's easy_install makes installing new packages extremely convenient. However, as far as I can tell, it doesn't implement the other common features of a dependency manager - listing and removing ...
ire_and_curses's user avatar
43 votes
2 answers
107k views

How to uninstall R and RStudio with all packages, settings and everything else?

I messed up something and there is a problem with tidyverse. Tried to find a solution but spend lots of time without result. How to uninstall R and RStudio with all packages, settings and everything ...
vasili111's user avatar
  • 6,590
2 votes
2 answers
6k views

How to import members of all modules within a package?

I am developing a package that has a file structure similar to the following: test.py package/ __init__.py foo_module.py example_module.py If I call import package in test.py, I want the ...
Tyler Crompton's user avatar
208 votes
9 answers
206k views

How to use custom packages

I'm trying to create and use a custom package in Go. It's probably something very obvious but I cannot find much information about this. Basically, I have these two files in the same folder: mylib.go ...
laurent's user avatar
  • 89.9k
201 votes
12 answers
132k views

how to install multiple versions of package using npm

Due to https://github.com/npm/npm/issues/2943, npm will never support the ability to alias packages and install multiple versions of the same package. The workarounds posted on the github issue might ...
mark's user avatar
  • 4,940
135 votes
7 answers
113k views

List all the modules that are part of a python package?

Is there a straightforward way to find all the modules that are part of a python package? I've found this old discussion, which is not really conclusive, but I'd love to have a definite answer before ...
static_rtti's user avatar
  • 55.2k
544 votes
6 answers
262k views

What is the convention for word separator in Java package names?

How should one separate words in package names? Which of the following are correct? com.stackoverflow.my_package (Snake Case using underscore) com.stackoverflow.my-package (Kebab Case using hyphens) ...
Jigar's user avatar
  • 9,271
281 votes
4 answers
334k views

Where does R store packages?

The install.packages() function in R is the automatic unzipping utility that gets and install packages in R. How do I find out what directory R has chosen to store packages? How can I change the ...
Milktrader's user avatar
  • 9,708
156 votes
5 answers
62k views

Java packages com and org

What are the meaning of the packages org and com in Java?
Gabriel's user avatar
  • 1,569
132 votes
16 answers
123k views

How to change package name of Android Project in Eclipse?

I have an Android project created in Eclipse. I want to modify the package name and application of the project. How do I do that in Eclipse?
Dheepak's user avatar
  • 1,381
7 votes
2 answers
39k views

Error: "there is no package called ..." and trying to use install.packages to solve it

The R studio I have in my university computer gives me an error when I try to download different packages, whereas when I'm with my laptop in the university server, I don't get this error. Because of ...
M.P.'s user avatar
  • 111
876 votes
10 answers
1.2m views

Can I force pip to reinstall the current version?

I've come across situations where a current version of a package seems not to be working and requires reinstallation. But pip install -U won't touch a package that is already up-to-date. I see how to ...
orome's user avatar
  • 47.6k

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