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Mr.Barbo
Asked: 2020-01-25 13:58:33 +0800 CST 2020-01-25 13:58:33 +0800 CST

import full module in python

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I have a folder called Commandwhere I keep a script sumawith the following code:

def suma_1(a, b):
    return a+b

and I want to call it from a script in the same folder as Commandthis way:

import os
print(os.path.pardir)

import Command
print(Command.suma.suma_1(1, 3))

I included osit as an example at the top, because that's the way I want to import it. The problem is that it throws me an error warning that it does not exist sumainCommando

..
Traceback (most recent call last):
  File "c:/Users/joaqu/OneDrive/Escritorio/Informatica/ZZZ_CosasImportantes/Python/Importan/Terminal/prueba3.py", line 5, in <module>
    print(Command.suma.suma_1(1, 3))
AttributeError: module 'Command' has no attribute 'suma'

Can I somehow import it without necessarily typing the script name?

I also tried with from Command import *but it didn't work

python

1 Answers

  1. Best Answer

    You are really trying to import a package, not a module. Before Python 3.3 (regular packages only) it was necessary to add an __init__.pyempty file to the package directory for Python to treat it as such. As of Python 3.3 (introduction of namespace packages) you don't need to do this explicitly ( Implicit Namespace Packages ) for Python to consider it as a package.

    Since I assume you use Python >= 3.3, Python already treats it Commandas a package. The real problem is that when you import Command, the interpreter searches the directories in PYTHONPATH until it finds the directory but it doesn't scan that directory recursively and automatically imports all the .py files it finds. That is, suma.pyit is not imported.

    You have several options:

    • Without making use of the file __init__.py(namespace package) or using an __init__.pyempty file (regular package):

      import Command.suma
print(Command.suma.suma_1(1, 3))

      O well:

      from Command import suma
print(suma.suma_1(1, 3))

    • Making use of a file __init__.pywith content:

      Create a file called __init__.pyinside Commandand add the line:

      from . import suma

      Now you can import just like you did in your code:

      import Command
print(Command.suma.suma_1(1, 3))

      The file __init__.pyis executed implicitly, and the objects defined in it are bound to names in the package namespace.

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