Python import with as

Question

I have to files in the same folder

First: (module1.py)

a = 2*np.pi

Second: (MainProg.py)

import numpy as np
from module1 import a 

print(np.pi)
print(a)

When running MainProg.py the error tells me that name np in np.pi is not defined in module1.py. Do I have to extra import numpy as np in modul1.py?

Why import numpy in the second file if it's used in the first? — Carcigenicate, Feb 06 '20 at 14:15
yes, you do, you should import the module where you use it, but you don't need to import it in MainProg.py — RomainL., Feb 06 '20 at 14:16
You should import numpy in the file where you're trying to use it. — khelwood, Feb 06 '20 at 14:16
I want to define some statements in an extra file while using the main programm. I need numpy in both files — LoLiebe, Feb 06 '20 at 14:17

Souleyus · Accepted Answer · 2020-02-06T14:22:01.260

1

Yes you have to.

Why ? because when you import a file in python, this file will be executed. So when your "module1.py" will be executed it will return you an error because "np" is inexistent.

EDIT: Don't see the import in python as a code replacement of the file you imported in your current file. The import will import functions that are in the file you are importing, and execute all codes that is not inside a python function or in the __main__.

edited Feb 06 '20 at 14:22

answered Feb 06 '20 at 14:18

Souleyus

26
4

Okay I understand. So when planing the usage of numpy in both files I have to import it to both? – LoLiebe Feb 06 '20 at 14:20
Yes you have to ! – Souleyus Feb 06 '20 at 14:23

Python import with as

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