Develop Reference

Getting Error while importing functions from a file which takes runtime arguments

I have a file Main.py which takea one runtime argument NoOftimes. Which I store in NoOftimes = sys.argv[1]
I tried to run help.py for NoOftimes in a function of Main.py but getting error
def RunScriptForTime(NoOftimes):
for i in range(NoOftimes):
print("File is opened........")
os.system('python help.py')
time.sleep(300)
print("Opening File again.....")
RunScriptForTime(NoOftimes)
ERROR
File is opened........
Traceback (most recent call last):
File "E:\projects\psx\help.py", line 11, in <module>
from Main import getCompanyId, getLastId, getNameIdx, isCompanyExist
File "E:\projects\psx\Main.py", line 8, in <module>
NoOftimes = int(sys.argv[1])
Note
I am importing some functions of Main.py in help.py maybe it is because of it require runtime arguments there. Can you spot the error what i did wrong

My Problem is solved now. It was because the Main.py was run every time the help.py was opened.
Use
if __name__ == "__main__":
import sys
NoOfTimes = sys.argv[1]
RunScriptForTime(NoOfTimes)
sys.exit()
The Main.py will run this block of code only if python script is directly run by user.

Wierd attribute error with importing into directories

I have a directory tree as follows:
main.py
dir1
sub1.py
sub2.py
In main.py:
import dir1.sub1
In dir1/sub1.py:
def f1() -> None:
print("f1")
import dir1.sub2
dir1.sub2.f2()
In dir1/sub2.py:
import dir1.sub1
def f2() -> None:
dir1.sub1.f1()
print("f2")
When I run main.py, I get the following error message:
Traceback (most recent call last):
File "...\main.py", line 1, in <module>
import dir1.sub1
File "...\dir1\sub1.py", line 7, in <module>
dir1.sub2.f2()
File "...\dir1\sub2.py", line 5, in f2
dir1.sub1.f1()
AttributeError: module 'dir1' has no attribute 'sub1'. Did you mean: 'sub2'?
(Where the ... at the beginning of the file path is my working directory.)
If I change main.py to
import dir1.sub2
I get a slightly different error message:
Traceback (most recent call last):
File "...\main.py", line 1, in <module>
import dir1.sub2
File "...\dir1\sub2.py", line 1, in <module>
import dir1.sub1
File "...\dir1\sub1.py", line 7, in <module>
dir1.sub2.f2()
AttributeError: module 'dir1' has no attribute 'sub2'
If I move sub1.py and sub2.py to the same directory as main.py and re‐direct imports as necessary, I get the expected output of
f1
f2
Why does this happen, and how can I make it not happen?

You need to use absolute import because Python 3 only supports that. In Python 2 your method will work. So for example if you have import dir1.sub2 change it to from dir1 import sub2. See here.
Note: I've tested it with your setup and it works.

Function not defined error while using import

I created two files in python
First one is
mym.py
def hello():
print("Hello everyone")
return
def summ(x,y):
total=x+y
return total
and next one is
abc.py
import mym
hello()
x=summ(3,4)
print(x)
And the error msg which I am getting is...both the files are in same working directory and there is no error of module not found...its giving error of function not defined.
Traceback (most recent call last):
File "C:/Users/Nisha/AppData/Local/Programs/Python/Python39/abc.py", line 3, in <module>
hello()
NameError: name 'hello' is not defined
Traceback (most recent call last):
File "C:/Users/Nisha/AppData/Local/Programs/Python/Python39/abc.py", line 3, in <module>
x=summ(3,4)
NameError: name 'summ' is not defined
What is the problem in function definition I am unable to trace...

The abc.py needs to be changed to:
from mym import *
hello()
x=summ(3,4)
print(x)
Otherwise you cannot access the functions.

You can try like this:
import mym
mym.hello()
x = mym.summ(3,4)
print(x)

importing other file and using functions from main

Note: I have reduced my problem so the code is only a few lines (compared to 600)
I have a problem: from main.py I want to import file slave.py. slave.py references a function from main.py, and of course I get a NameError: name 'funcFromMain' is not defined
Here is my code for main.py:
import slave
def funcFromMain():
return 6
print(slave.funcFromSlave())
And here is my code for slave.py:
def funcFromSlave():
one = funcFromMain() # <- this doesn't work
two = 2
return (one + two)
I am getting exact error: (note that both files are in exactly the same directory)
Traceback (most recent call last):
File "C:\Users\PrinceOfCreation\Documents\test\main.py", line 6, in <module>
print(slave.funcFromSlave())
File "C:\Users\PrinceOfCreation\Documents\test\slave.py", line 2, in funcFromSlave
one = funcFromMain()
NameError: name 'funcFromMain' is not defined
I tried adding import main at the top of slave.py, and got the following error:
Traceback (most recent call last):
File "C:\Users\PrinceOfCreation\Documents\test\main.py", line 1, in <module>
import slave
File "C:\Users\PrinceOfCreation\Documents\test\slave.py", line 1, in <module>
import main
File "C:\Users\PrinceOfCreation\Documents\test\main.py", line 6, in <module>
print(slave.funcFromSlave())
AttributeError: module 'slave' has no attribute 'funcFromSlave'
With from slave import funcFromSlave instead at the top of main:
Traceback (most recent call last):
File "C:\Users\PrinceOfCreation\Documents\test\main.py", line 6, in <module>
print(funcFromSlave())
File "C:\Users\PrinceOfCreation\Documents\test\slave.py", line 2, in funcFromSlave
one = funcFromMain()
NameError: name 'funcFromMain' is not defined

First you can't import a python module like this :
import slave.py
It must be
from slave import funcFromSlave # to get the funcFromSlave function from slave script
And you need to make sure that the slave.py is in the same directory of main.py or
you need to precise the subdirectory where slave.py exists
And for the later error, its best if you avoid circular imports, cause it will create problems, best to do is to send the value of funcFromMain() to funcFromSlave
main.py :
from slave import funcFromSlave
def funcFromMain():
return 6
print(funcFromSlave(funcFromMain()))
slave.py :
def funcFromSlave(funcFromMain):
one = funcFromMain
two = 2
return (one + two)
output when running main.py :
8

Define method from external module (Python)

I'm trying to define a method (let's call it hello) in main.py's Things class, from define.py.
The code I currently have is raising AttributeError: module 'runme' has no attribute 'promptMe' (full traceback below).
Here's main.py's code:
import define
class Things:
def doWhatever():
print("whatever")
Here's define.py's code:
import main
def hello():
print("Hello!")
main.Things.hello = hello()
I've tried other solutions such as def main.Things.hello: hello() and def main.Things.hello: print("Hello!") but none work.
Here's the traceback when running define.py:
Traceback (most recent call last):
File "define.py", line 5, in <module>
import main
File "/path/to/main.py", line 9, in <module>
import define
File "/path/to/define.py", line 10, in <module>
main.Things.hello = hello
AttributeError: module 'main' has no attribute 'Things'
All help would be greatly appreciated. Thanks!