Change variable in an outside file

[ebolisa]

a.py

ssid = 'myssid'
password = 'mypass'
ap_mode = 'yes'

b.py

import a

print(a.ap_mode)
# output -> yes

# modify variable
a.ap_mode.append('no') # not correct
print(a.ap_mode)
# output -> yes "it should be no"

Hi,

How do I change a variable from one file to another without using json/dict/list?

TIA

[deanhystad]

Your problem has nothing to do with objects being in different modules and everything to do with str not knowing how to "append()". It would work if you used a.ap_mode='no' instead a.ap_mode.append('no')
junk2.py

x = 5
def print_x():
    print(x)

junk.py

import junk2
junk2.x = 1
junk2.print_x()

Output:
1

[ebolisa]

Your problem has nothing to do with objects being in different modules and everything to do with str not knowing how to "append()". It would work if you used a.ap_mode='no' instead a.ap_mode.append('no')

That was my first choice but it doesn't work.

With your example, your're changing the variable when in use but x still remains 5 it doesn't change to 1.

[ebolisa]

I also tried this with no avail:

#read input file
fin = open("a.py", "rt")
#read file contents to string
data = fin.read()
#replace all occurrences of the required string
data = data.replace('ap_mode =' + "'no'", 'ap_mode =' + "'yes'")
#close the input file
fin.close()
#open the input file in write mode
fin = open("a.py", "wt")
#overrite the input file with the resulting data
fin.write(data)
#close the file
fin.close()

[deanhystad]

This problem has nothing at all to do with variables in other files and everything to do with how import works. My previous example changed the value of a variable in another module, but that was not the question you are asking. You want to know how to make a change persistant.

To make your program permanently remember anything it has to be saved in a file. The file is is usually a database file or a json file or just a text file, but I suppose you could modify a .py file and use that to remember a variable's value. One problem with a .py file is that to see any changes you need to reload the module. Also any objects created in the old module will not change to reflect changes made to the .py file. This makes using a .py file kind of a one shot thing. You can only change the file and expect the changes to take affect the next time you start your program and import the modified file.

[ebolisa]

You can only change the file and expect the changes to take affect the next time you start your program and import the modified file.

Ok, got it. For the variable to change in file 'a' I should better use dictionary/json format. Thank you.