Trying to use eval to dynamically assign variables

Question

I have a bunch of variables in a Python script like this:

pauseTime = 10
cameraSrc = "rtsp://cameraadress"
useCuda = True

But I'm getting from an API the new values for this variables and I'm trying to do the following:

for key,value in func.configJsonIot.items():
    if key == "debug":
        continue
    else:
        if debug:
            print("Sobrescrevendo valores locais pelos da API key: {} | value: {}".format(key, value))
        eval(str(key)) = value

this is returning me this error:

SyntaxError: cannot assign to function call

How can I change the global variables with the API values?

Is there a reason you're not just using a dictionary? Then you can do `var_dict = {}; var_dict["useCuda"] = False; print(var_dict["useCuda"])`. — Carcigenicate, Oct 22 '20 at 18:14
The proposed duplicate is not just indirectly on-point; it has answers describing the same `globals()` practice the OP's own answer uses. — Charles Duffy, Oct 22 '20 at 20:09

score 0 · Answer 1 · edited Oct 22 '20 at 20:07

0

assign a variable to the function and then use that in the for loop.

so

json_items = func.confJsonIot.items()

then

for key,value in json_items: ...

this will give you a dict called json_items that you can use in the print statement.

edited Oct 22 '20 at 20:07

Timus

10,974
5
14
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answered Oct 22 '20 at 18:18

doug jarus

1
2

score 0 · Answer 2 · answered Oct 22 '20 at 18:21

0

i found the solution for this:

for key,value in func.configJsonIot.items():
    if key == "debug":
        continue
    else:
        if debug:
            print("Sobrescrevendo valores locais pelos da API key: {} | value: {}".format(key, value))
        globals()[key]=value

globals() function can acess all global variables running

answered Oct 22 '20 at 18:21

Jasar Orion

626
7
26

Why do you need to use `globals()`? You already have all `key: value` pairs in `func.configJsonIot`... – Tomerikoo Oct 22 '20 at 19:52
becouse a need to overhide the already generated in hardcode and already in use vars while my code is running acordinh to API result – Jasar Orion Oct 22 '20 at 20:04
Put your variables in a dict from the first place and then update the dict... – Tomerikoo Oct 22 '20 at 20:04
yes but i cannot change the entire code right now :( – Jasar Orion Oct 22 '20 at 20:07
at total i need to overhide 135 variables :( the system is huge – Jasar Orion Oct 22 '20 at 20:07
So? What's the difference if they are variables or inside a dict? It's not a big enough difference. `135` variables is really not that much... – Tomerikoo Oct 22 '20 at 20:12
i agree but i need to change to many files and big part of then i cannot modify – Jasar Orion Oct 22 '20 at 20:29

Trying to use eval to dynamically assign variables

2 Answers2