How can I convert string values into python variables?
The setup is the following: I have variable_names = ['a', 'b', 'c'] and I would like to create for each item in variable_name a variable which I can assign a value to (like this a = 10, b = 20, c = 30). I do not want a dictionary. When I print(a) I should get 10.
I just cobbled a quick example to do what you want to do, I do not recommend that you do this, but I will assume that you have a good reason to and will therefore help.
vars = ["a", "b", "c"]
for i in range(len(vars)):
globals()[vars[i]] = (i+1)*10
print(a) # 10
print(b) # 20
print(c) # 30
This example may be a little complicated but it does exactly what you asked for in your question, long story short you can use the globals() function to turn a string into a variable. Link for more info here: https://www.pythonpool.com/python-string-to-variable-name/
Built-in function globals() give you access to all variable in our code. So, with that you can convert each of your string to variable, like
globals()['a'] = 5
print(a) # 5
So, you need just to iterate through list and assign each variable to desired value.
values = [10, 20, 30]
for i in range(len(variable_names)):
globals()[variable_names[i]] = values[i]
There are multiple ways to do so.
vars():>>> a = ['a', 'b', 'c']
>>> vars()[a[0]] = 5
>>> a
5
exec():>>> exec("b=5")
>>> b
5
Dynamically executing code in exec can be dangerous especially if you are using user input. So make sure you know what you are doing.
There are also other methods to achieve this which are described in this G4G article here.
a = sp.Symbol('a')using the sympy library. This is whyaneeds to be a stand alone variable.