Is it possible to define global variables in a function in Python
def function(arguments):
global var_name
var_name = value #must declare global prior to assigning value
This will work in any function, regardless of it is in the same program or not.
Here's another way to use it:
def function():
num = #code assigning some value to num
return num
NOTE: Using the return
built-in will automatically stop the program (or the function), regardless of whether it is finished or not.
You can use this in a function like this:
if function()==5 #if num==5:
#other code
This would allow you to use the variable outside of the function. Doesn't necessarily have to be declared global.
In addition, to use a variable from one function to another, you can do something like this:
import primes as p #my own example of a module I made
p.prevPrimes(10) #generates primes up to n
for i in p.primes_dict:
if p.primes_dict[i]: #dictionary contains only boolean values
print p.primes_dict[i]
This will allow you to use the variable in another function or program without having use a global variable or the return
built-in.
Yes, but why?
def a():
globals()['something'] = 'bob'