local vs global scope in python

In this video you will learn about scope of variable in python. The scope decides where a variable can be used.

global keyword
In python we have two types of scope:
1. Local scope: The variables declared inside a block have local scope to that block, and they cannot be accessed outside that block.
Consider the following example:
def fun1():
x=10#The x is local to the function fun1
print(x)
fun1()#10
print(x)#Generate error, because x is only available inside the fun1() due to its local scope.
2. Global scope: The variables which are global can be accessed anywhere in the program. Generally the variables which are not declared inside a block have global scope. To access a global variable inside function or to make a variable global which is declared inside a block, we use global keyword. Consider the following example:
def fun1():
global x
x=10#The x is local to the function fun1
print(x)
fun1()#10
print(x)#No error, because x is declared global inside the fun1() so after calling fun1() the x becomes a global variable and can be used anywhere.
Note: if you do not call fun1() the x is not created.

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