Global variables:
- Defining a variable outside to all the functions.
- We can access the variable directly.
- It is available throughout the application.
a=10 #global
def m1():
print("Inside m1 :",a)
return
def m2():
print("Inside m2 :",a)
return
m1()
m2()
print("Outside :",a)
- We can define local & global variables with the same name.
- We access both the variables directly using its identity.
- When we access a variable inside the function, it gives the first priority to local variable.
- If local is not present, then it is looking for Global variable.
a=10 #global
def m1():
a=20 #local
print("Inside m1 :",a)
return
def m2():
print("Inside m2 :",a)
return
m1()
m2()
print("Outside :",a)
- Python is interpreted, hence the instructions execute one by one sequentially.
- We cannot access a variable before definition(memory allocation)
a=10
print("a :",a)
b=20
print("b :",b)
print("c :",c) # error : not yet defined
c=30
Global variable can be declared anywhere in the program but outside to all the functions
def m1():
print("a value :",a)
return
def m2():
print("b value :",b)
return
a=10 #global
b=20 #global
m1()
m2()
- We cannot access a function before its definition
- Python is interpreted
test() #Error : not yet defined
def test():
print("func..")
return
test() #allow
Check the output:
def m1():
print("a value :",a)
return
def m2():
print("b value :",b)
return
a=10 #global
m1()
m2()
b=20 #global
- We can access global variable inside the function
- We cannot modify the global variable from function directly.
a=10
def test():
print("a val :",a)
a=a+20 #error :
print("a val :",a)
return
test()
