how to declare global variable in python

1#A global variable can be accessed from the hole program.
2
3global var = "Text"

1globvar = 0
2
3def set_globvar_to_one():
4    global globvar    # Needed to modify global copy of globvar
5    globvar = 1
6
7def print_globvar():
8    print(globvar)     # No need for global declaration to read value of globvar
9
10set_globvar_to_one()
11print_globvar()       # Prints 1

1a = 'this is a global variable'
2def yourFunction(arg):
3    #you need to declare a global variable, otherwise an error
4    global a
5    return a.split(' ')
6    

1#### A_FILE.PY
2a_global_variable = "Hello"
3####sys.path.append(".")
4
5##### B_FILE.PY
6import a_file
7
8output = a_file.a_global_variable
9
10print(output)
11------> Hello

1#A global variable can be accessed from any function or method.
2#However, we must declare that we are using the global version and not the local one.
3#To do this, at the start of your function/method write "global" and then the name of the variable.
4#Example:
5myVariable = 1
6
7def myFunction():
8  global myVariable
9  print(myVariable)
10
11myFunction() 

1# If you use the global keyword, the variable belongs to the global scope:
2  
3  def myfunc():
4  global x
5  x = "fantastic"
6
7myfunc()
8
9  
10print("Python is " + x)