Python nonlocal

Python access global variable

globvar = 0

def set_globvar_to_one():
    global globvar    # Needed to modify global copy of globvar
    globvar = 1

def print_globvar():
    print(globvar)     # No need for global declaration to read value of globvar

set_globvar_to_one()
print_globvar()       # Prints 1

Source: stackoverflow.com

Python nonlocal

def to_string(node):
    def actual_recursive(node):
        nonlocal a_str		# ~global, can modify surrounding function's scope.
        a_str += str(node.val)
        if node.next != None:
            actual_recursive(node.next)
    a_str = ''
    actual_recursive(node)
    return a_str

Source: stackoverflow.com

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