Вам нужно вызвать функцию.
def function1(a,b,c):
total_function1 = a + b + c
return total_function1
def function2(a, b, c):
total_function2 = function1(a, b, c) * 0.3
return total_function2
def function3(a, b, c):
total_function3 = function1(a, b, c) * 0.7
return total_function3
или вы можете вызвать ее снаружи и передать значение в:
def function1(a,b,c):
total_function1 = a + b + c
return total_function1
def function2(total_function1):
total_function2 = total_function1 * 0.3
return total_function2
def function3(total_function1):
total_function3 = total_function1 * 0.7
return total_function3
val1 = function1(1, 2, 3)
val2 = function2(val1)
val3 = function3(val1)