Python-сообщество

 G = 6.67 * 10 ** -11
pi = 3.14
r = 10
σ = 10
h = 10
while True:
    x = input('Input X: ')
    for i in x.split(' '):
        F = (2 * pi * σ * G * h * r ** 2) / ((h ** 2) + (int(i) ** 2))
        print(F)

 Input X: 10
2.09438e-08
Input X: 10 20
2.09438e-08
8.37752e-09
Input X:

 class SaveTo:
    def __init__(self,name_file):
        self.file=open(name_file,'w')
    def write(self,item):
        self.file.write( '%s\n' %str(item))
    @property
    def close_file(self):
        self.file.close()
Output=SaveTo('output_x.txt')
G = 6.67 * 10 ** -11
pi = 3.14
r = 10
σ = 10
h = 10
while True:
    x = input('Input X: ')
    for i in x.split(' '):
        try:
            F = (2 * pi * σ * G * h * r ** 2) / ((h ** 2) + (int(i) ** 2))
            print(F)
            Output.write(F)
        except ValueError:
            print('Ничего не введено, сохраняем файл')
            Output.close_file