save_path = 'C:/example/'
name_of_file = input('What is the name of the file: ')
completeName = os.path.join(save_path, name_of_file + '.txt')
file1 = open(completeName, 'w')
toFile = input('Write what you want into the field')
file1.write(toFile)
file1.close()
Telling Python to save a .txt file to a certain directory on Windows and Mac