第八次作业（第十章）

10-1

with open('learning_python.txt') as file_object:
	contents=file_object.read()
	print(contents)

with open('learning_python.txt') as file_object:    
	for line in file_object:
		print(line.rstrip())
with open('learning_python.txt') as file_object:
	lines=file_object.readlines()
for line in lines:
	print(line.rstrip())

10-3

filename="guest.txt"
with open(filename,'w') as file_object:
	for i in range(0,3):
		file_object.write(input("Please input the guest's name:")+'\n')  

10-6

def add():
	one=input("Please input the first number:")
	two=input("Please input the second number:")
	try:
		int(one)
		int(two)
	except ValueError:
		print("you should input numbers that don't contain characters.")
	else:
		sum=int(one)+int(two)
		print(str(sum))
add()
add()

10-11

import json
filename="fav.json"
try:
	with open(filename) as f_obj:
		number=json.load(f_obj)
		print("I know your favorite number is "+str(number))
except FileNotFoundError:
	with open(filename,'w') as f_obj:
		num=input("Please input the number that you like:")
		json.dump(num,f_obj)

10-12

import json
filename="favorite_num.json"

def store():
	with open(filename,'w') as f_obj:
		num=input("Please input your favorite number:")
		json.dump(num,f_obj)

def read():
	try:
		with open(filename) as f_obj:
			number=json.load(f_obj)
			print("I know your favorite number! It's "+number)
	except FileNotFoundError:
		store()

read()