高级编程技术第十次作业

第十章 文件和异常

10-1 Python学习笔记

with open("hw.txt") as file_object:
contents = file_object.read()
print (contents)

with open("hw.txt") as file_object:
for line in file_object.readlines():
print (line)

with open("hw.txt") as file_object:
li = file_object.readlines()
print (li)

10-2 C语言学习笔记

with open("hw.txt") as file_object:
contents = file_object.readlines()
for line in contents:
line = line.replace("Python", "C")
print (line.rstrip())

10-3 访客

name = input("Please input your name: ")
with open("guest.txt", "w") as file_object:
file_object.write(name)

10-4 访客名单

with open("guest_book.txt", "w") as file_object:
while True:
name = input("Please input your name: ")
greeting = "Welcome, " + name
print (greeting)
file_object.write(greeting + "\n")

10-5 关于编程的调查

with open("Reason.txt", "w") as file_object:
while True:
reason = input("Why do you love programing? ")
file_object.write(reason + "\n")

10-6 加法运算

print ("Please input two numbers: ")

try:
number1 = input()
number1 = int(number1)
number2 = input()
number2 = int(number2)
except ValueError:
print ("Your input is informal")
else:
print ("The numbers' addition you input is " + str(int(number1) + int(number2)))

10-7 加法计算器

while True:
print ("Please input two numbers: ")
try:
number1 = input()
number1 = int(number1)
number2 = input()
number2 = int(number2)
except ValueError:
print ("Your input is informal")
else:
print ("The numbers' addition you input is " + str(int(number1) + int(number2)))

10-8 猫和狗

try:
with open("cats.txt") as file_object:
print (file_object.read())
except FileNotFoundError:
print ("The file you want is not exist.")

10-9 沉默的猫和狗

try:
with open("cats.txt") as file_object:
print (file_object.read())
except FileNotFoundError:
pass

10-11 喜欢的数字

import json

filename = "hw.json"
with open(filename, "w") as file_object:
number = input("Please input your faviourite number: ")
json.dump(number, file_object)

with open(filename) as file_object:
number = json.load(file_object)
print ("I know it " + number)

10-12 记住喜欢的数字

import json

filename = "hw.json"

try:
with open(filename) as file_object:
number = json.load(file_object)
print (number)
except FileNotFoundErr
4000
or:
with open(filename, "w") as file_object:
number = input("Please input your faviourite number: ")
number = int(number)
json.dump(number, file_object)