python 檔案和異常處理__python

#10-1 python學習筆記

with open("learnpy.txt") as file_pro:    contents = file_pro.read()    print(contents)with open("learnpy.txt") as file_pro:    for line in file_pro:        print(line)with open("learnpy.txt") as file_pro:    lines = file_pro.readlines()for line in lines:    print(line)

#10-2 replace python with c

for line in lines:    print(line.replace('Python','c'))

#10-3 寫入檔案

print("please input your name")user_name = input()with open("guest.txt",'w') as file_ob:    file_ob.write(user_name)

#10-4 向檔案中添加使用者

while True:    message = input("please input your name")    if(message == 'quit'):        break    print("hello"+" "+message)    with open('guest_list.txt', 'a') as file_object:        file_object.write(message+'\n')

#10-7 加法計算機

print("Give me two numbers, and I'll add them.")print("Enter 'q' to quit.")while True:    first_number = input("\nFirst number: ")    if first_number == 'q':        break    second_number = input("Second number: ")    try:        answer = int(first_number) + int(second_number)    except ValueError:        print("illegal input")    else:        print(answer)

#10-8 貓和狗

def printFile(file_name):    try:        with open(file_name) as file_ob:            print(file_ob.read())    except FileNotFoundError:          msg = file_name + " does not exist."          print(msg)printFile("cats.txt")printFile("dogs.txt")printFile("cat.txt")

#10-9 貓和狗,檔案不存在程式沉默

def printFile2(file_name):    try:        with open(file_name) as file_ob:            print(file_ob.read())    except FileNotFoundError:          passprintFile2("cats.txt")printFile2("dogs.txt")printFile2("cat.txt")

#10-11 喜歡的數字 import json

love = input("input your luck number")with open("json.txt",'w') as file_ob:    json.dump(love,file_ob)with open("json.txt") as file_ob:    print("you love number "+ json.load(file_ob))