《python编程：从入门到实践》答案（第十章）-蒲公英云

《python编程：从入门到实践》答案（第十章）

第十章

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

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contents=''
with open("learning_python.txt") as file_object:
    lines=file_object.readlines()
for line in lines:
    line=line.replace('python','C')
    print(line.rstrip())

name=input("Please enter your name: ")
file_name='guest.txt'
with open(file_name,'a') as file_object:
    file_object.write(name+"\n")
with open(file_name) as need_read:
    lines=need_read.readlines()

file_name='guest.txt'
while(True):
    name=input("Please enter your name: ")
    if name!='quit':
        with open(file_name,'a') as file_object:
            file_object.write(name+"\n")
    else:
        break

file_name='reason.txt'
while(True):
    reason=input("Why you love programming ? ")
    if reason!='quit':
        with open(file_name,'a') as file_object:
            file_object.write(reason+'\n')
    else:
        break
with open(file_name) as need_r:
    lines=need_r.readlines()
for line in lines:
    print(line.rstrip())

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try:
    num_1=input("Please enter the first number: ")
    x=int(num_1)
    num_2=input("Please enter the second number: ")
    y=int(num_2)
except ValueError:
    print("your input is not a number,try again.")
else:
    print(x+y)

print("Please enter two numbers.\n")
print("Enter 'q' to quit.")
while True:
    try:
        num_1=input("Please enter the first number: ")
        if num_1=='q':
            break
        x=int(num_1)
        num_2=input("Please enter the second number: ")
        if num_2=='q':
            break
        y=int(num_2)
    except ValueError:
        print("your input is not a number,try again.")
    else:
        print(x+y)

file_name='dogs.txt'
try:
    with open(file_name) as f:
        contents=f.read()
except FileNotFoundError:
    print("Tis file does not exist.")
else:
        print(contents)

file_name='dogs.txt'
try:
    with open(file_name) as f:
        contents=f.read()
except FileNotFoundError:
    pass
else:
        print(contents)

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try:
    with open('alice.txt') as f:
        contents=f.read()
except FileNotFoundError:
    print("sorry ,this file does not exit.")
else:
    words_num=contents.lower().count('the')
    print(words_num)

import json
fav_num=input("Enter your favorite number: ")
file_name="favnum.json"
with open(file_name,'w') as f:
    json.dump(fav_num,f)
with open(file_name) as f:
    num=json.load(f)
    print("I know your favorite number! It's "+num+".")

import json
def get_favnum():
    file_name="favnum.json"
    try:
        with open(file_name) as f:
            num=json.load(f)
    except FileNotFoundError:
        return None
    else:
        return num
def print_favnum():
    num=get_favnum()
    if num:    
        print("I know your favorite number! It's "+num+".")
    else:
        file_name="favnum.json"
        num=input("Enter your favorite number: ")
        with open(file_name,'w') as f:
            json.dump(num,f)
print_favnum()

import json
def get_sorted_user():
    '''获取存储的用户名'''
    file_name="username.json"
    try:
        with open(file_name) as f:
            user_name=json.load(f)
    except FileNotFoundError:
        return None
    else:
        return user_name
def get_new_user():
    '''获取新的用户名'''
    user_name=input("Enter your name: ")
    file_name="username.json"
    with open(file_name,'w') as f:
        json.dump(user_name,f)
    return user_name
def greet():
    '''问候用户并指出名字'''
    user=get_sorted_user()
    if user:
        print("Welcome "+user+"~")
        ask=input("Am I right? Enter 'y' or 'no': ")
        if ask=='y':
            pass
        elif ask=='n':
            user=get_new_user()
            print("Welcome "+user+"~")
    else:
        user=get_new_user()
        print("Welcome "+user+"~")
greet()