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10-3
name=input("输入你的名字：")
with open('guest.txt','a') as file_object:
?? ?file_object.write('\n'+name)
10-4
while True:
?? ?message=input("输入你的名字：\n输入q退出。")
?? ?if message=='q':
?? ??? ?break
?? ?print(f"Hello, {message.title()}!")
?? ?with open('guest_book.txt','a') as file_object:
?? ??? ?file_object.write(message+"\n")
10-5
while True:
?? ?reason=input("Why do you love code?\nEnter 'q' to exit.")
?? ?if reason=='q':
?? ??? ?break
?? ?with open('reasons.txt','a') as file_object:
?? ??? ?file_object.write(reason+'\n')
10-6
try:
? ? a = int(input('Please input first number: '))
? ? b = int(input('Please input second number: '))
except ValueError:
? ? print('You should input number.')
else:
? ? print(a + b)
10-7
while True:
? ? try:
? ? ? ? a = int(input('Please input first number: '))
? ? except ValueError:
? ? ? ? print('You should input number.')
? ? else:
? ? ? ? break
while True:
? ? try:
? ? ? ? b = int(input('Please input second number: '))
? ? except ValueError:
? ? ? ? print('You should input number.')
? ? else:
? ? ? ? break
print(a + b)
10-8
filename='cats.txt'
with open(filename) as f:
?? ?contents=f.read()
?? ?print(contents)
filename='dogs.txt'
try:
?? ?with open(filename) as f:
?? ??? ?contents=f.read()
?? ??? ?
except FileNotFoundError:
?? ?print("没找到。")
else:
?? ?print(contents)
10-9
filename='dogs.txt'
try:
?? ?with open(filename) as f:
?? ??? ?contents=f.read()
?? ??? ?
except FileNotFoundError:
?? ?pass
else:
?? ?print(contents)
10-10
filename='earth_song.txt'
with open(filename) as f:
?? ?contents=f.read()
?? ?i=contents.lower().count("what ")
?? ?print(i)
def count_word(filename):
?? ?with open(filename) as f:
?? ??? ?contents=f.read()
?? ??? ?i=contents.lower().count("the")
?? ??? ?print(f"{filename}有{i}个'the'。")
filenames=['earth_song.txt','billie_jean.txt']
for filename in filenames:
?? ?count_word(filename)
10-11
(10-11-1.py)
import json
number=input("What is your favorite number?")
filename ='number.json'
with open(filename,'w') as f:
?? ?json.dump(number,f)
?? ?print("Alright!")
(10-11-2.py)
import json
filename='number.json'
with open(filename) as f:
?? ?number=json.load(f)
?? ?print(f"I know your favorite number!It's {number}!")
10-12
import json
filename='number.json'
try:
?? ?with open(filename) as f:
?? ??? ?number=json.load(f)
except FileNotFoundError:
?? ?number=input("What is your favorite number?")
?? ?with open(filename,'w') as f:
?? ??? ?json.dump(number,f)
?? ??? ?print("Alright!")
else:
?? ?print(f"I know your favorite number!It's {number}!")
10-13
import json
def get_stored_username():
?? ?filename='username.json'
?? ?try:
?? ??? ?with open(filename) as f:
?? ??? ??? ?username=json.load(f)
?? ?except FileNotFoundError:
?? ??? ?return None
?? ?else:
?? ??? ?return username
def get_new_username():
?? ?username=input("What is your name?")
?? ?filename='username.json'
?? ?with open(filename,'w') as f:
?? ??? ?json.dump(username,f)
?? ?return username
def greet_user():
?? ?username=get_stored_username()
?? ?if username:
?? ??? ?message=input("Is this your username?"+username+"(Please enter 'yes'/'no'.)")
?? ??? ?if message=="yes":
?? ??? ??? ?print(f"Welcome back, {username}!")
?? ??? ?else:
?? ??? ??? ?username=get_new_username()
?? ??? ??? ?print(f"We'll remember you when you come back, {username}!")
?? ?else:
?? ??? ?username=get_new_username()
?? ??? ?print(f"We'll remember you when you come back, {username}!")
?? ??? ?
greet_user()
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