python编程：从入门到实践-第十章练习

#10-1

with open('learning_python.txt') as lp:

l1 = lp.read()

print(l1)

for i in lp:

print(i)

l2 = lp.readlines()

for i in l2:

print(i.strip())

for i in l2: #10-2

i1 = i.replace('Python','Go')

print(i1)

#10-3

name = input('your name')

with open('name.txt','a') as fn:

fn.write(name)

#10-4

while(True):

name = input('your name:')

print('hello',name)

with open('guest_book.txt','a') as gn:

gn.write(name)

#10-5

while(True):

why = input('why you like coding?')

with open('because.txt','a') as wn:

wn.write(why)

import math

#10-6

a = input('number:')

b = input('number:')

try:

a=int(a)

b=int(b)

except ValueError:

print('please give me number!')

else:

c=a+b

#10-7

while(True):

a = input('number:')

b = input('number:')

try:

a=int(a)

b=int(b)

except ValueError:

print('please give me number!')

else:

c=a+b

#10-8

try:

with open('cat.txt') as cr:

cat = cr.read()

with open('dog.txt') as dr:

dog = dr.read()

except FileNotFoundError:

print('file not found!')

else:

print(cat)

print(dog)

#10-9

try:

with open('cat.txt') as cr:

cat = cr.read()

with open('dog.txt') as dr:

dog = dr.read()

except FileNotFoundError:

pass

else:

print(cat)

print(dog)

#10-10

try:

with open('my_book.txt') as book:

b = book.read()

except FileNotFoundError:

print('no book!')

else:

c = b.count('the')

print(c)

#10-11

import json

number = int(input('your favorite number:'))

with open('number.txt','a') as n:

json.dump(number,n)

with open('number.txt') as r:

number=json.load(r)

print(number)

#10-12

try:

with open('number.txt') as num:

number = num.read()

except FileNotFoundError:

number = int(input('your favorite number:'))

with open('number.txt','a')as wr:

json.dump(number,wr)

print(number)

else:

print(number)