与小卡特一起学python 第22章 文件输入与输出

#22-1 打开和读文件
my_file = open('notes.txt','r')
lines = my_file.readlines()
print(lines)
my_file.close()


#22-2 多次使用readline()
my_file = open('notes.txt','r')
first_line = my_file.readline()
second_line = my_file.readline()
print("first line = ",first_line)
print("second line = ",second_line)
my_file.close()


#22-21 seek()
my_file = open('notes.txt','r')
first_line = my_file.readline()
second_line = my_file.readline()
print("first line = ",first_line)
print("second line = ",second_line)
my_file.seek(5)
first_line_again = my_file.readline()
print(first_line_again)
my_file.close()


#22-3使用追加模式

todo_list = open("notes.txt","a")
todo_list.write ("\nSpeed allowance")
todo_list.close()

#22-4 对一个新文件使用写模式
new_file = open("my_new_notes.txt","w")
new_file.write("Eat supper\n")
new_file.write("Play soccer\n")
new_file.write("Go to bed")
new_file.close()

#22-5 对一个现有文件使用写模式
the_file = open("notes.txt","w")
the_file.write("Wake up\n")
the_file.write("Watch cartoons")
the_file.close()

my_file = open('notes.txt','r')
lines = my_file.readlines()
print(lines)
my_file.close()

#22-6 使用pickle将列表存储到文件中
import pickle
my_list = ['Fred',73,'Hello there',8.19876e-13]
pickle_file = open('my_pickled_list.pkl','wb')#wb二进制存储 与书中不一样
pickle.dump(my_list,pickle_file,1)
pickle_file.close()


#22-7 使用load()还原
import pickle
pickle_file = open('my_pickled_list.pkl','rb')#二进制打开
recovered_list = pickle.load(pickle_file)
pickle_file.close()
print(recovered_list)

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转载于:http://blog.itpub.net/220205/viewspace-2088972/