Codeacademy Python-12-File Input/Output

在Codeacademy上学习Python课程，刷题的笔记记录如下，欢迎交流！

目录

1. Good Morning Class!

1.See it to Believe it

#以可写的方式打开output.txt，若没有则创建，然后写文件
my_list = [i**2 for i in range(1,11)]
# Generates a list of squares of the numbers 1 - 10

f = open("output.txt", "w")

for item in my_list:
    f.write(str(item) + "\n")

f.close()

2.The open() Function

# "r+" = the file will allow you to read and write to it! 
my_file = open("output.txt","r+")

3.Writing

my_list = [i**2 for i in range(1,11)]
# Generates a list of squares of the numbers 1 - 10

my_file = open("output.txt", "w")

for item in my_list:
    my_file.write(str(item) + "\n")

my_file.close()

4.Reading

my_file =open("output.txt","r")
print my_file.read()
my_file.close()

2. The Devil’s in the Details

5.Reading Between the Lines

#按行读取，一次一行
my_file = open("text.txt", "r")
print my_file.readline()
print my_file.readline()
print my_file.readline()

my_file.close()

6. PSA: Buffering Data

#
# Open the file for reading
read_file = open("text.txt", "r")

# Use a second file handler to open the file for writing
write_file = open("text.txt", "w")
# Write to the file
write_file.write("Not closing files is VERY BAD.")

write_file.close()

7. Sending a Letter

#with ... as ... 操作 
with open("text.txt", "w") as textfile:
    textfile.write("Success!")

8.Try It Yourself

with open("text.txt","w") as my_file:
    my_file.write("Write a word!")

9.Case Closed?

#如果没有关闭，则关闭
with open("text.txt","w") as my_file:
    my_file.write("Write a word!")
if my_file.closed == False:
    my_file.close()
print my_file.closed