文件处理file handling

#1. 打开文件，得到文件句柄并赋值给一个变量
#2. 通过句柄对文件进行操作
#3. 关闭文件

#!/user/bin/python
# -*- coding:utf-8 -*-
#1、open函数打开文件，open找的是系统的编码gbk
f = open("陈粒",encoding="utf-8") #打开文件指定编码
data = f.read() #读的模式
print(data)
f.close()   #关闭文件
f = open("xxx")
data = f.read()
print(data)
f.close()
#2、r是读的方式,readable是判断是否可读
f = open("陈粒","r",encoding="utf-8")
print(f.readable()) #
#3、readline默认一次读取一行
f = open("陈粒",encoding="utf-8")
print("第一行",f.readline(),end="")
print("第二行",f.readline(),end="")
print("第三行",f.readline(),end="")
print("第四行",f.readline(),end="")
print("第五行",f.readline(),end="")
print("第六行",f.readline(),end="")
print("第七行",f.readline(),end="")
f.close()
print("读的模式已结束")
#4、写模式只能写不能读、读模式只能读不能写
#5、w模式是把文件内容清空掉再执行操作如果文件不存在的话再重新新建一个文件
f = open("陈粒1","w",encoding="utf-8")
f.write("11111\n")
f.write("22222\n")
f.write("33333\n")
f.write("44444\n")  #\n回车加换行
f.writelines(["555\n","666\n"])
f.close()
print("写的模式已结束")
#6、writable判断是否可写
#7、writelines写入行
#8、追加模式用a
f = open("陈粒1","a",encoding="utf-8")
f.write("写到最后")
f.close()
print("追加模式已结束了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了了")
#9、r+读写模式
f = open("xxx","r+",encoding="utf-8")
data = f.read()
print(data)
f.write("123")
f.close()
#10、r读的方式打开文件，w写的方式到新文件
src_f = open("xxx","r",encoding= "utf-8")
data = src_f.readlines()
src_f.close()
print(data)
dst_f = open("xxx_new","w",encoding="utf-8")
dst_f.write(data[0])
dst_f.close()
#11、with用法一：
with open("a.txt","w") as f:
    f.write("1111\n")
#12、with用法二：
# src_f = open("xxx","r",encoding="utf-8")
# dst_f = open("xxx","w",encoding="utf-8")
with open("xxx","r",encoding="utf-8") as src_f,\
        open("xxx_new","w",encoding="utf-8") as dst_f:
    data = src_f.read()
    dst_f.write(data)