python-文件操作3（读写文件的详细操作）

kezi 2021-08-16 原文

f=open(\'my-heart\',\'r\')
print(f.encoding)#返回字符编码
print(f.fileno())#返回操作系统的端口编号
print(f.seekable())#是否可以移动设备文件，一般二进制可以移动
print(f.writable())#是否可写
print(f.readable())#是否可读
print(f.flush())#刷新缓存内存到硬盘
print(dir(f.buffer))#


打印结果
-------------------------------------------------------------
cp936
3
True
False
True
None
[\'__class__\', \'__del__\', \'__delattr__\', \'__dict__\', \'__dir__\', \'__doc__\', \'__enter__\', \'__eq__\', \'__exit__\', \'__format__\', \'__ge__\', 

\'__getattribute__\', \'__getstate__\', \'__gt__\', \'__hash__\', \'__init__\', \'__iter__\', \'__le__\', \'__lt__\', \'__ne__\', \'__new__\', \'__next__\',
\'__reduce__\', \'__reduce_ex__\', \'__repr__\', \'__setattr__\', \'__sizeof__\', \'__str__\', \'__subclasshook__\', \'_checkClosed\', \'_checkReadable\',
\'_checkSeekable\', \'_checkWritable\', \'_dealloc_warn\', \'_finalizing\', \'close\', \'closed\', \'detach\', \'fileno\', \'flush\', \'isatty\', \'mode\', \'name\',
\'peek\', \'raw\', \'read\', \'read1\', \'readable\', \'readinto\', \'readinto1\', \'readline\', \'readlines\', \'seek\', \'seekable\', \'tell\', \'truncate\', 

\'writable\', \'write\', \'writelines\']

实实刷新

f=open(\'my-hert2\',\'w\')
f.write("hello 1\n")
f.write("hello 2\n")
f.flush()#刷新写到硬盘上
f.write("hello 3\n")

进度条的打印

import sys,time
for i  in range(80):
    sys.stdout.write("#")#屏幕上输出#
    sys.stdout.flush()#刷新输出
    time.sleep(0.1)

打印结果
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