零基础学python-9.2 文件
1.文件的操作：操作
解释
output=open(r'c:\123.txt','w')
创建输出文件，w写入
input=open('data','r')
创建输出文件，r读取
input=open('data')
创建输出文件，r默认
s=input.read()
整个文件读取单一字符串
s=input.read(N)
读取之后的n个字节到字符串
s=input.readline()
读取下一行到一个字符串
alist=input.readlines()
读取整个文件到字符串列表
output.write(s)
写入字节字符串到文件
output.writelines(list)
把列表内所有字符串写入文件
output.close()
手动关闭
output.flust()
清空缓存
anyFile.seek(N)
查询
for line in open('data'):use line
逐行读取
open('f.txt',encodeing='latin-1')
设置unicode
open('f.bin','rb')
2.基本操作实例
>>> myfile=open('123.txt','w')
>>> myfile.write
<built-in method write of _io.TextIOWrapper object at 0x012D8D30>
>>> myfile.write('hello world \n')
13
>>> myfile.write('hello world 2 \n')
15
>>> myfile.close ()
>>> myfile=open('123.txt')
>>> myfile.readline
<built-in method readline of _io.TextIOWrapper object at 0x0170B5B0>
>>> myfile.readline ()
'hello world \n'
>>> myfile.readline ()
'hello world 2 \n'
>>> myfile.readline ()
''
>>>
上面是读取、写入文件
3.只有字符串才能够写入文件
>>> myfile=open('123.txt','w')
>>> l=(1,2,3)
>>> myfile.write(l)
Traceback (most recent call last):
File "<pyshell#30>", line 1, in <module>
myfile.write(l)
TypeError: must be str, not tuple
>>>
>>> t=
>>> myfile.write(t)
Traceback (most recent call last):
File "<pyshell#35>", line 1, in <module>
myfile.write(t)
TypeError: must be str, not list
>>>
就说到这里，谢谢大家
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