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【python】IO系列

2024-09-20 22:45:36   218人阅读

1. 文件IO

1.1 file read

样本C:\FILE\ifconfig.txt

root@webserver1 test# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:50:56:A2:14:55  
          inet addr:10.180.137.68  Bcast:10.180.255.255  Mask:255.255.0.0
          inet6 addr: fe80::250:56ff:fea2:1455/64 Scope:Link
file.readline([size])
读取指定size bytes的整行，返回字符串
with open("C:\FILE\ifconfig.txt") as f:
    print f.name   
    print repr(f.readline())




执行结果




C:\Python27\python.exe C:/PycharmProjects/p3/src/pyproject1/iotest/fileIOtest.py
C:\FILE\ifconfig.txt
‘[root@webserver1 test]# ifconfig\n‘




file.read([size])


 


读取指定size bytes的所有直到EOF，返回字符串


 


 




with open("C:\FILE\ifconfig.txt") as f:
    print f.name
    print repr(f.read())    




 


运行结果




C:\Python27\python.exe C:/PycharmProjects/p3/src/pyproject1/iotest/fileIOtest.py
C:\FILE\ifconfig.txt
‘root@webserver1 test# ifconfig\neth0      Link encap:Ethernet  HWaddr 00:50:56:A2:14:55  \n          inet addr:10.180.137.68  Bcast:10.180.255.255  Mask:255.255.0.0\n          inet6 addr: fe80::250:56ff:fea2:1455/64 Scope:Link\n ‘

Process finished with exit code 0




file.readlines([sizehint])


 


读取指定size bytes的所有直到EOF，返回每行构成的list




with open("C:\FILE\ifconfig.txt") as f:
    print f.name
    print repr(f.readlines())




运行结果




C:\Python27\python.exe C:/PycharmProjects/p3/src/pyproject1/iotest/fileIOtest.py
C:\FILE\ifconfig.txt
[‘root@webserver1 test# ifconfig\n‘, ‘eth0      Link encap:Ethernet  HWaddr 00:50:56:A2:14:55  \n‘, ‘          inet addr:10.180.137.68  Bcast:10.180.255.255  Mask:255.255.0.0\n‘, ‘          inet6 addr: fe80::250:56ff:fea2:1455/64 Scope:Link\n‘, ‘ ‘]




1.2 file write 


Unix/Linux系统里，每行结尾只有“<换行>”，即“\n”;


Windows系统里面，每行结尾是“<回车><换行>”，即“\r\n”;


Mac系统里，每行的结尾是“"<回车>”,即“\r”


file.write(str)




f = open("C:\FILE\ifconfig2.txt", ‘w+‘)
f.write("foooo" + "\n")
f.write("barr")
f.close()




C:\FILE\ifconfig2.txt




foooo
barr




file.writelines(sequence)


 




f = open("C:\FILE\ifconfig2.txt", ‘w+‘)
towrite = ["ffffffoooo\n","barbarbar\n","foobarfoobar"]
f.writelines(towrite)
f.close()




 


C:\FILE\ifconfig2.txt




ffffffoooo
barbarbar
foobarfoobar




 
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