Python读写文件
Python读写文件
现在做CV又要开始用Python了,复习一下Python怎么读写文件23333
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读文件
fin=open('<the address of file>','r') #read the whole file theWholeFile=fin.read() #read a line aLine=fin.readline() fin.close()
如果要按字节读的话:
fin=open('<the address of file>','rb') try: while True: certainBytes=fin.read(20)#read 20 Bytes one time if not certainBytes:#如果读完了的话 break finally: fin.close()
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写文件
fout=open("<the address of file>",'w')
#wirte the whole text
fout.write(theWholeText)#remember if you want to write mutiple lines,please add \n by yourself
#write mutiple lines
fout.writelines(theListofLines)
#theListofLines looks like this:
#theListofLines = ["This is 6th line\n", "This is 7th line"]
fout.close()
写文件时候没有writeline方法,其实write手动在末尾加上换行符的话就是writeline,或者writekines的列表中只有一个元素也是
如果要追加写的话:
fout=open("<the address of file>",'w+')
如果要写二进制文件的话:
fout=open("<the address of file>",'wb')