Python读写文件，,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

读文件

fin=open('<the address of file>','r')#read the whole filetheWholeFile=fin.read()#read a lineaLine=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            breakfinally:    fin.close()

写文件

fout=open("<the address of file>",'w')#wirte the whole textfout.write(theWholeText)#remember if you want to write mutiple lines,please add \n by yourself#write mutiple linesfout.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')

Python读写文件