Learning notes on python file operation

# File operations:

Read:

F = open ("/ Users/zhouhaijun/python/01.py", "r")

X = f.read ()

Print x

Write:

F = open ("/ Users/zhouhaijun/python/file_01.py", "wb")

F.write ("ok")

F.close ()

Read:

F = open ("/ Users/zhouhaijun/python/file_01", "r")

Text = f.read () # text = f.read

Print text

Read one line:

Print f.readline () # read by line

The next function is to copy the file, reading and writing fifty characters at a time. The first parameter is the source document name, and the second parameter is the new file name

Def copyFile (oldfile, newfile):

F1 = open (oldfile, "r")

F2 = open (newfile, "w")

While 1:

Text = f1.read (50)

If text = "":

Break

F2.write (text)

F1.close ()

F2.close ()

Return

The next example is a line processor, where the function filterFile copies a file and sets the old

Lines in the file that do not begin with "#" are written to the new file:

Def fileterFile (old, new):

Sfile = open (old, "r")

Dfile = open (new, "w")

While 1:

Text = sfile.readline ()

If text = "":

Break

Elif:

Text [0] = "#":

Continue

Else:

Dfile.write (text)

Sfile.close ()

Dfile.close ()