初学python

#初学python：
#1.
##############################
from os.path import walk, join, normpath
import sys

if len(sys.argv) != 2:
    print 'input param error, like: add_str filepath'
    sys.exit(0)

debug_h='#include \"/dvr/debug/my_debug.h\"\n'

def add_str(file_c):
    f = file(file_c)
    all = f.readlines()
    f.close()

    print file_c, '---starting replace...'
    all.insert(0,debug_h)
    ff = file(file_c, 'w')
    for i in range(0, len(all)):
        ff.write(all)
    ff.close()
    print file_c, '---replace over...'
   

def visit(arg, dirname, names):
    files=[normpath(join(dirname, file)) for file in names]

    for i in range(0, len(files)):
        if files[-2:] in ['.h'] :
            add_str(files)
   
if __name__=="__main__":
    path=sys.argv[1]
    print 'Starting now...',path
    walk(path, visit, 0)
    print 'Completed....................'
###############################
#2.
from os.path import walk, join, normpath
import sys

if len(sys.argv) != 4:
    print 'input param error, like: replace filepath oldstr newstr'
    sys.exit(0)

old_str = sys.argv[2]
new_str = sys.argv[3]

def replace_c(file_c, old, new):
    f = file(file_c)
    all = f.readlines()
    f.close()

    print file_c, '---starting replace...'
    for i in range(0, len(all)):
        all = all.replace(old, new)

    ff = file(file_c, 'w')
    for i in range(0, len(all)):
        ff.write(all)
    ff.close()
    print file_c, '---replace over...'
   

def visit(arg, dirname, names):
    files=[normpath(join(dirname, file)) for file in names]

    for i in range(0, len(files)):
        if files[-2:] in ['.c', '.h'] :
            replace_c(files, old_str, new_str)
        if files[-4:] in ['.cpp', '.txt'] :
            replace_c(files, old_str, new_str)
   
if __name__=="__main__":
    path=sys.argv[1]
    print 'Starting now...',path
    walk(path, visit, 0)
    print 'Completed....................'