Python批量重命名指定文件夹下文件的两种方法

#法一
import os
path = "C://Python34//"
for file in os.listdir(path):
if os.path.isfile(os.path.join(path,file))==True:
if file.find('.')<0:
newname=file+'.jpg'
os.rename(os.path.join(path,file),os.path.join(path,newname))

#法二
import os
import glob

path = "C://Python34//"
for infile in glob.glob( os.path.join(path, '*.gif') ):
for i in range (1,21):
index_symbol = "_" + str(i) + "_"
if index_symbol in infile:
newfile = infile
newfile = newfile.replace(index_symbol, str(i));
os.rename(infile, newfile)
print (infile)