python 文件操作复习一
print "当前路径：" print os.getcwd()print "判断是否是一个文件："
print os.path.isfile(os.getcwd())
print "是否是一个目录："
print os.path.isdir(os.getcwd())
print os.system("ls")
print "判断是否是绝对路径："
print os.path.isabs("excp01.py")
print "检验给出的路径是否真地存:"
print os.path.exists("/Users/zhouhaijun")
print "返回一个路径的目录名和文件名"
print os.path.split("/Users/zhouhaijun")
print "分离文件名与扩展名"
print os.path.splitext("tmp1.dat")
print "找出某个目录下所有的文件，并在每个文件中写入“osTest”"
for root,dis,files in os.walk("/Users/zhouhaijun/Desktop/hhhhh/osTest"):
for name in files:
print name,root,os.path.join(root,name)
with open(os.path.join(root,name),"w") as fp:
fp.write("good! liwen \n 学习walk"
"命令")
print "ok!"
print "如果某个目录下文件名包含dat后缀名，则把文件后面追加写一行“被我找到了！"
for root,dirs,files in os.walk("/Users/zhouhaijun/Desktop/hhhhh/osTest"):
for name in files:
suffix = os.path.splitext(os.path.join(root,name))[-1]
if suffix in "dat":
print name
with open(os.path.join(root,name),"a") as fp:
fp.write("\n我找到了！！！")
print "修改内容："
os.system("cd /Users/zhouhaijun/Desktop/hhhhh/osTest")
print "获取当前路径"
os.chdir("/Users/zhouhaijun/Desktop/hhhhh/osTest")
print "获取当前目录："
print os.getcwd()
for line in fileinput.input("dd",inplace = 1):
line = line.replace("walk","\n复习fileinput.input命令")
print line
print "seek函数："
with open("dd","r+") as f:
old = f.read()
print "内容是：",old
f.seek(2)
f.write("liwen is very googd!!!!")
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