os.path.join合并 os.path.dirname返回上一级目录 os.path.exists(path) os.stat('path/filename')获取文件/目录信息

import os
str1 = "grsdgfd"
str2 = "wddf"
str3 = "gddgs"
# print(str1 + str2 + str3)
ret = os.path.join(str1,str2,str3)
print(ret)
结果:grsdgfdwddfgddgs

 os.path.dirname返回上一级目录相当于os.path.split(path)

import os
str1 = "grsdgfd"
str2 = "wddf"
str3 = "gddgs"
# print(str1 + str2 + str3)
ret = os.path.join(str1,str2,str3)
print(ret)
r = os.path.dirname(ret)
print(r)

结果：

C:Python35python3.exe F:/Python/json序列化/a2.py
grsdgfdwddfgddgs
grsdgfdwddf
Process finished with exit code 0

os.path.exists(path)如果path存在，返回True；如果path不存在，返回False

r = os.path.exists("C:Python35DLLs")
print(r)
结果：True

os.stat('path/filename')获取文件/目录信息

r = os.stat("C:Python35DLLs")
print(r)
结果：os.stat_result(st_mode=16895, st_ino=1688849860327555, st_dev=2351922400, st_nlink=1, st_uid=0, st_gid=0, 
st_size=4096, st_atime=1481069134, st_mtime=1481069134, st_ctime=1481069126)