文件操作及os模块

import os,stat
#打开不存在的文件
file1 = open("./Anna.txt","w",encoding='utf-8')
file1.close()

file1 = open("./Anna1.txt","a",encoding='utf-8')
file1.close()

file1 = open("./Anna2.txt","a+",encoding='utf-8')
file1.close()

file1 = open("./Anna3.txt","w+",encoding='utf-8')
file1.close()

#总结:
    #创建文件有4种方式，w,w+,a,a+
    #使用w和w+方式新建文件如果文件存在则会覆盖原所有内容
    #使用a,a+如果文件存在不会覆盖内容
    #open()函数打开文件后必须要使用close()关闭，如果文件不存在，新建文件不需要关闭该文件

file1 = open("./Anna4.txt","w",encoding='utf-8')
file1.writelines("第一行
第二行")
file1.close()

file1 = open("./Anna4.txt","r+",encoding='utf-8')
print(file1.read(3)) #读取指定的值
file1.seek(0,0)#指针偏移量,0 文件开头,1  当前位置,2   文件末尾
print(file1.readline())#一行一行的读取
print("当前指针的位置",file1.tell())
file1.seek(0,0)
print(file1.readlines())#读取文件的所有内容，返回到一个列表中
file1.seek(0,0)
print(file1.readlines()[1])#读取某一行数据
file1.close()

#with方法，不需要关闭文件
with open("./Anna4.txt","r",encoding='utf-8') as file2:
    res = file2.readlines()
    print(res)

#os模块
try:
    os.mkdir(r"C:UsersAdministratorDesktopAnna6")
except FileExistsError as e:
    print("[WinError 183] 当文件已存在时，无法创建该文件",e)

path1 = 'C:\UsersAdministratorDesktopAnna6'

if os.path.exists(path1):
    os.renames('C:\UsersAdministratorDesktopAnna6','C:\UsersAdministratorDesktopAnna7')
    print("has rename the path")
    os.rmdir('C:\UsersAdministratorDesktopAnna7') #删除非空目录
    print("has deled the rename file")
else:
    print("path not exist")

res = os.access("./Anna4.txt",os.F_OK)#文件是否存在
print(res)
print(os.access("./Anna4.txt",os.R_OK))#可读
print(os.access("./Anna4.txt",os.W_OK))#可写
print(os.access("./Anna4.txt",os.X_OK))#可执行

print('目录和文件拼接路径：',os.path.join(r':UsersAdministratorDesktopGaara.txt','Narodo.txt'))
print(os.path.split(r':UsersAdministratorDesktopGaara.txt'),type(os.path.split(r':UsersAdministratorDesktopGaara.txt')))

os.chmod(r'C:UsersAdministratorDesktopGaara.txt',stat.S_IREAD)

# stat.S_ISUID: Set user ID on execution.                      不常用
# stat.S_ISGID: Set group ID on execution.                    不常用
# stat.S_ENFMT: Record locking enforced.                       不常用
# stat.S_ISVTX: Save text image after execution.               在执行之后保存文字和图片
# stat.S_IREAD: Read by owner.                                  对于拥有者读的权限
# stat.S_IWRITE: Write by owner.                                 对于拥有者写的权限
# stat.S_IEXEC: Execute by owner.                                对于拥有者执行的权限
# stat.S_IRWXU: Read, write, and execute by owner.               对于拥有者读写执行的权限
# stat.S_IRUSR: Read by owner.                                    对于拥有者读的权限
# stat.S_IWUSR: Write by owner.                                    对于拥有者写的权限
# stat.S_IXUSR: Execute by owner.                                 对于拥有者执行的权限
# stat.S_IRWXG: Read, write, and execute by group.                 对于同组的人读写执行的权限
# stat.S_IRGRP: Read by group.                                      对于同组读的权限
# stat.S_IWGRP: Write by group.                                      对于同组写的权限
# stat.S_IXGRP: Execute by group.                                    对于同组执行的权限
# stat.S_IRWXO: Read, write, and execute by others.                  对于其他组读写执行的权限
# stat.S_IROTH: Read by others.                                       对于其他组读的权限
# stat.S_IWOTH: Write by others.                                      对于其他组写的权限
# stat.S_IXOTH: Execute by others.                                    对于其他组执行的权限