python3 文件操作

只读/读取：

>>> re = open(r'C:\Users\Administrator\Desktop\z.txt',mode = 'r',encoding = 'utf-8')       #文件路径可以是绝对路径，也可以是相对的，在复制路径时，注意开头的控制字符，路径前记得加R
>>> cont = re.read()
>>> cont
'\ufeffeuwyib\neswqdwqed\ndwedwe\ngerg\nerwgwtrg\nhth\nrhgrt\nhg'
>>> print(cont)
euwyib
eswqdwqed
dwedwe
gerg
erwgwtrg
hth
rhgrt
hg
>>> re.close()





#以bytes类型读取
>>> re.close()
>>> re = open(r'C:\Users\Administrator\Desktop\z.txt',mode = 'rb')
>>> cont = re.read()
>>> cont
b'\xef\xbb\xbfeuwyib\r\neswqdwqed\r\ndwedwe\r\ngerg\r\nerwgwtrg\r\nhth\r\nrhgrt\r\nhg'
>>> print(cont)
b'\xef\xbb\xbfeuwyib\r\neswqdwqed\r\ndwedwe\r\ngerg\r\nerwgwtrg\r\nhth\r\nrhgrt\r\nhg'
>>> re.close()

 

 

文件写入：

>>> wr = open(r'E:\zero.txt',mode = 'w',encoding = 'utf-8')
>>> wr.write('嘻嘻哈哈')
4
>>> wr.close()
>>> wr = open(r'E:\zero.txt',mode = 'r',encoding = 'utf-8')
>>> cont = wr.read()
>>> cont
'嘻嘻哈哈'



>>> wr = open(r'E:\zero.txt',mode = 'wb')
>>> wr.write('知易行难'.encode('UTF-8'))
12
>>> wr.close()
>>> re = open(r'E:\zero.txt',mode = 'r+b')
>>> cont = re.read()
>>> cont
b'\xe7\x9f\xa5\xe6\x98\x93\xe8\xa1\x8c\xe9\x9a\xbe'

 

 

同时读写：

#先读后写

>>> re = open(r'E:\zero.txt',mode = 'r+',encoding = 'utf-8')
>>> f = re.read()
>>> f
'知易行难'
>>> re.write('哈哈哈哈哈')
5
>>> re.close()

>>> re = open(r'E:\zero.txt',mode = 'r',encoding = 'utf-8')
>>> f = re.read()
>>> f
'知易行难哈哈哈哈哈'




#先写后读
>>> re = open(r'E:\zero.txt',mode = 'r+',encoding = 'utf-8')
>>> re.write('哈哈哈哈哈')
5
>>> re.read()
'哈哈哈哈'
>>> re.close()



#bytes类型读写
>>> re = open(r'E:\zero.txt',mode = 'r+b')
>>> re.read()
b'\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88'
>>> re.write('哈哈哈哈哈'.encode('utf-8'))
15

>>> re.close()
>>> re = open(r'E:\zero.txt',mode = 'r',encoding = 'utf-8')
>>> re.read()
'哈哈哈哈哈哈哈哈哈哈哈哈哈哈'
>>> re.close()

>>> re = open(r'E:\zero.txt',mode = 'r+b')
>>> re.read()
b'\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88\xe5\x93\x88'
>>> re.close()

 

 

写读：

>>> re = open(r'E:\zero.txt',mode = 'w+',encoding = 'utf-8')
>>> re.write('知易行难')
4
>>> re.read()  
''
>>> re.tell()             #输出光标位置
12
>>> re.seek(0)            #调整光标位置
0
>>> re.read()
'知易行难'
>>> re.seek(0)
0
>>> re.read(2)
'知易'
>>> re.seek(0)
0
>>> re.read(3)
'知易行'
>>> re.close()

 

 

文件重命名：

>>> re = open(r'E:\zero.txt',mode = 'r',encoding = 'utf-8')

>>> re.read()
'知易行难'
>>> re.close()

>>> import os
>>> os.rename(r'E:\zero.txt',r'E:\zero1.txt')

>>> re = open(r'E:\zero.txt',mode = 'r',encoding = 'utf-8')
Traceback (most recent call last):
  File "", line 1, in 
    re = open(r'E:\zero.txt',mode = 'r',encoding = 'utf-8')
FileNotFoundError: [Errno 2] No such file or directory: 'E:\\zero.txt'

>>> re = open(r'E:\zero1.txt',mode = 'r',encoding = 'utf-8')
>>> re.read()
'知易行难'
>>> re.close()

 

 

文件删除：

>>> re = open(r'E:\zero.txt',mode = 'r',encoding = 'utf-8')

>>> re.read()
'知易行难'
>>> re.close()

>>> import os
>>> os.remove(r'E:\zero.txt')

>>> re = open(r'E:\zero.txt',mode = 'r',encoding = 'utf-8')
Traceback (most recent call last):
  File "", line 1, in 
    re = open(r'E:\zero.txt',mode = 'r',encoding = 'utf-8')
FileNotFoundError: [Errno 2] No such file or directory: 'E:\\zero.txt'