Python基础-文件处理

#r只读模式，w写入模式，a追加模式
file = open("1.txt","r")
#关闭文件
file.close()

Character Meaning
--------- ---------------------------------------------------------------
'r'       open for reading (default)
'w'       open for writing, truncating the file first
'x'       create a new file and open it for writing
'a'       open for writing, appending to the end of the file if it exists
'b'       binary mode
't'       text mode (default)
'+'       open a disk file for updating (reading and writing)
'U'       universal newline mode (deprecated)

#读取整个文件
file.read()

#读取文件前100个字符
file.read(100)

#按行读取文件
file.readline()

#读取所有行到一个列表中
file.readlines()

#写入文件
file.write('sadfasd')

#使用with语句打开文件，语句结束后会自动关闭文件
with open('1.txt') as file:
  for line in file:
    print(line)