- 1.open使用open打开文件后一定要记得调用文件对象的close()方法。比如可以用try/finally语句来确保最后能关闭文件。
- file_object = open('thefile.txt')
- try:
- all_the_text = file_object.read( )
- finally:
- file_object.close( )
- 注:不能把open语句放在try块里,因为当打开文件出现异常时,文件对象file_object无法执行close()方法。
- 2.读文件读文本文件input = open('data', 'r')
- #第二个参数默认为r
- input = open('data')
-
- 读二进制文件input = open('data', 'rb')
- 读取所有内容file_object = open('thefile.txt')
- try:
- all_the_text = file_object.read( )
- finally:
- file_object.close( )
- 读固定字节file_object = open('abinfile', 'rb')
- try:
- while True:
- chunk = file_object.read(100)
- if not chunk:
- break
- do_something_with(chunk)
- finally:
- file_object.close( )
- 读每行list_of_all_the_lines = file_object.readlines( )
- 如果文件是文本文件,还可以直接遍历文件对象获取每行:
- for line in file_object:
- process line
- 3.写文件写文本文件output = open('data.txt', 'w')
- 写二进制文件output = open('data.txt', 'wb')
- 追加写文件output = open('data.txt', 'a')
-
- output .write("\n都有是好人")
-
- output .close( )
-
- 写数据file_object = open('thefile.txt', 'w')
- file_object.write(all_the_text)
- file_object.close( )
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