readlines()方法读取直到EOF，使用 readline()并返回包含行的列表。如果可选 sizehint 参数存在就不读取到EOF，全行共计约sizehint字节(四舍五入到内部缓冲区大小后)被读取。
当遇到EOF，一个空字符串被返回。
语法
下面是 readlines()方法的语法方法 -
fileObject.readlines( sizehint );
参数
-
sizehint -- 这是从文件中读取的字节数。
返回值
这个方法返回一个包含行的列表。
示例
下面的例子显示 readlines()方法的使用。
Assuming that 'foo.txt' file contains following text: This is 1st line This is 2nd line This is 3rd line This is 4th line This is 5th line
#!/usr/bin/python3
# Open a file
fo = open("foo.txt", "r+")
print ("Name of the file: ", fo.name)
line = fo.readlines()
print ("Read Line: %s" % (line))
line = fo.readlines(2)
print ("Read Line: %s" % (line))
# Close opened file
fo.close()
当我们运行上面的程序，会产生以下结果 -
Name of the file: foo.txt
Read Line: ['This is 1st line\n', 'This is 2nd line\n',
'This is 3rd line\n', 'This is 4th line\n',
'This is 5th line\n']
Read Line:
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