这种方法读取直到EOF的使用readline()返回一个列表，其中包含的行。如果可选sizehint参数是存在的，而不是读取到EOF，全行共约sizehint字节读取（可能后四舍五入到内部缓冲区的大小）.

语法:
fileObject.readlines( sizehint );
参数:
以下是详细的参数:

sizehint: 这是从文件中读取的字节数.
实例:
#!/usr/bin/python

# Open a file
fo = open("foo.txt", "r")
print "Name of the file: ", fo.name

# Assuming file has following 5 lines
# This is 1st line
# This is 2nd line
# This is 3rd line
# This is 4th line
# This is 5th line

line = fo.readlines()
print "Read Line: %s" % (line)

line = fo.readlines(2)
print "Read Line: %s" % (line)

# Close opend file
fo.close()
这将产生以下结果:

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: []

中谷Python