Python 学习笔记四

接着三继续写http://www.cnblogs.com/dzzy/p/5295019.html

文件和函数操作：

from sys import argv
script,input_file=argv
def print_all(f):
    print f.read()
def rewind(f):
    f.seek(0)
def print_a_line(line_count,f):
    print line_count,f.readline()
 
current_file=open(input_file)
print_all(current_file)
print "Let's rewind"
rewind(current_file)
current_line=1
print_a_line(current_line,current_file)
current_line+1
print_a_line(current_line,current_file)
current_line+1
print_a_line(current_line,current_file)

class调用 注意init下划线是前后两个

class song(object):
    def __init__(self,lyrics):
        self.lyrics=lyrics
    def sing_me(self):
        for line in self.lyrics:
            print line
 
happy=song(["shit","sb",""])
happy.sing_me()