Head First Python 读书笔记

　　记录一下这段时间看《Head First Python》记录的一些小知识，只是记了很少一部分，有需要的话以后再添加吧。

if语句的使用:

• len() BIF会提供某个数据对象的长度，或集合的项数。
• isinstance() BIF会检查一个标识符是否为某个指定类型。
• 使用可选参数：　　def print_lol(the_list , level = 0)

下面附一些代码：

#code of open file
def get_coach_data(filename):
    try:
        with open(filename) as f:
            data = f.readline()
        temp = data.strip().split(‘,‘)
        return (AthleteList(temp.pop(0) , temp.pop(0) , temp)
    except IOError as e:
        print(‘File Error:‘ + str(e))
        return (None)

#code with great style
def top3(self):
    return (sorted(set([sanitize(i) for i in self]))[0:3])

#demo of pickle
import pickle
try:
    with open ("data.pickle" , ‘wb‘) as mysavedata:
        pickle.dump([1 , 2 , ‘three‘] , mysavedata)
except pickle.PickleError as e:
    print(‘File Error:‘ + str(e))

#demo of class
class AthleteList(list):
    det __init__(self , a_name , a_dob = None , a_times = []):
        self.name = a_name
        self.dob = a_dob
        self.extend(a_times)
    def top3(self):
        return (sorted(set([sanitize(i) for i in self]))[0:3])