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[Head First Python]4. summary

时间:2014-06-28 23:04:28      阅读:483      评论:0      收藏:0      [点我收藏+]

1- strip()方法可以从字符串去除不想要的空白符

(role, line_spoken) = each_line.split(":", 1)
line_spoken = line_spoken.strip()

2- print() BIF的file参数控制将数据发送/保存到哪里

print(...)
    print(value, ..., sep= , end=\n, file=sys.stdout, flush=False)
    
    Prints the values to a stream, or to sys.stdout by default.
    Optional keyword arguments:
    file:  a file-like object (stream); defaults to the current sys.stdout.
    sep:   string inserted between values, default a space.
    end:   string appended after the last value, default a newline.
    flush: whether to forcibly flush the stream.
if indent:
    for tab_stop in range(level):
        print("\t",end=‘‘, file = fn)
print(each_item, file = fn)

3- 会向except组传入一个异常对象,并使用as关键字赋至一个标示符

except IOError as err:
    print(file error + str(err))
except pickle.PickleError as perr:
    print(pickle err + str(perr))

4- str() BIF可以用来访问任何数据对象的串表示

5- locals() BIF返回当然作用域中的变量集合 

1 try:
2     data = open (missing)
3     print(data.read_line(),end = ‘‘)
4 except IOError as err:
5     print(file error + str(err))
6 finally:
7     if data in locals():
8         data.close()

 

1 try:
2     with open (missing.txt,w) as data:
3         print("this is test",file = data)
4 except IOError as err:
5     print(file error + str(err))

6- in 操作符用来检查成员关系

7- + 连接两个字符串

8- with 会自动处理所有已打开文件的关闭工作,即使出现异常也不例外, with也使用as关键字

9- sys.stdout 是python中"标准输出", 可以从标准库的sys模块访问

10- 标准库的pickle模块, 将python数据对象保存到磁盘及从磁盘恢复

11- pickle.dump() 函数将数据保存到磁盘

1 try:
2     with open(man.out, wb) as man_out, open(other.out,wb) as other_out:
3         pickle.dump(man, man_out) 
4         pickle.dump(other, other_out)

12- pickle.load() 函数从磁盘恢复数据

1 new_man = []
2 try:
3     with open(man.out, rb) as man_file:
4         new_man = pickle.load(man_file) 

 

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[Head First Python]4. summary

原文:http://www.cnblogs.com/galoishelley/p/3794270.html

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