head first python菜鸟学习笔记（第四章）

1，p124，错误：NameError: name 'print_lol' is not defined

要想文件内如图显示，需要把调用BIF print()改为调用第二章的nester模块中的print_lol()函数，因此需要导入nester模块。

首先需要修改第二章nester模块中的print_lol()函数并更新该模块，更新方法如图：

然后在sketch.py中调用print_lol()函数。

 1 '''
 2 修改时间：0919
 3 修改内容：把调用BIF print()改为调用第二章的nester模块中的print_lol()函数，需要导入nester模块
 4 '''
 5 import nester
 6 
 7 man=[]
 8 other=[]
 9 try:
10         data=open('sketch.txt')
11         for each_line in data:
12                 try:
13                         (role,line_spoken)=each_line.split(':',1)
14                         line_spoken=line_spoken.strip()
15                         if role=='Man':
16                                 man.append(line_spoken)
17                         elif role=='Other Man':
18                                 other.append(line_spoken)
19                 except ValueError:
20                         pass
21         data.close()
22 except IOError:
23         print('The datafile is missing!')
24 
25 try:
26         with open('man_data.txt','w') as man_file,open('other_data.txt','w') as other_file:
27                 print_lol(man,fh=man_file)
28                 print_lol(other,fh=other_file)
29 except IOError as err:
30         print('File Error:'+str(err))

这时会报错：

原因：

调用模块的函数时，格式为“模块名.函数名()”

因此代码更改为：

 1 '''
 2 修改时间：0919
 3 修改内容：把调用BIF print()改为调用第二章的nester模块中的print_lol()函数，需要导入nester模块
 4 注意：调用print_lol时，需要把模块名加上,nester.print_lol(),而不是直接调用print_lol().
 5 '''
 6 import nester
 7 
 8 man=[]
 9 other=[]
10 try:
11         data=open('sketch.txt')
12         for each_line in data:
13                 try:
14                         (role,line_spoken)=each_line.split(':',1)
15                         line_spoken=line_spoken.strip()
16                         if role=='Man':
17                                 man.append(line_spoken)
18                         elif role=='Other Man':
19                                 other.append(line_spoken)
20                 except ValueError:
21                         pass
22         data.close()
23 except IOError:
24         print('The datafile is missing!')
25 
26 try:
27         with open('man_data.txt','w') as man_file,open('other_data.txt','w') as other_file:
28                 nester.print_lol(man,fh=man_file)
29                 nester.print_lol(other,fh=other_file)
30 except IOError as err:
31         print('File Error:'+str(err))

 

 

2. pickle模块中dump()和load()的用法

dump()保存数据，load()恢复数据，即下载数据

try:
        with open('man_data.txt','wb') as man_file,open('other_data.txt','wb') as other_file:
                pickle.dump(man,man_file)
                pickle.dump(other,other_file)
except pickle.PickleError as perr:
        print('Pickling Error:'+str(perr))
import pickle
import nester
new_name=[]
try:
    with open('man_data.txt','rb')as man_file:
        new_name=pickle.load(man_file)
except IOError as err:
    print('File error:'+str(err))
except pickle.PickleError as perr:
    print('Pickling Error:'+str(perr))

    
nester.print_lol(new_name)

 

posted @ 2017-09-19 12:09  何不呤叮  阅读(488)  评论(0)  编辑  收藏  举报