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。

 '''
 修改时间：0919
 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
 '''
 import nester

 man=[]
 other=[]
 try:
         data=open('sketch.txt')
         for each_line in data:
                 try:
                         (role,line_spoken)=each_line.split(':',1)
                         line_spoken=line_spoken.strip()
                         if role=='Man':
                                 man.append(line_spoken)
                         elif role=='Other Man':
                                 other.append(line_spoken)
                 except ValueError:
                         pass
         data.close()
 except IOError:
         print('The datafile is missing!')

 try:
         with open('man_data.txt','w') as man_file,open('other_data.txt','w') as other_file:
                 print_lol(man,fh=man_file)
                 print_lol(other,fh=other_file)
 except IOError as err:
         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：

 '''
 修改时间：0919
 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
 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().
 '''
 import nester

 man=[]
 other=[]
 try:
         data=open('sketch.txt')
         for each_line in data:
                 try:
                         (role,line_spoken)=each_line.split(':',1)
                         line_spoken=line_spoken.strip()
                         if role=='Man':
                                 man.append(line_spoken)
                         elif role=='Other Man':
                                 other.append(line_spoken)
                 except ValueError:
                         pass
         data.close()
 except IOError:
         print('The datafile is missing!')

 try:
         with open('man_data.txt','w') as man_file,open('other_data.txt','w') as other_file:
                 nester.print_lol(man,fh=man_file)
                 nester.print_lol(other,fh=other_file)
 except IOError as err:
         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)