从零学python系列之从文件读取和保存数据

>>> import os
>>> os.getcwd()    #查看当前工作目录
'C:\\Python33'
>>> os.chdir('C:/Python33/HeadFirstPython/chapter3')   #切换包含数据文件的文件夹
>>> os.getcwd()     #查看切换后的工作目录
'C:\\Python33\\HeadFirstPython\\chapter3'

>>> data=open('sketch.txt')
>>> print(data.readline(),end='')
Man: Is this the right room for an argument?
>>> print(data.readline(),end='')
Other Man: I've told you once.

>>> data.seek(0)   #使用seek()方法回到文件起始位置
>>> for each_line in data:
    print(each_line,end='')

   
Man: Is this the right room for an argument?
Other Man: I've told you once.
Man: No you haven't!
Other Man: Yes I have.
Man: When?
Other Man: Just now.
Man: No you didn't!
Other Man: Yes I did!
Man: You didn't!
Other Man: I'm telling you, I did!
Man: You did not!
Other Man: Oh I'm sorry, is this a five minute argument, or the full half hour?
Man: Ah! (taking out his wallet and paying) Just the five minutes.
Other Man: Just the five minutes. Thank you.
Other Man: Anyway, I did.
Man: You most certainly did not!
Other Man: Now let's get one thing quite clear: I most definitely told you!
Man: Oh no you didn't!
Other Man: Oh yes I did!
Man: Oh no you didn't!
Other Man: Oh yes I did!
Man: Oh look, this isn't an argument!
(pause)
Other Man: Yes it is!
Man: No it isn't!
(pause)
Man: It's just contradiction!
Other Man: No it isn't!
Man: It IS!
Other Man: It is NOT!
Man: You just contradicted me!
Other Man: No I didn't!
Man: You DID!
Other Man: No no no!
Man: You did just then!
Other Man: Nonsense!
Man: (exasperated) Oh, this is futile!!
(pause)
Other Man: No it isn't!
Man: Yes it is!
>>> data.close()

import os
print(os.getcwd())
os.chdir('C:\Python33\HeadFirstPython\chapter3')
man=[]    #定义列表man接收Man的内容
other=[]  #定义列表other接收Other Man的内容

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!')
print (man)
print (other)

import os
print(os.getcwd())
os.chdir('C:\Python33\HeadFirstPython\chapter3')
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:
    man_file=open('man.txt', 'w')      #以w模式访问文件man.txt
    other_file=open('other.txt','w')   #以w模式访问文件other.txt
    print (man, file=man_file)           #将列表man的内容写到文件中
    print (other, file=other_file)
except IOError:
    print ('File error')
finally:
    man_file.close()
    other_file.close()