Python:读文件和写文件

1. 写文件

#! /usr/bin/python3

'makeTextFile.py -- create text file'

import os

def write_file():
    "used to write a text file."
    
    ls = os.linesep
    #get filename
    fname = input("Please input filename:")

    while True:
    
        if os.path.exists(fname):
            print("Error: '%s' already exists" % fname)
            fname = input("Please input filename:")
        else:
            break
        
    #get file conent linesOnScreen
    all = []
    print("\nEnter lines ('.' to quit).\n")

    while True:
        entry = input('>')
        if entry == '.':
            break
        else:
            all.append(entry)
            
    try:
        fobj = open(fname,  'w')
    except IOError as err:
        print('file open error: {0}'.format(err))  
        
    fobj.writelines(['%s%s' % (x,  ls) for x in all])
    fobj.close()
    
    print('WRITE FILE DONE!')
    
    return fname

2. 读文件

#! /usr/bin/python3

'readTextFile.py -- read and display text file.'

def read_file(filename):
    'used to read a text file.'
    
    try:
        fobj = open(filename,  'r')
    except IOError as err:
        print('file open error: {0}'.format(err))  
    else:
        for eachLine in fobj:
            print(eachLine)
        fobj.close()

3. 主程序

#! /usr/bin/python3

'write_and_read_file.py -- write and read text file.'

import makeTextFile
import readTextFile

if __name__ == '__main__':
    
    #wrie file
    filename = makeTextFile.write_file()
    
    #read file
    readTextFile.read_file(filename)

4.运行结果

Python 3.2.2 (default, Sep  4 2011, 09:51:08) [MSC v.1500 32 bit (Intel)] on winxp-duanyx, Standard
>>> Please input filename:d:\testpython.log

Enter lines ('.' to quit).

>this is a test file.
>ok ,let us input . to end the content input.
>.
WRITE FILE DONE!
this is a test file.



ok ,let us input . to end the content input.




>>>

来源：https://www.cnblogs.com/dyx1024/archive/2012/01/08/2556717.html

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