43-练习：生成文本文件

import os

def get_fname():
    while True:
        fname = input('filename: ')
        if not os.path.exists(fname):
            break
        print('%s already exists. Try again' % fname)

        return fname

def get_content():
    content = []
    print('输入数据，输入end结束')
    while True:
        line = input('>')
        if line == 'end':
            break
        content.append(line)

    return content

def wfile(fname,content):
    with open(fname, 'w') as fobj:
        fobj.write(content)

if __name__ ==  '__manin__':
    fname = get_fname()
    content = get_content()
    content = ['%s\n' % line for line in content]
    wfile(fname,content)

wfile('test.txt','hello world!')

执行后会在当前目录生成一个test.txt文件：