小白学Python（二） 基本文件操作

这是基本的文件操作示例，是《Python核心编程》上的样例程序对Python3.4的适配版，如有不足请诸君斧正

一、编写程序创建新文件并向文件内写入内容

"""makeTextFile.py use this to create a new file"""
"""You need to open the file with notepad to check the line break"""

import os
ls = os.linesep

#get file name
while True:
	fname = input("\nPlease input the file name:\n>")
	if os.path.exists(fname):
		print("ERROR: " + '%s'  %fname + " already existes")
	else:
		break

#get file content lines
all = []
print("\nEnter lines ('.' by itself to quit).\n")
while True:
	line = input('>')
	if line == '.':
		break
	else:
		all.append(line)

#write to file
wfile = open(fname, 'w')

for each in all:
	wfile.write(each + ls)

wfile.close()
print("DONE!")

二、编写程序打开文件并将内容打印至屏幕

"""Display text file"""

import os

fname = input("Please input the file name\n>")

with open(fname, 'r') as rfile:
	for each_line in rfile:
		print(each_line)
	rfile.close()