1、open&argument
1 my_file = open("output.txt", "w")
hint:You can open files in write-only mode ("w"), read-only mode ("r"), readand write mode ("r+"), and append mode ("a", which adds any new data you write to the file to the end of the file).
2、write
1 my_list = [i**2 for i in range(1,11)] 2 print my_list 3 my_file = open("output.txt", "w") 4 5 # Add your code below! 6 for i in range(len(my_list)): 7 my_file.write(str(my_list[i])) 8 my_file.write(‘\n‘) 9 if i == len(my_list): 10 my_file.close()
3、read
1 my_file = open(‘output.txt‘,‘r‘) 2 print my_file.read() 3 my_file.close()
4、readline（）
1 my_file = open(‘text.txt‘,‘r‘) 2 for i in range(3): 3 print my_file.readline() 4 my_file.close()
5、 with
1 with open("text.txt", "w") as textfile: 2 textfile.write("Success!")
原文：http://www.cnblogs.com/andrew-elec90/p/4111858.html