reading and writing data in a text file with python

1#for reading and writing data in a text file with python
2#First you must have a file Open or create a new file have it loaded in memory.
3# Open function to open the file "MyFile1.txt" 
4# (same directory) in append mode and 
5file1 = open("MyFile.txt","a") 
6
7# store its reference in the variable file1 
8# and "MyFile2.txt" in D:\Text in file2 
9file2 = open(r"D:\Text\MyFile2.txt","w+") 
10
11# Opening and Closing a file "MyFile.txt" 
12# for object name file1. 
13file1 = open("MyFile.txt","a") 
14file1.close() 
15
16# Program to show various ways to read and 
17# write data in a file. 
18file1 = open("myfile.txt","w") 
19L = ["This is Delhi \n","This is Paris \n","This is London \n"] 
20
21# \n is placed to indicate EOL (End of Line) 
22file1.write("Hello \n") 
23file1.writelines(L) 
24file1.close() #to change file access modes 
25
26file1 = open("myfile.txt","r+") 
27
28print "Output of Read function is "
29print file1.read() 
30print
31
32# seek(n) takes the file handle to the nth 
33# bite from the beginning. 
34file1.seek(0) 
35
36print "Output of Readline function is "
37print file1.readline() 
38print
39
40file1.seek(0) 
41
42# To show difference between read and readline 
43print "Output of Read(9) function is "
44print file1.read(9) 
45print
46
47file1.seek(0) 
48
49print "Output of Readline(9) function is "
50print file1.readline(9) 
51
52file1.seek(0) 
53# readlines function 
54print "Output of Readlines function is "
55print file1.readlines() 
56print
57file1.close() 
58
59# Python program to illustrate 
60# Append vs write mode 
61file1 = open("myfile.txt","w") 
62L = ["This is Delhi \n","This is Paris \n","This is London \n"] 
63file1.close() 
64
65# Append-adds at last 
66file1 = open("myfile.txt","a")#append mode 
67file1.write("Today \n") 
68file1.close() 
69
70file1 = open("myfile.txt","r") 
71print "Output of Readlines after appending"
72print file1.readlines() 
73print
74file1.close() 
75
76# Write-Overwrites 
77file1 = open("myfile.txt","w")#write mode 
78file1.write("Tomorrow \n") 
79file1.close() 
80
81file1 = open("myfile.txt","r") 
82print "Output of Readlines after writing"
83print file1.readlines() 
84print
85file1.close() 
86
87Output of Readlines after appending
88['This is Delhi \n', 'This is Paris \n', 'This is London \n', 'Today \n']
89
90Output of Readlines after writing
91['Tomorrow \n']