Python: Append data to a file

Open a file in append mode and write data to file.

>>> f=open("/Users/harikrishna_gurram/data.txt", 'r')
>>> f.read()
'first line'
>>> f.close()
>>> 
>>> f=open("/Users/harikrishna_gurram/data.txt", 'a')
>>> f.write("\nSecond line")
12
>>> f.write("\nThird line")
11
>>> f.close()
>>> f=open("/Users/harikrishna_gurram/data.txt")
>>> f.read()
'first line\nSecond line\nThird line'
>>> 
>>> f=open("/Users/harikrishna_gurram/data.txt")
>>> for line in f:
...     print(line, end='')
... 
first line
Second line
Third line

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