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** read text file in python
capability: reading =text= from a text file
1. open the idle text editor
>>> idle3
2. declare a *string* variable that holds *the path to the text file*, =test.txt=
>>> strpath="/home/kaiming/documents/python/text/text.dat"
3. open the file using the =open()= function
>>> f=open(strpath)
4. read the contents of the file using the =read()= function
>>> strtext=f.read()
5. print out the contents of the file
>>> print(strtext)
refer to
https://docs.python.org/2/tutorial/inputoutput.html
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