File I/O, Exception, Assertion COL 100 - Introduction to Computer - - PowerPoint PPT Presentation

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File I/O, Exception, Assertion COL 100 - Introduction to Computer Science Department of Computer Science and Engineering Indian Institute of Technology Delhi Reading and Writing Files It is a common task to read some input data file

SLIDE 1

File I/O, Exception, Assertion

COL 100 - Introduction to Computer Science

Department of Computer Science and Engineering Indian Institute of Technology Delhi

SLIDE 2

Reading and Writing Files

It is a common task to

read some input data file
do some calculation/filtering/processing with the data
write some output data file with results

Python distinguishes between

text files ('t')
binary files 'b')

If we don’t specify the file type, Python assumes we mean text files.

SLIDE 3

Reading and Writing Files

Writing a text file

https://www.southampton.ac.uk/~fangohr/training/python/pdfs/Python-for-Computational-Science-and-Engineering.pdf

SLIDE 4

Reading and Writing Files

Writing a text file

https://www.southampton.ac.uk/~fangohr/training/python/pdfs/Python-for-Computational-Science-and-Engineering.pdf

SLIDE 5

Reading and Writing Files

Reading a text file

https://www.southampton.ac.uk/~fangohr/training/python/pdfs/Python-for-Computational-Science-and-Engineering.pdf

SLIDE 6

Reading and Writing Files

Reading a text file

https://www.southampton.ac.uk/~fangohr/training/python/pdfs/Python-for-Computational-Science-and-Engineering.pdf

SLIDE 7

Reading and Writing Files

Exercise

https://www.southampton.ac.uk/~fangohr/training/python/pdfs/Python-for-Computational-Science-and-Engineering.pdf

SLIDE 8

Reading and Writing Files

Exercise

https://www.southampton.ac.uk/~fangohr/training/python/pdfs/Python-for-Computational-Science-and-Engineering.pdf

SLIDE 9

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

SLIDE 10

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

SLIDE 11

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

SLIDE 12

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

SLIDE 13

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

SLIDE 14

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

SLIDE 15

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

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Exceptions

SLIDE 17

Exceptions

SLIDE 18

Assertion

Want to be sure that assumptions on state of

computation are as expected

use an assert statement to raise an exception
an example of good defensive programming

SLIDE 19

Assertion

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/

SLIDE 20

Assertion

Source:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and- programming-in-python-fall-2016/lecture-slides-code/