Exam 98-381 topic 1 question 30 discussion

Actual exam question from Microsoft's 98-381

Question #: 30
Topic #: 1

You develop a Python application for your school.
You need to read and write data to a text file. If the file does not exist, it must be created. If the file has content, the content must be removed.
Which code should you use?

A. open("local_data", "r")
B. open("local_data", "r+")
C. open("local_data", "w+")
D. open("local_data", "w")

Show Suggested Answer

Suggested Answer: C 🗳️
Modes 'r+', 'w+' and 'a+' open the file for updating (reading and writing). Mode 'w+' truncates the file.
References:
https://docs.python.org/2/library/functions.html
https://pythontips.com/2014/01/15/the-open-function-explained/

by s_balla_in at Dec. 2, 2019, 11:33 a.m.

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atxsu

Highly Voted 5 years, 3 months ago

r+ = Open for reading and writing. The stream is positioned at the beginning of the file. w+ = Open for reading and writing. The file is created if it does not exist, otherwise it is truncated. The stream is positioned at the beginning of the file. I think the answer is C.

upvoted 5 times

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print_HelloWorld

Most Recent 3 years, 1 month ago

Selected Answer: C

The correct answer is C, I have used w+ before, r+ does not create a file if it doesn't exist but w+ does. Here's the reference to the website: https://stackoverflow.com/questions/28100993/in-python-why-is-r-but-not-rw-used-to-mean-read-write

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