= "Every moment is a fresh beginning." -T.S Eliot-' Output: print (quote [ ]) print (quote [2:7]. print("This quote has", end=" ") iii. print (quote.count quote i. ii. |)-2, "words.") T.S Eliot Output: EVERY Output: This quote has 6 words.

= "Every moment is a fresh beginning." -T.S Eliot-' Output: print (quote [ ]) print (quote [2:7]. print("This quote has", end=" ") iii. print (quote.count quote i. ii. |)-2, "words.") T.S Eliot Output: EVERY Output: This quote has 6 words.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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The following functions are all intended to check whether a string representing a dna sequence contains any characters that are not 'a','c','g','t', 'A', 'C', 'G', or 'T'. At least some of these functions are wrong. Which ones are correct? A) def valid_dna1(dna): for c in dna: if c in 'acgtACGT': return True else: return False B) def valid_dna3(dna): for c in dna: flag = c in 'acgtACGT' return flag C) def valid_dna4(dna): for c in dna: if not c in 'acgtACGT': return False return True -------------------------------------------------------------------------------------------------------------------------------------------------------- valid_dna1 only valid_dna4 only None of them. valid_dna1, and valid_dna4 only
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