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1) To delete an entry with the key 'a' from the dictionary dna_counts={'g': 13, 'c': 3, 't': 1, 'a': 16} what command do we use? dna_counts[-1]='' dna_counts['a']='' dna_counts.delete('a':16) del dna_counts['a']   2)  Suppose L1 and L2 are two list variables. What does the list variable L3 = list(set(L1)&set(L2)) contain?

1) To delete an entry with the key 'a' from the dictionary dna_counts={'g': 13, 'c': 3, 't': 1, 'a': 16} what command do we use? dna_counts[-1]='' dna_counts['a']='' dna_counts.delete('a':16) del dna_counts['a']   2)  Suppose L1 and L2 are two list variables. What does the list variable L3 = list(set(L1)&set(L2)) contain?

Database System Concepts
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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1) To delete an entry with the key 'a' from the dictionary dna_counts={'g': 13, 'c': 3, 't': 1, 'a': 16} what command do we use?

  1. dna_counts[-1]=''
  2. dna_counts['a']=''
  3. dna_counts.delete('a':16)
  4. del dna_counts['a']

     

2)  Suppose L1 and L2 are two list variables. What does the list variable L3 = list(set(L1)&set(L2)) contain?

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