Answer:
There is no difference between ‘’ and “” string type in python. Both are used to hold the string or sequence of character in the python. triple """ """ can also use for the same.
Example:
str1 = "aeiou"
str2 = 'aeiou'
str3 =""" hello"""
print(type(str1), type(str2),type(str3))
<class 'str'> <class 'str'> <class 'str'>
Here all are used to hold string or sequence of character.
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Answer and Explanation:
Given that total number of records in a file = 100000
Each record consists of= 240 bytes
Given that B= 2400 bytes.
Then total blocks in file = 100000 records * 240 / 2400
= 10000 blocks.
Time that will take for exhaustive read
= s + r + b.btt
= 16 + 8.3 + (10000) * 0.8
= 8024.3 msec
Now as per given X be the number of records that are searched randomly and it takes more than exhaustive read time.
Hence, X (s + r + btt) > 8024.3
X (16+8.3+0.8) > 8024.3
X > 8024.3/25.1
So that, X > 319.69
Hence, atleast 320 random reads should be made to search the file
Answer:
Like ordinary random access memory (RAM), it can be repeatedly read, written to, and erased. Intended mostly for removable computer storage, DVD-RAM provides the capabilities of Rewriteable CD (CD-RW) - users can run programs from the discs, copy files to them and rewrite or delete them.
