Lecture 4 - More on strings

Question 1

what is the similarity and difference between str and repr

Answer 1

Similarity: both functions convert other types to string

Difference: while repr gives back the exact underlying string value (useful for programmers while debugging) str gives back readable string values which sometimes leads to the manipulation (like shortening) of the exact values.

Question 2

String Interpolation is equivalent to

Answer 2

Formatting other types to string

Question 3

%s, %d, %o, %x, %f, %%

Answer 3

string, integer, octal number, hexadecimal values, float point, to print

Question 4

Python uses __ ordering for comparing strings

Define it.

Answer 4

lexicographic ordering - compares the first to the first, if they differ it determines the outcome; if they are equal it compares the next two values and so on until either is exhausted

Question 5

‘FRED’

Answer 5

“fred”.upper( )

Question 6

‘fred’

Answer 6

“FRED”.lower( )

Question 7

2

Answer 7

“Mississippi”.count(“ss”)

Question 8

“iss” in “Mississippi”

Answer 8

True

Question 9

Given a positive integer, calculate the number of digits

it has in base 10

Answer 9

i = 10

len.(“%d” % i)