Lecture 2

Question 1

mutable objects definition

Answer 1

can be changed after they are created, like lists or dictionaries

Question 2

immutable objects definition

Answer 2

cannot be changed after they are created, such as strings, integers, or tuples.

Question 3

string slicing definition

Answer 3

obtaining a sub-string from the given string by slicing it respectively from start to end

Question 4

string slicing: array method. syntax

Answer 4

string_name[beginning:end:step]

*note that you can also index backwards in the steps parameter

Question 5

how do you reverse a string?

Answer 5

stringname[::-1]

Question 6

slice() constructor (syntax and what it does)

Answer 6

1. Returns a sliced object containing elements in the given range only.
2. slice(stop)
   OR
   slice(start, stop, step)

Question 7

how do you slice a list?

Answer 7

listname[start, stop, step]

Question 8

count method for strings

Answer 8

stringname.count(“stringtosearch”)

returns number of occurrences of argument in stringname.

Question 9

what does the index method do when used on a string and what is the syntax?

Answer 9

stringname.index(“character”)

returns the index of the character in argument

NOTE that it will not work with strings, singular characters only!!!!!!!

Question 10

what does the split method do to a string and what is the syntax?

Answer 10

stringname.split(delimeter, max splits)

splits every item in the string, returns a list

Question 11

join method syntax and what it does

Answer 11

joiner.join(sequencetojoin)

joins every element in a sequence uisng the joiner. returns a string.

Question 12

isdigit and isalpha

syntax and use

Answer 12

check if argument passed is numerical or alphabetical, returns true or false

Question 13

tuple definition

Answer 13

An ordered collection or grouping of items.

Question 14

cna you type cast a list into a tuple and vice versa?

Answer 14

YES!

Question 15

How do you access the elements in a tuple?

Answer 15

same way you do in a list, by indexing

Question 16

what are the only 6 methods usable with tuples?

Answer 16

only the ones that reutn information, not the ones that modify the thing:

count, index, min, max, len, sum

Question 17

what does the find function do and what is the syntax?

Answer 17

This function is used to find the position of the substring within a string.It takes 3 arguments, substring , starting index( by default 0) and ending index( by default string length).

It returns “-1 “ if string is not found in given range.

It returns first occurrence of string if found.

find(“string”, beg, end)

Question 18

startswith and endswith methods

Answer 18

S.startswith(‘string2’), S.endswith(‘string2’): tests if string starts or ends with the given s