Strings

Question 1

What are strings?

Answer 1

quotation enclosed set of characters ‘abc”, ‘xyz’ ‘xxx’

Question 2

operations on strings?

Answer 2

→ Concatenation
→ Repetition
→ Membership
→Slicing [Start:stop:step]

Question 3

Concatenation?

Answer 3

a=”Hello”
b=”guys”
print(a+b)

Question 4

Repetition?

Answer 4

a=”Hello”
print(a*2)
o/p: Hello Hello

Question 5

Membership(in,notin)?

Answer 5

s= “computer science”
print(“science” in s) #true
print(“science” not in s) #false

Question 6

capitalize()

Answer 6

First letter capital rest lower case

Question 7

title()

Answer 7

First letter in each words becomes capital

Question 8

lower()

Answer 8

each letter becomes lower case

Question 9

upper()

Answer 9

each letter becomes upper case

Question 10

find() and index()

Answer 10

Gives positive index number of first letter of that word

Question 11

Keep in mind:(For built in functions way to type)

Answer 11

these built in functions are used as:
s= “computer science”
print(s.upper())
print(s.lower())
print(s.title())
print(s.find(“A”)) # 18 16 etc

Question 12

Index and find difference

Answer 12

Index gives error if word not found
Find gives -1

Question 13

count()

Answer 13

counts number of times a character appears in a string

Question 14

startswith() endswith()

Answer 14

checks whether string starts/ends with letter in argument
str1= “Computer Science”
print(str1.startswith(C)) #TRUE

Question 15

isalnum()

Answer 15

checks whether a string contains alphabets or numbers without spacebar

Question 16

isalpha()

Answer 16

gives true if every character is alphabet

Question 17

isdigit()

Answer 17

gives true if every character is number

Question 18

islower()

Answer 18

gives true if every letter in lowercase

Question 19

strip()
lstrip()
rstrip()

Answer 19

removes leading and trailing spaces in string
str1= ‘hello world”
print(str1.strip())
o/p: hello world

Question 20

replace()

Answer 20

replaces character with new one