String Intreview Question-Python

1. How would you confirm that 2 strings have the same identity?

In [12]:

animals           = ['python','gopher']
more_animals      = animals

if id(animals)==id(more_animals):
    print("True")
else:
    print("false")

True

2. How would you check if each word in a string begins with a capital letter?

In [13]:

a="Missile City Baleswar"
print(a.istitle())

True

3. Check if a string contains a specific substring

In [14]:

a="Missile City Baleswar"
print('Missile' in a)

True

4. Find the index of the first occurrence of a substring in a string

In [15]:

'The worlds fastest plane'.find('plane') #=> 19

Out[15]:

19

In [22]:

''' There are 2 different functions that will return the starting index, find() and index(). 
They have slightly different behaviour.

find() returns -1 if the substring is not found.'''

a="Missile City Baleswar"
b="BBSR is a TempleCity"

print(a.find('Missile'))
print(a.find('car'))

'''index() will throw a ValueError.'''

print(a.index('Missile'))
#print(a.index('car'))#=> ValueError: substring not found

0
-1
0

5. Count the total number of characters in a string

In [26]:

a="Missile City Baleswar"
print("No of count of i is", a.count('i'))

No of count of i is 3

7. Capitalize the first character of a string

In [28]:

z='arabinda mohapatra'
print("Capitalize the first character of a string", z.capitalize())

Capitalize the first character of a string Arabinda mohapatra

8. What is an f-string and how do you use it?

In [32]:

''' Using f-strings is similar to using format().'''


print("My name is{},{} ".format('Arabinda','Mohapatra'))

My name isArabinda,Mohapatra 

9. Search a specific part of a string for a substring

In [33]:

print('the happiest person in the whole wide world.'.index('the',10,44))
print('the happiest person in the whole wide world.'.index('the'))

Out[33]:

23

10. Interpolate a variable into a string using format()

In [37]:

difficulty = 'level of exam'
thing = 'tough'
print('That {} was {}!'.format(thing, difficulty))

That tough was level of exam!

11. Check if a string contains only numbers

In [41]:

a='1'
a.isnumeric()

True

12. Split a string on a specific character

In [44]:

print('This is great'.split(' '))

print('not--so--great'.split('--'))

['This', 'is', 'great']
['not', 'so', 'great']

13. Check if a string is composed of all lower case characters

In [46]:

a="I am a bad rider"
a.islower()

Out[46]:

False

14. Check if the first character in a string is lowercase

In [48]:

a="ARABINDA"
print(a[0].islower())

False

15. Can an integer be added to a string in Python? Ans:It will through an error 16. Reverse the string “hello world”

In [59]:

z="Honda CBR650r"
print(''.join(reversed(z)))

r056RBC adnoH

In [58]:

''.join(reversed(z))

Out[58]:

'r056RBC adnoH'

17. Join a list of strings into a single string, delimited by hyphens

In [62]:

'-'.join(z)

Out[62]:

'H-o-n-d-a- -C-B-R-6-5-0-r'

18. Check if all characters in a string conform to ASCII

In [63]:

print( z.isascii() )

True

19. Uppercase or lowercase an entire string 20-When would you use rfind()?

In [1]:

#Shing from right side
story = 'The price is right said Bob. The price is right.'
story.rfind('is')

Out[1]:

39

21-Remove vowels from a string

In [4]:

string = 'Hello 1 World 2'
vowels = ('a','e','i','o','u')
''.join([c for c in string if c not in vowels])

Out[4]:

'Hll 1 Wrld 2'

22-Does defining a string twice (associated with 2 different variable names) create one or two objects in memory?

In [8]:

Country="INDIA"
Desh="INDIA"
print("Id of Country is ",id(Country))
print("Id of Desh is ",id(Desh))

Id of Country is  1407903792688
Id of Desh is  1407903792688

23. What does it mean for strings to be immutable in Python?

In [10]:

'''Once a string object has been created, it cannot be changed. “Modifying” that string creates a whole new object in memory.
We can prove it by using the id() function.''' 
proverb = 'Rise each day before the sun'
print( id(proverb) )

proverb_two = 'Rise each day before the sun' + ' if its a weekday'
print( id(proverb_two) )

1407899591184
1407903616912

24. Give an example of using maketrans() and translate()

In [1]:

#maketrans() creates a mapping from characters to other characters. translate() then applies that mapping to translate a string.
# create mapping
mapping = str.maketrans("abcs", "123S")
# translate string
"abc are the first three letters".translate(mapping)

Out[1]:

'123 1re the firSt three letterS'

25. Give an example of using the partition() function

In [2]:

#partition() splits a string on the first instance of a substring. A tuple of the split string is returned without the substring removed.
str="India is my country"
str.partition('is')

Out[2]:

('India ', 'is', ' my country')

26. Concatenate two strings

In [6]:

#The additional operator can be used to concatenate strings.
print('ram' +' '+ 'shyam')

ram shyam

27. Capitalize the first character of each word in a string

In [7]:

#title() will capitalize each word in a string.##
print(str.title())

India Is My Country

28. Check if all characters are whitespace characters

In [11]:

#isspace() only returns True if a string is completely made of whitespace.
print(str.isspace())
str_space="  "
print(str_space.isspace())

False
True

29. Check if a string begins with or ends with a specific character?

In [15]:

#startswith() and endswith() check if a string begins and ends with a specific substring.
city = 'Balasore'
print(city.startswith('B'))
print(city.endswith('B'))

True
False

In [ ]:

30. Remove whitespace from the left, right or both sides of a string.

lstrip(), rstrip() and strip() remove whitespace from the ends of a string.