Assignment 26: str

1. Write a Python script to check if a given string has only alphabets in it.

2. Write a Python script to check if a given character is present in a given string or not.

3. Write a Python script to count vowels in a given string.

4. Write a Python script to count words in a given string.

5. Write a Python script to reverse a string.

s = "msc"

s.isalpha()

True

"msc" in s

True

len(s)

3

s = "I am a Masters student"

s.split()

['I', 'am', 'a', 'Masters', 'student']

"-".join(s.split())

'I-am-a-Masters-student'

sum([1 for ch in s])

22

"apple" and "banana"

'banana'

function handles - lambda

function_name = lambda inputs: body

def function_name(input):

\(~~\) body

\(~~\) return

reverss_s = lambda s: s and s[:-1]+reverss_s(s[:-1])

reverss_s("apple")

'applappapa'

reverss_s = lambda s: s and s[-1]+reverss_s(s[:-1])

reverss_s("apple")

'elppa'

s = "apple"

s[::-1]

'elppa'

Assignment 27: More on str

1. Write a Python script to reverse a string word-wise.

   Example: “mysirg education services”

   Result: “services education mysirg”

2. Write a Python script to extract numbers from a given text and store all the numbers in a list.

3. Write a Python script to check whether a string is a palindrome or not.

4. Write a Python script to transform a given string to uppercase.

5. Write a Python script to find the maximum-length word in a given text.

sentence = "mysirg education services"

" ".join(sentence.split()[::-1])

'services education mysirg'

text = "siva1"

text = "mam"

print(text == text[::-1])

True

[ch for ch in text if ch.isdigit()]

['1']

text.upper()

'MAM'

sentence = "I am a master student"

max_len = max([len(string) for string in sentence.split()])

for word in sentence.split():
  if len(word)==max_len:
    print(word)

student

Assignment 28: List and str Mixed

1. Write a Python script to remove all non-int values from a list.

2. Write a Python script to print distinct elements along with their frequencies of occurrences in the list.

3. Write a Python script to sort a list of strings.

4. Write a Python script to find the first repeated string in a list of strings.

5. Write a Python script to count strings which end with the character ‘s’ in a list of strings.

dummy_list = ["siva", "k", 1, 2, 3]

for elements in dummy_list:
  if type(elements) == int:
    dummy_list.remove(elements)

new_list =[]
for elements in dummy_list:
  if type(elements) == int:
    new_list.append(elements)

new_list

[1, 2, 3]

dummy_list,

['siva', 'k', 2]

dummy_list = [1,2,3,4,5,1,2,3,1,2,3]

dummy_set = set(dummy_list)

dummy_set

{1, 2, 3, 4, 5}

frequency_list = []

for elemnets in dummy_set:
  count = 0
  for elements in dummy_list:
    if elements == elemnets:
      count+=1
  frequency_list.append(count)

frequency_list

[3, 3, 3, 1, 1]

name_of_people = ["siva", "ganesh", "madhan"]

"apple"<"aqple"

True

sorted(name_of_people)

['ganesh', 'madhan', 'siva']

print(ord('s'))

115

text = "apple"

text_set=set([ch for ch in text])

for ch1 in text_set:
  count = 0
  for ch2 in text:
    if ch1 ==ch2:
      count+=1
    if count >=2:
      print(ch1)
      break

p

sentence = "I am having class of MSC AM and MSC SC"

set(sentence.split())

{'AM', 'I', 'MSC', 'SC', 'am', 'and', 'class', 'having', 'of'}

sentence.split()

['I', 'am', 'having', 'class', 'of', 'MSC', 'AM', 'and', 'MSC', 'SC']

for word1 in set(sentence.split()):
  count =0
  for word2 in sentence.split():
    if word1 == word2:
      count+=1
    if count >=2:
      print(word1)
      break

MSC

dummy_list = ['dogs', 'cats', 'dog']

text = "dogs"
text.endswith('s')

True

[string for string in dummy_list if string.endswith('s')]

['dogs', 'cats']

dummy_list = ['dogs', 'cats', 'dog', 12]

[string for string in dummy_list if type(string)==str if string.endswith('s')]

['dogs', 'cats']

Assignment 29: Tuple

1. Write a Python script to create a tuple from a given list.

2. Write a Python script to reverse a tuple.

3. Write a Python script to create a list of tuples from a given list of strings, where each tuple is a collection of strings beginning with the same character.

4. Write a Python script to create a list of tuples, where each tuple is a pair of elements: first element is an uppercase character and second element is its Unicode.

5. Write a Python script to find the sum of all odd numbers stored in a tuple.

(2,34)[0] =0

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/tmp/ipykernel_867/3547268627.py in <cell line: 0>()
----> 1 (2,34)[0] =0

TypeError: 'tuple' object does not support item assignment

dummy_list = [2,3]
dummy_list[0]=0

dummy_list

[0, 3]

tuple(dummy_list)

(0, 3)

tuple(dummy_list)[::-1]

(3, 0)

list_of_strings = ["apple", "banna"]

[(ele_from_str[0], ele_from_str) for ele_from_str in list_of_strings]

[('a', 'apple'), ('b', 'banna')]

[(ele_from_str[0], ord(ele_from_str[0])) for ele_from_str in list_of_strings]

[('a', 97), ('b', 98)]

dummy_tuple = (1,2,3,4,5,6,7,8,9)

sum([num for num in dummy_tuple if num%2!=0])

25

Assignment 30: Set

1. Write a Python script to print all distinct elements of a list. Use set to solve the problem.

2. Create two sets from a given set of numbers to separate even and odd numbers.

3. Given a set of five player names, write a Python script to form all possible pairs of players by selecting two players at a time.

4. Given a list of candidates wearing black hats and another list of candidates wearing red shoes, find the candidates wearing both black hats and red shoes.

5. Write a Python script to create a set of tuples, where each tuple has two dice values. Take N from the user and generate all possible tuples such that the tuple elements sum to N.

set([1,2,1,2])

{1, 2}

players_name = {"A", "B", "C", "D", "E"}

[(player1, player2) for player1 in players_name for player2 in players_name if player1!=player2]

[('B', 'D'),
 ('B', 'A'),
 ('B', 'E'),
 ('B', 'C'),
 ('D', 'B'),
 ('D', 'A'),
 ('D', 'E'),
 ('D', 'C'),
 ('A', 'B'),
 ('A', 'D'),
 ('A', 'E'),
 ('A', 'C'),
 ('E', 'B'),
 ('E', 'D'),
 ('E', 'A'),
 ('E', 'C'),
 ('C', 'B'),
 ('C', 'D'),
 ('C', 'A'),
 ('C', 'E')]

[(list(players_name)[i], list(players_name)[j])
for i in range(len(players_name))
for j in range(i+1,len(players_name))]

[('B', 'D'),
 ('B', 'A'),
 ('B', 'E'),
 ('B', 'C'),
 ('D', 'A'),
 ('D', 'E'),
 ('D', 'C'),
 ('A', 'E'),
 ('A', 'C'),
 ('E', 'C')]