PYTHON 3 PRACTICE PROGRAM

String Problem

Description

In a certain encrypted message which has information about the location(area, city), the characters are jumbled such that first character of the first word is followed by the first character of the second word, then it is followed by second character of the first word and so on

In other words, let’s say the location is bandra,mumbai

The encrypted message says ‘bmaunmdbraai’.

Sample Input:

bmaunmdbraai

Sample Output:

bandra,mumbai

Let’s say the size or length of the two words wouldn’t match then the smaller word is appended with # and then encrypted in the above format.

With this in mind write a code to identify the right location and print it as place,city.

Solution Code

#code

import ast,sys

input_str = sys.stdin.read()

message1 = input_str[0:-1:2]

message2 = input_str[1:len(input_str):2]

print(message1.strip('#') + "," + message2.strip('#'))

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Tuple

Description

Add the element ‘Python’ to a tuple input_tuple = ('Monty Python', 'British', 1969). Since tuples are immutable, one way to do this is to convert the tuple to a list, add the element, and convert it back to a tuple.

Sample Input:

('Monty Python', 'British', 1969)

Sample Output:

('Monty Python', 'British', 1969, 'Python')

Solution Code

#code

import ast,sys

input_str = sys.stdin.read()

input_tuple = ast.literal_eval(input_str)

list_1 = list(input_tuple)

list_1.append('Python')

tuple_2 = tuple(list_1)

print(tuple_2)

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STRING SPLIT

Description

Split the string input_str = 'Kumar_Ravi_003' to the person's second name, first name and unique customer code. In this example, second_name= 'Kumar', first_name= 'Ravi', customer_code = '003'.

A sample output of the input 'Kumar_Ravi_003' is:

Ravi Kumar 003

 

Note that you need to print in the order first name, last name and customer code.

#code

import ast,sys

input_str = sys.stdin.read()

name = input_str.split('_')

first_name = name[1]

second_name = name[0]

customer_code = name[2]

print(first_name)

print(second_name)

print(customer_code)

List Indexing

Suppose list_1 is [2, 33, 222, 14, 25]. What is list_1[-5]?

2

33

[]

Error

Solution

             option 1 (2)

List_remove_append

Description

Remove SPSS from input_list=['SAS', 'R', 'PYTHON', 'SPSS'] and add 'SPARK' in its place.

Sample Input:

['SAS', 'R', 'PYTHON', 'SPSS']

Sample Output:

['SAS', 'R', 'PYTHON', 'SPARK']

Execution Time Limit

15 seconds

SOLUTION CODE

#CODE

import ast,sys

input_list = (sys.stdin.read()).split(',')

input_list.remove('SPSS')

input_list.append('SPARK')

print(input_list)

List Manipulation

word = ['1','2','3','4']
word[ : ] = [ ] 
print(word)

What would be the output of the code above?

Error

The output will have an additional space after each element.

Empty list

['1','2','3','4']

SOLUTION 

ANSWER IS   "EMPTY LIST " (option 3)

Nested List

How will I extract Python from the nested list

input_list =  [['SAS','R'],['Tableau','SQL'],['Python','Java']]

 

input_list[2][0]

✓ Correct

Feedback:

Using the slicing concept we can extract Python from the nested list. Here indexing starts from 0 and as the given list is a nested list then from index position 2 we have to extract the first element which is Python and whose index position is 0.

input_list[2][0]

'Python'

Hint: Make use of Jupyter notebook

input_list[2]

input_list[0]

input_list[1]

ANSWER IS OPTION A (

input_list[2][0])

List Sorting

Consider the following list:

L = ['one','two','three', 'four', 'five', 'six']
print(sorted(L))
print (L)

 

['five', 'four', 'one', 'six', 'three', 'two']

['one', 'two', 'three', 'four', 'five', 'six']

['one', 'two', 'three', 'four', 'five', 'six']

['five', 'four', 'one', 'six', 'three', 'two']

['five', 'four', 'one', 'six', 'three', 'two']

['five', 'four', 'one', 'six', 'three', 'two']

Error

answer is option A 

['five', 'four', 'one', 'six', 'three', 'two']

['one', 'two', 'three', 'four', 'five', 'six']