Functions and Methods Homework Solutions¶

Write a function that computes the volume of a sphere given its radius.

In [1]:

def vol(rad):
    return (4/3)*(3.14)*(rad**3)

In [2]:

# Check
vol(2)

Out[2]:

33.49333333333333

Write a function that checks whether a number is in a given range (inclusive of high and low)

In [3]:

def ran_check(num,low,high):
    #Check if num is between low and high (including low and high)
    if num in range(low,high+1):
        print('{} is in the range between {} and {}'.format(num,low,high))
    else:
        print('The number is outside the range.')

In [4]:

# Check
ran_check(5,2,7)

5 is in the range between 2 and 7

If you only wanted to return a boolean:

In [5]:

def ran_bool(num,low,high):
    return num in range(low,high+1)

In [6]:

ran_bool(3,1,10)

Out[6]:

True

Write a Python function that accepts a string and calculates the number of upper case letters and lower case letters.

Sample String : 'Hello Mr. Rogers, how are you this fine Tuesday?'
Expected Output : 
No. of Upper case characters : 4
No. of Lower case Characters : 33

If you feel ambitious, explore the Collections module to solve this problem!

In [7]:

def up_low(s):
    d={"upper":0, "lower":0}
    for c in s:
        if c.isupper():
            d["upper"]+=1
        elif c.islower():
            d["lower"]+=1
        else:
            pass
    print("Original String : ", s)
    print("No. of Upper case characters : ", d["upper"])
    print("No. of Lower case Characters : ", d["lower"])

In [8]:

s = 'Hello Mr. Rogers, how are you this fine Tuesday?'
up_low(s)

Original String :  Hello Mr. Rogers, how are you this fine Tuesday?
No. of Upper case characters :  4
No. of Lower case Characters :  33

Write a Python function that takes a list and returns a new list with unique elements of the first list.

Sample List : [1,1,1,1,2,2,3,3,3,3,4,5]
Unique List : [1, 2, 3, 4, 5]

In [9]:

def unique_list(lst):
    # Also possible to use list(set())
    x = []
    for a in lst:
        if a not in x:
            x.append(a)
    return x

In [10]:

unique_list([1,1,1,1,2,2,3,3,3,3,4,5])

Out[10]:

[1, 2, 3, 4, 5]

Write a Python function to multiply all the numbers in a list.

Sample List : [1, 2, 3, -4]
Expected Output : -24

In [11]:

def multiply(numbers):
    total = 1
    for x in numbers:
        total *= x
    return total

In [12]:

multiply([1,2,3,-4])

Out[12]:

-24

Write a Python function that checks whether a passed string is palindrome or not.

Note: A palindrome is word, phrase, or sequence that reads the same backward as forward, e.g., madam or nurses run.

In [13]:

def palindrome(s):
    
    s = s.replace(' ','') # This replaces all spaces ' ' with no space ''. (Fixes issues with strings that have spaces)
    return s == s[::-1]   # Check through slicing

In [14]:

palindrome('nurses run')

Out[14]:

True

In [15]:

palindrome('abcba')

Out[15]:

True

Hard:

Write a Python function to check whether a string is pangram or not.

Note : Pangrams are words or sentences containing every letter of the alphabet at least once.
For example : "The quick brown fox jumps over the lazy dog"

Hint: Look at the string module

In [16]:

import string

def ispangram(str1, alphabet=string.ascii_lowercase):  
    alphaset = set(alphabet)  
    return alphaset <= set(str1.lower())  

In [17]:

ispangram("The quick brown fox jumps over the lazy dog")

Out[17]:

True

In [18]:

string.ascii_lowercase

Out[18]:

'abcdefghijklmnopqrstuvwxyz'