Advanced Python Objects Test

Advanced Numbers

Problem 1: Convert 1024 to binary and hexadecimal representation:



In [1]:

    
print bin(1024)
print hex(1024)









    



0b10000000000
0x400

Problem 2: Round 5.23222 to two decimal places



In [2]:

    
print round(5.2322, 2)

Advanced Strings

Problem 3: Check if every letter in the string s is lower case



In [3]:

    
s = 'hello how are you Mary, are you feeling okay?'
print 'Yup' if s.islower() else 'Nope'









    



Nope

Problem 4: How many times does the letter 'w' show up in the string below?



In [4]:

    
s = 'twywywtwywbwhsjhwuwshshwuwwwjdjdid'
print s.count('w')

Advanced Sets

Problem 5: Find the elements in set1 that are not in set2:



In [6]:

    
set1 = {2,3,1,5,6,8}
set2 = {3,1,7,5,6,8}

print set1.difference(set2) # in set 1 but not set 2
print set2.difference(set1) # in set 2 but not set 1









    



set([2])
set([7])

Problem 6: Find all elements that are in either set:



In [9]:

    
print set1.union(set2) # all unique elements in either set
print set1.intersection(set2) # all elements in both sets









    



set([1, 2, 3, 5, 6, 7, 8])
set([8, 1, 3, 5, 6])

Advanced Dictionaries

Problem 7: Create this dictionary: {0: 0, 1: 1, 2: 8, 3: 27, 4: 64} using dictionary comprehension.



In [10]:

    
{x:x**3 for x in range(5)}









    Out[10]:





{0: 0, 1: 1, 2: 8, 3: 27, 4: 64}

Advanced Lists

Problem 8: Reverse the list below:



In [27]:

    
l = [1,2,3,4]
l.reverse() # reverses in place, call the list again to check
l









    Out[27]:





[4, 3, 2, 1]

Problem 9: Sort the list below



In [28]:

    
l = [3,4,2,5,1]
l.sort()
l