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‎100+ Python challenging programming exercises.txt‎

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@@ -2040,13 +2040,337 @@ t = Timer("for i in range(100):1+1")
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print t.timeit()
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#----------------------------------------#
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Question:
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Please write a program to shuffle and print the list [3,6,7,8].
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Hints:
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Use shuffle() function to shuffle a list.
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Solution:
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from random import shuffle
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li = [3,6,7,8]
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shuffle(li)
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print li
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#----------------------------------------#
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Question:
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Please write a program to shuffle and print the list [3,6,7,8].
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Hints:
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Use shuffle() function to shuffle a list.
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Solution:
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from random import shuffle
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li = [3,6,7,8]
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shuffle(li)
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print li
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#----------------------------------------#
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Question:
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Please write a program to generate all sentences where subject is in ["I", "You"] and verb is in ["Play", "Love"] and the object is in ["Hockey","Football"].
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Hints:
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Use list[index] notation to get a element from a list.
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Solution:
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subjects=["I", "You"]
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verbs=["Play", "Love"]
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objects=["Hockey","Football"]
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for i in range(len(subjects)):
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for j in range(len(verbs)):
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for k in range(len(objects)):
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sentence = "%s %s %s." % (subjects[i], verbs[j], objects[k])
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print sentence
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#----------------------------------------#
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Please write a program to print the list after removing delete even numbers in [5,6,77,45,22,12,24].
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Hints:
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Use list comprehension to delete a bunch of element from a list.
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Solution:
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li = [5,6,77,45,22,12,24]
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li = [x for x in li if x%2!=0]
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print li
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#----------------------------------------#
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Question:
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By using list comprehension, please write a program to print the list after removing delete numbers which are divisible by 5 and 7 in [12,24,35,70,88,120,155].
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Hints:
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Use list comprehension to delete a bunch of element from a list.
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Solution:
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li = [12,24,35,70,88,120,155]
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li = [x for x in li if x%5!=0 and x%7!=0]
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print li
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#----------------------------------------#
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Question:
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By using list comprehension, please write a program to print the list after removing the 0th, 2nd, 4th,6th numbers in [12,24,35,70,88,120,155].
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Hints:
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Use list comprehension to delete a bunch of element from a list.
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Use enumerate() to get (index, value) tuple.
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Solution:
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li = [12,24,35,70,88,120,155]
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li = [x for (i,x) in enumerate(li) if i%2!=0]
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print li
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#----------------------------------------#
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Question:
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By using list comprehension, please write a program generate a 3*5*8 3D array whose each element is 0.
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Hints:
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Use list comprehension to make an array.
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Solution:
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array = [[ [0 for col in range(8)] for col in range(5)] for row in range(3)]
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print array
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#----------------------------------------#
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Question:
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By using list comprehension, please write a program to print the list after removing the 0th,4th,5th numbers in [12,24,35,70,88,120,155].
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Hints:
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Use list comprehension to delete a bunch of element from a list.
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Use enumerate() to get (index, value) tuple.
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Solution:
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li = [12,24,35,70,88,120,155]
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li = [x for (i,x) in enumerate(li) if i not in (0,4,5)]
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print li
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#----------------------------------------#
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Question:
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By using list comprehension, please write a program to print the list after removing the value 24 in [12,24,35,24,88,120,155].
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Hints:
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Use list's remove method to delete a value.
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Solution:
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li = [12,24,35,24,88,120,155]
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li = [x for x in li if x!=24]
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print li
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#----------------------------------------#
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Question:
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With two given lists [1,3,6,78,35,55] and [12,24,35,24,88,120,155], write a program to make a list whose elements are intersection of the above given lists.
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Hints:
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Use set() and "&=" to do set intersection operation.
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Solution:
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set1=set([1,3,6,78,35,55])
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set2=set([12,24,35,24,88,120,155])
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set1 &= set2
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li=list(set1)
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print li
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#----------------------------------------#
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With a given list [12,24,35,24,88,120,155,88,120,155], write a program to print this list after removing all duplicate values with original order reserved.
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Hints:
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Use set() to store a number of values without duplicate.
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Solution:
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def removeDuplicate( li ):
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newli=[]
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seen = set()
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for item in li:
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if item not in seen:
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seen.add( item )
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newli.append(item)
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return newli
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li=[12,24,35,24,88,120,155,88,120,155]
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print removeDuplicate(li)
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#----------------------------------------#
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Question:
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Define a class Person and its two child classes: Male and Female. All classes have a method "getGender" which can print "Male" for Male class and "Female" for Female class.
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Hints:
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Use Subclass(Parentclass) to define a child class.
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Solution:
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class Person(object):
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def getGender( self ):
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return "Unknown"
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class Male( Person ):
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def getGender( self ):
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return "Male"
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class Female( Person ):
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def getGender( self ):
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return "Female"
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aMale = Male()
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aFemale= Female()
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print aMale.getGender()
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print aFemale.getGender()
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#----------------------------------------#
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Question:
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Please write a program which count and print the numbers of each character in a string input by console.
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Example:
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If the following string is given as input to the program:
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abcdefgabc
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Then, the output of the program should be:
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a,2
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c,2
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b,2
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e,1
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d,1
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g,1
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f,1
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Hints:
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Use dict to store key/value pairs.
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Use dict.get() method to lookup a key with default value.
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Solution:
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dic = {}
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s=raw_input()
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for s in s:
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dic[s] = dic.get(s,0)+1
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print '\n'.join(['%s,%s' % (k, v) for k, v in dic.items()])
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#----------------------------------------#
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Question:
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Please write a program which accepts a string from console and print it in reverse order.
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Example:
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If the following string is given as input to the program:
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rise to vote sir
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Then, the output of the program should be:
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ris etov ot esir
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Hints:
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Use list[::-1] to iterate a list in a reverse order.
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Solution:
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s=raw_input()
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s = s[::-1]
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print s
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#----------------------------------------#
20462312

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Question:
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Please write a program which accepts a string from console and print the characters that have even indexes.
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Example:
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If the following string is given as input to the program:
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H1e2l3l4o5w6o7r8l9d
20472321

2322+
Then, the output of the program should be:
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Helloworld
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Hints:
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Use list[::2] to iterate a list by step 2.
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Solution:
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s=raw_input()
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s = s[::2]
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print s
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#----------------------------------------#
20502335

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Question:
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Please write a program which prints all permutations of [1,2,3]
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Hints:
2343+
Use itertools.permutations() to get permutations of list.
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Solution:
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import itertools
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print list(itertools.permutations([1,2,3]))
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20522350
#----------------------------------------#
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Question:
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Write a program to solve a classic ancient Chinese puzzle:
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We count 35 heads and 94 legs among the chickens and rabbits in a farm. How many rabbits and how many chickens do we have?
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Hint:
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Use for loop to iterate all possible solutions.
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Solution:
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def solve(numheads,numlegs):
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ns='No solutions!'
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for i in range(numheads+1):
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j=numheads-i
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if 2*i+4*j==numlegs:
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return i,j
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return ns,ns
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numheads=35
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numlegs=94
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solutions=solve(numheads,numlegs)
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print solutions
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#----------------------------------------#
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