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‎100+ Python challenging programming exercises.txt‎

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#----------------------------------------#
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2.14
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Question:
1112+
Write a program which accepts a string as input to print "Yes" if the string is "yes" or "YES" or "Yes", otherwise print "No".
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1114+
Hints:
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1116+
Use if statement to judge condition.
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Solution
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s= raw_input()
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if s=="yes" or s=="YES" or s=="Yes":
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print "Yes"
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else:
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print "No"
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#----------------------------------------#
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3.4
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1130+
Question:
1131+
Write a program which can filter even numbers in a list by using filter function. The list is: [1,2,3,4,5,6,7,8,9,10].
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1133+
Hints:
1134+
1135+
Use filter() to filter some elements in a list.
1136+
Use lambda to define anonymous functions.
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Solution
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li = [1,2,3,4,5,6,7,8,9,10]
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evenNumbers = filter(lambda x: x%2==0, li)
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print evenNumbers
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1143+
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#----------------------------------------#
1145+
3.4
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Question:
1148+
Write a program which can map() to make a list whose elements are square of elements in [1,2,3,4,5,6,7,8,9,10].
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Hints:
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Use map() to generate a list.
1153+
Use lambda to define anonymous functions.
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Solution
1156+
li = [1,2,3,4,5,6,7,8,9,10]
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squaredNumbers = map(lambda x: x**2, li)
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print squaredNumbers
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1160+
#----------------------------------------#
1161+
3.5
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1163+
Question:
1164+
Write a program which can map() and filter() to make a list whose elements are square of even number in [1,2,3,4,5,6,7,8,9,10].
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1166+
Hints:
1167+
1168+
Use map() to generate a list.
1169+
Use filter() to filter elements of a list.
1170+
Use lambda to define anonymous functions.
1171+
1172+
Solution
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li = [1,2,3,4,5,6,7,8,9,10]
1174+
evenNumbers = map(lambda x: x**2, filter(lambda x: x%2==0, li))
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print evenNumbers
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1177+
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#----------------------------------------#
1181+
3.5
1182+
1183+
Question:
1184+
Write a program which can filter() to make a list whose elements are even number between 1 and 20 (both included).
1185+
1186+
Hints:
1187+
1188+
Use filter() to filter elements of a list.
1189+
Use lambda to define anonymous functions.
1190+
1191+
Solution
1192+
evenNumbers = filter(lambda x: x%2==0, range(1,21))
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print evenNumbers
1194+
1195+
1196+
#----------------------------------------#
1197+
3.5
1198+
1199+
Question:
1200+
Write a program which can map() to make a list whose elements are square of numbers between 1 and 20 (both included).
1201+
1202+
Hints:
1203+
1204+
Use map() to generate a list.
1205+
Use lambda to define anonymous functions.
1206+
1207+
Solution
1208+
squaredNumbers = map(lambda x: x**2, range(1,21))
1209+
print squaredNumbers
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1211+
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1213+
1214+
#----------------------------------------#
1215+
7.2
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Question:
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Define a class named American which has a static method called printNationality.
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1220+
Hints:
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1222+
Use @staticmethod decorator to define class static method.
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1224+
Solution
1225+
class American(object):
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@staticmethod
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def printNationality():
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print "America"
1229+
1230+
anAmerican = American()
1231+
anAmerican.printNationality()
1232+
American.printNationality()
1233+
1234+
1235+
1236+
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#----------------------------------------#
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1239+
7.2
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Question:
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Define a class named American and its subclass NewYorker.
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1244+
Hints:
1245+
1246+
Use class Subclass(ParentClass) to define a subclass.
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1248+
Solution:
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1250+
class American(object):
1251+
pass
1252+
1253+
class NewYorker(American):
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pass
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1256+
anAmerican = American()
1257+
aNewYorker = NewYorker()
1258+
print anAmerican
1259+
print aNewYorker
1260+
1261+
1262+
1263+
1264+
#----------------------------------------#
1265+
1266+
1267+
7.2
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Question:
1270+
Define a class named Circle which can be constructed by a radius. The Circle class has a method which can compute the area.
1271+
1272+
Hints:
1273+
1274+
Use def methodName(self) to define a method.
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1276+
Solution:
1277+
1278+
class Circle(object):
1279+
def __init__(self, r):
1280+
self.radius = r
1281+
1282+
def area(self):
1283+
return self.radius**2*3.14
1284+
1285+
aCircle = Circle(2)
1286+
print aCircle.area()
1287+
1288+
1289+
1290+
1291+
1292+
1293+
#----------------------------------------#
1294+
Define a class named Rectangle which can be constructed by a length and width. The Rectangle class has a method which can compute the area.
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1296+
Hints:
1297+
1298+
Use def methodName(self) to define a method.
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1300+
Solution:
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1302+
class Rectangle(object):
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def __init__(self, l, w):
1304+
self.length = l
1305+
self.width = w
1306+
1307+
def area(self):
1308+
return self.length*self.width
1309+
1310+
aRectangle = Rectangle(2,10)
1311+
print aRectangle.area()
1312+
1313+
1314+
1315+
1316+
#----------------------------------------#
1317+
Define a class named Shape and its subclass Square. The Square class has an init function which takes a length as argument. Both classes have a area function which can print the area of the shape where Shape's area is 0 by default.
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1319+
Hints:
1320+
1321+
To override a method in super class, we can define a method with the same name in the super class.
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Solution:
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1325+
class Shape(object):
1326+
def __init__(self):
1327+
pass
1328+
1329+
def area(self):
1330+
return 0
1331+
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class Square(Shape):
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def __init__(self, l):
1334+
Shape.__init__(self)
1335+
self.length = l
1336+
1337+
def area(self):
1338+
return self.length*self.length
1339+
1340+
aSquare= Square(3)
1341+
print aSquare.area()
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1343+
1344+
1345+
1346+
1347+
1348+
1349+
1350+
#----------------------------------------#
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#----------------------------------------#
11091359

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