Introduction to Computing Using Python

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Introduction to Computing Using Python - An Application Development Focus (Ljubomir Perkovic)



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Introduction to Computing Using Python
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关键词：introduction troduction computing Comput python

1. def temperature(t):
   
2.     'prints message based on temperature value t'
   
3.     if t > 86:
   
4.         print('It is hot!')
   
5.     elif t > 32:
   
6.         print('It is cool.')
   
7.     else:                        # t <= 32
   
8.         print('It is freezing!')
   
9. 
   
10. 
    
11. 
    
12. def sorted(lst):
    
13.     'returns True if sequence lst is increasing, False otherwise'
    
14.     for i in range(0, len(lst)-1): # i = 0, 1, 2, ..., len(lst)-2
    
15.         if lst[i] > lst[i+1]:
    
16.             return False
    
17.     return True
    
18. 
    
19. 
    
20. 
    
21. def nested(n):
    
22.     'prints n lines each containing values 0 1 2 ... n-1'
    
23.     for j in range(n):          # repeat n times:
    
24.         for i in range(n):          # print 0, 1, ..., n-1
    
25.             print(i, end=" ")
    
26.         print()                # move cursor to next line
    
27. 
    
28. 
    
29. 
    
30. def nested2(n):
    
31.     'prints n lines 0 1 2 ... j for j = 0, 1, ..., n-1'
    
32.     for j in range(n):       # j = 0, 1, ..., n-1
    
33.         for i in range(j+1):    # print 0 1 2 ... j
    
34.             print(i, end=" ")
    
35.         print()                 # move to next line
    
36. 
    
37. 
    
38. def print2D(t):
    
39.     'prints values in 2D list t as a 2D table'
    
40.     for row in t:
    
41.         for item in row:         # print item followed by
    
42.             print(item, end=' ')     # a blank space
    
43.         print()                  # move to next line
    
44. 
    
45. 
    
46. def incr2D(t):
    
47.     'increments each number in 2D list of numbers t'
    
48.     nrows = len(t)                   # number of rows
    
49.     ncols = len(t[0])                # number of columns
    
50. 
    
51.     for i in range(nrows):           # i is the row index
    
52.         for j in range(ncols):           # j is the column index
    
53.             t[i][j] += 1
    
54. 
    
55. 
    
56. 
    
57. def fibonacci(bound):
    
58.     'returns the smallest Fibonacci number greater than bound'
    
59.     previous = 1        # first Fibonacci number
    
60.     current = 1                # second Fibonacci number
    
61.     while current <= bound:
    
62.         # current becomes previous, and new current is computed
    
63.         previous, current = current, previous+current
    
64.     return current
    
65. 
    
66. 
    
67. 
    
68. def hello2():
    
69.     '''a greeting service; it repeatedly requests the name
    
70.        of the user and then greets the user'''
    
71.     while True:
    
72.         name = input('What is your name? ')
    
73.         print('Hello {}'.format(name))
    
74. 
    
75. 
    
76. 
    
77. def cities():
    
78.     '''returns the list of cities that are interactively entered
    
79.        by the user; the empty string ends the interactive input'''
    
80.     lst = []
    
81.    
    
82.     city = input('Enter city: ')   # ask user to enter first city
    
83. 
    
84.     while city != '':              # if city is not the flag value
    
85.         lst.append(city)           # append city to list
    
86.         city = input('Enter city: ')   # and ask user once again
    
87. 
    
88.     return lst
    
89. 
    
90. 
    
91. 
    
92. def cities2():
    
93.     '''returns the list of cities that are interactively entered
    
94.        by the user; the empty string ends the interactive input'''
    
95.     lst = []
    
96. 
    
97.     while True:                  # forever repeat:
    
98.         city = input('Enter city: ') # ask user to enter city
    
99. 
    
100.         if city == '':               # if city is the flag value
     
101.             return lst                   # return list
     
102. 
     
103.         lst.append(city)             # append city to list
     
104. 
     
105. 
     
106. 
     
107. def print2D2(table):
     
108.     'prints values in 2D list of numbers t as a 2D table'
     
109.     for row in table:
     
110.         for entry in row:
     
111.             print(entry, end=' ')
     
112.         print()
     
113. 
     
114. 
     
115. 
     
116. def before0(table):
     
117.     '''prints values in 2D list of numbers t as a 2D table;
     
118.        only values in row up to first 0 are printed'''
     
119.     for row in table:
     
120. 
     
121.         for num in row:     # inner for loop
     
122.             if num == 0:        # if num is 0
     
123.                 break           # terminate inner for loop
     
124.             print(num, end=' ') # otherwise print num
     
125. 
     
126.         print()             # move cursor to next line
     
127. 
     
128. 
     
129. 
     
130. def ignore0(table):
     
131.     '''prints values in 2D list of numbers t as a 2D table;
     
132.        0 values are no printed'''
     
133.     for row in table:
     
134. 
     
135.         for num in row:     # inner for loop
     
136.             if num == 0:        # if num is 0, terminate
     
137.                 continue        # current inner loop iteration
     
138.             print(num, end=' ') # otherwise print num
     
139. 
     
140.         print()             # move cursor to next line

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1. # Practice Problem 5.1
   
2. def myBMI(weight, height):
   
3.   'prints BMI report'
   
4.   bmi = weight * 703 / height**2
   
5.   if bmi < 18.5:
   
6.     print('Underweight')
   
7.   elif bmi < 25:
   
8.     print('Normal')
   
9.   else:                        # bmi >= 25
   
10.     print('Overweight')

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1. # Practice Problem 5.2
   
2. def powers(n):
   
3.     'prints 2**i for i = 1, 2, ..., n'
   
4.     for i in range(1, n+1):
   
5.         print(2**i, end=' ')

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1. # Practice Problem 5.3
   
2. def arithmetic(lst):
   
3.     '''returns True if list lst contains an arithmetic sequence,
   
4.        False otherwise'''
   
5.     if len(lst) < 2: # a sequence of length < 2 is arithmetic
   
6.         return True
   
7.    # checking that difference between successive items is equal
   
8.    # to the difference between the first two numbers
   
9.     diff = lst[1] - lst[0]
   
10.     for i in range(1, len(lst)-1):
    
11.         if lst[i+1] - lst[i] != diff:
    
12.             return False
    
13.     return True

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1. # Practice Problem 5.4
   
2. def factorial(n):
   
3.     'returns n!'
   
4.     res = 1
   
5.     for i in range(2, n+1):
   
6.         res *= i
   
7.     return res

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1. # Practice Problem 5.5
   
2. def acronym(phrase):
   
3.     'returns the acronym of the input string phrase'
   
4.     # splits phrase into a list of words
   
5.     words = phrase.split()
   
6.     # accumulate first character, as an uppercase, of every word
   
7.     res = ''
   
8.     for w in words:
   
9.         res = res + w[0].upper()
   
10.     return res

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1. # Practice Problem 5.6
   
2. def divisors(n):
   
3.     'returns the list of divisors of n'
   
4.     res = []
   
5.     for i in range(1, n+1):
   
6.         if n % i == 0:
   
7.             res.append(i)
   
8.     return res

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1. # Practice Problem 5.7
   
2. def xmult(l1,l2):
   
3.     '''returns the list of products of items in list l1
   
4.        with items in list l2'''
   
5.     l = []
   
6.     for i in l1:
   
7.         for j in l2:
   
8.             l.append(i*j)
   
9.     return l

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1. # Practice Problem 5.8
   
2. def bubblesort(lst):
   
3.     'sorts list lst in nondecreasing order'
   
4.     for i in range(len(lst)-1, 0, -1):
   
5.         # perform pass that ends at
   
6.         # i = len(lst)-1, len(lst)-2, ..., 1
   
7.         for j in range(i):
   
8.             # compare items at index j and j+1
   
9.             # for every j = 0, 1, ..., i-1
   
10.             if lst[j] > lst[j+1]:
    
11.                 # swap numbers at index j and j+1
    
12.                 lst[j], lst[j+1] = lst[j+1], lst[j]

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