Source Code for Module basics.tuples

 1  """ 
 2  Python uses parentheses to enclose B{tuples}. 
 3   
 4     >>> X = (24, 3.14, 'w', 7) #  Tuple with 4 items 
 5     >>> Y = (100,)    # tuple with one item 
 6     >>> Z = () #empty tuple 
 7   
 8  The following is not a tuple: 
 9   
10     >>> Q = (7) 
11     >>> Q == 7 
12     True 
13   
14     >>> L = tuple('hi!')  # make a string a tuple 
15     >>> L 
16     ('h', 'i', '!') 
17     >>> M = tuple() 
18     >>> M 
19     () 
20      
21     >>> X(0)   # 1st element 
22     24 
23     >>> X(1)   # 2nd element 
24     3.1400000000000001 
25     >>> X(-1)   # last element 
26     7 
27     >>> X(0:2) # tuple of 1st and 2nd elements 
28     (24, 3.1400000000000001) 
29     >>> X(:-1) # tuple excluding last element 
30   
31  The following raises an IndexError 
32   
33     >>> X[4]   # Raises exception! 
34     ... 
35     IndexError: tuple index out of range 
36   
37  Concatenation of tuples: 
38   
39     >>> X + Y  
40     (24, 3.1400000000000001, 'w', 7, 100) 
41   
42  """ 
43   
44   
45 -def demo_tuples(): 
46      global X, Y, Z, L, M 
47       
48      X = (24, 3.14, 'w', 7) #  Tuple with 4 items 
49      Y = (100,)    # tuple with one item 
50      Z = () #empty tuple 
51   
52      L = tuple('hi!')  # make a string a tuple 
53      M = tuple() 
54   
55      X[0]   # 1st element 
56      X[1]   # 2nd element 
57      X[-1]   # last element 
58      X[0:2] # tuple of 1st and 2nd elements 
59      X[:-1] # tuple excluding last element 
60   
61       
62      X + Y # Concatenation! 
63   
64  if __name__ == '__main__': 
65      demo_tuples() 
66