CHAPTER 13: MORE ISSUES IN INPUT/OUTPUT

EXAMPLE ON PAGE:434-435

In [ ]:
 
import sys
if(len(sys.argv)!=3):
    print "Improper number of arguments\n"
    sys.exit(0)
try:
    fs=open(sys.argv[1], "r")
except:
    sys.exit("Cannot open source file\n")
try:
    ft=open(sys.argv[2], "w")
except:
    fs.close()
    sys.exit("Cannot open source file\n")
ch=fs.readlines()
ft.writelines(ch)
fs.close()
ft.close()

EXAMPLE ON PAGE:437-438

In [15]:
 
try:
    fp=open('python.txt','w')
    while True:
        ch=fp.read(1)
        if not ch:
            break;
        print "%c" % (ch)
except:
    print "Error in reading file\n"  

Error in reading file

EXAMPLE ON PAGE:439

In [3]:
 
import tempfile
import win32api
import win32print
import sys

try:
    fp=open('poem.txt','r')                        #No need to open it
except:
    sys.exit("Cannot open file\n")
win32api.ShellExecute (
  0,
  "print",
  "poem.txt",
  '/d:"%s"' % win32print.GetDefaultPrinter (),
  ".",
  0
)
fp.close()
Out[3]:
42

EXAMPLE ON PAGE:440-441

In [11]:
 
import sys
ch = sys.stdin.read(1)
while (len(ch)>0):
    sys.stdout.write(ch)
    ch = sys.stdin.read(1)

EXAMPLE ON PAGE:442

In [1]:
 
for ch in range(0,256,1):
    print "%d %c\n" % (ch,ch)

0 

1 

2 

3 

4 

5 

6 

7 

8 

9 	

10 


11 

12 

13 

14 

15 

16 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

31 

32  

33 !

34 "

35 #

36 $

37 %

38 &

39 '

40 (

41 )

42 *

43 +

44 ,

45 -

46 .

47 /

48 0

49 1

50 2

51 3

52 4

53 5

54 6

55 7

56 8

57 9

58 :

59 ;

60 <

61 =

62 >

63 ?

64 @

65 A

66 B

67 C

68 D

69 E

70 F

71 G

72 H

73 I

74 J

75 K

76 L

77 M

78 N

79 O

80 P

81 Q

82 R

83 S

84 T

85 U

86 V

87 W

88 X

89 Y

90 Z

91 [

92 \

93 ]

94 ^

95 _

96 `

97 a

98 b

99 c

100 d

101 e

102 f

103 g

104 h

105 i

106 j

107 k

108 l

109 m

110 n

111 o

112 p

113 q

114 r

115 s

116 t

117 u

118 v

119 w

120 x

121 y

122 z

123 {

124 |

125 }

126 ~

127 

128 �

129 �

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