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1 Objective Questions |
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2 ------------------- |
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3 |
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4 .. A mininum of 8 questions here. |
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5 |
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6 1. What function is used to open a file? |
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7 |
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8 Answer: ``open`` |
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9 |
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10 #. The ``open`` function returns a |
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11 |
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12 a. string |
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13 #. list |
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14 #. file object |
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15 #. function |
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16 |
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17 Answer: file object |
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18 |
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19 #. ``open`` function opens a file by default in write mode. T or F? |
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20 |
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21 Answer: False |
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22 |
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23 #. The ``read`` method reads a file and returns the contents |
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24 |
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25 a. string |
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26 #. list |
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27 #. file object |
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28 #. None of the above |
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29 |
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30 Answer: string |
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31 |
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32 #. Given a file with ``hello.txt``, which looks like |
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33 :: |
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34 |
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35 Hello, World! |
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36 |
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37 What is the value of content, at the end of this code block:: |
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38 |
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39 f = open('hello.txt') |
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40 pre_content = f.read() |
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41 content = f.read() |
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42 f.close() |
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43 |
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44 Answer: It is a null string. |
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45 |
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46 #. The following code block prints each line of ``hello.txt``:: |
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47 |
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48 f = open('hello.txt') |
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49 for line in f.read(): |
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50 print line |
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51 |
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52 True or False? |
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53 |
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54 Answer: False |
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55 |
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56 #. Given a file with ``hello.txt``, which looks like |
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57 :: |
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58 |
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59 Hello, World! |
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60 |
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61 What is the output of :: |
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62 |
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63 f = open('hello.txt') |
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64 |
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65 for line in f: |
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66 print line |
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67 |
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68 for line in f: |
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69 print line |
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70 |
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71 f.close() |
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72 |
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73 Answer: Hello, World! is printed once. |
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74 |
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75 .. The actual answer should talk about blank lines, but I'm |
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76 .. not sure if we should get into such detail. |
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77 |
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78 .. Should this be made a multiple-choice? |
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79 |
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80 .. #[[Anoop: I think it will better if we make this multiple |
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81 choice]] |
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82 |
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83 #. Given a file with ``hello.txt``, which looks like |
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84 :: |
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85 |
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86 Hello, World! |
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87 |
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88 What is the output of :: |
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89 |
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90 f = open('hello.txt') |
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91 |
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92 for line in f: |
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93 print line |
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94 |
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95 f.close() |
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96 |
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97 for line in f: |
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98 print line |
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99 |
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100 f.close() |
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101 |
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102 Answer: Hello, World! is printed twice. |
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103 |
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104 #. Given a file with ``hello.txt``, which looks like |
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105 :: |
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106 |
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107 Hello, World! |
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108 |
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109 What is the output of :: |
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110 |
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111 f = open('hello') |
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112 |
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113 for line in f: |
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114 print line |
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115 |
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116 f.close() |
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117 |
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118 for line in f: |
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119 print line |
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120 |
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121 f.close() |
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122 |
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123 Answer: IOError - No such file or directory: 'hello' |
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124 |
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125 |
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126 Larger Questions |
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127 ---------------- |
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128 |
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129 .. A minimum of 2 questions here. |
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130 |
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131 1. What does ``f.read(size)`` do? |
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132 |
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133 #. Print every alternate line of a file, starting at the first line. |
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134 |
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135 #. Print the file in reverse. Starting from the last line to the |
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136 first. |