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1 Objective Questions |
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2 ------------------- |
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3 |
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4 1. How do you retrieve the recent 5 commands |
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5 |
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6 a. ``%hist`` |
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7 #. ``%hist -5`` |
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8 #. ``%hist 5`` |
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9 #. ``%hist 5-10`` |
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10 |
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11 Answer: ``%hist 5`` |
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12 |
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13 2. If there were 20 commands typed and ``%hist`` is used. How many commands |
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14 will be displayed. |
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15 |
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16 a. 10 |
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17 #. 20 |
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18 #. 21 |
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19 #. 19 |
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20 |
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21 Answer: 21 |
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22 |
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23 3. is ``%hist`` considered as a command |
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24 |
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25 a. True |
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26 #. False |
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27 |
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28 Answer: True |
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29 |
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30 4. how do you retreive the commands from 20 to 50 (inclusive of 20 and 50) |
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31 |
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32 a. ``%hist 20 50`` |
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33 #. ``%hist 19 50`` |
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34 #. ``%hist 19 51`` |
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35 #. ``%hist 21 50`` |
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36 |
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37 Answer: ``%hist 20 50`` |
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38 |
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39 5. What does the ``%hist 2 5 7`` command do |
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40 |
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41 a. lists the second, fifth and seventh commands |
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42 #. lists the commands from 2 to 5 and the seventh command |
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43 #. raises an error |
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44 #. lists the commands 2 to 7 |
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45 |
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46 Answer: raises an error |
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47 |
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48 6. How many commands are displayed when lot of coomands were typed and |
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49 ``%hist`` is used. |
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50 |
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51 a. 20 |
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52 #. 10 |
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53 #. 50 |
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54 #. 40 |
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55 |
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56 Answer: 40 |
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57 |
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58 7. How do you save the lines 2 3 4 5 7 9 10 11 |
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59 |
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60 a. ``%save filepath 2-5 7 9-11`` |
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61 #. ``%save filepath 2-11`` |
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62 #. ``%save filepath`` |
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63 #. ``%save 2-5 7 9 10 11`` |
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64 |
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65 Answer: ``%save filepath 2-5 7 9-11`` |
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66 |
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67 8. You are working in /home/user. Where is the file saved when you do |
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68 ``%save hello.py 1-3`` |
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69 |
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70 a. /home/user/hello.py |
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71 #. /hello.py |
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72 #. /home/hello.py |
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73 #. /home/user/ipython/hello.py |
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74 |
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75 Answer: /home/user/hello.py |
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76 |
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77 9. Which lines are saved by the command ``%save filepath 2-5 7 1`` and in |
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78 which order |
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79 |
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80 a. 2 3 4 5 7 1 |
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81 #. 1 2 3 4 5 6 7 |
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82 #. 2 5 7 1 |
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83 #. 1 2 5 7 |
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84 |
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85 10. What happens when ``%save filepath line_numbers`` is used and a file |
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86 already exists in that path. |
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87 |
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88 a. It is overwritten |
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89 #. The commands are added to the file |
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90 #. It raises an error |
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91 #. A prompt to confirm overwriting is displayed |
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92 |
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93 Answer: A prompt to confirm overwriting is displayed |
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94 |
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95 11. Read through the documentation of ``%hist`` and find its alternative name |
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96 |
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97 Answer: ``%history`` |
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98 |
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99 12. Are ``%run /home/user/saved.py`` and ``%run /home/user/saved`` the same |
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100 |
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101 a. Yes |
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102 #. No |
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103 |
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104 Answer: Yes |
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105 |
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106 13. The file hello.py contains only one command ``x = x + 1``. What happens |
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107 when you do ``%run hello.py`` |
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108 |
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109 Answer: Raises a nameerror |
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110 |
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111 14. The file hello.py contains only one command ``x = x + 1``. If value of x |
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112 is 5 and what does ``%run -i hello.py`` do. |
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113 |
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114 a. raises an error |
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115 #. increments value of x by 1 |
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116 #. Does nothing |
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117 |
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118 Answer: increments the value of x by 1 |