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1 | { | |
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2 | "metadata": { | |
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3 | "name": "Capturing Output" | |
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4 | }, | |
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5 | "nbformat": 3, | |
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6 | "worksheets": [ | |
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7 | { | |
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8 | "cells": [ | |
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9 | { | |
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10 | "cell_type": "heading", | |
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11 | "level": 1, | |
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12 | "source": [ | |
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13 | "Capturing Output with <tt>%%capture</tt>" | |
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14 | ] | |
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15 | }, | |
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16 | { | |
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17 | "cell_type": "markdown", | |
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18 | "source": [ | |
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19 | "One of IPython's new cell magics is `%%capture`, which captures stdout/err for a cell,", | |
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20 | "and discards them or stores them in variables in your namespace." | |
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21 | ] | |
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22 | }, | |
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23 | { | |
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24 | "cell_type": "code", | |
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25 | "input": [ | |
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26 | "import sys" | |
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27 | ], | |
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28 | "language": "python", | |
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29 | "outputs": [] | |
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30 | }, | |
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31 | { | |
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32 | "cell_type": "markdown", | |
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33 | "source": [ | |
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34 | "By default, it just swallows it up. This is a simple way to suppress unwanted output." | |
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35 | ] | |
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36 | }, | |
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37 | { | |
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38 | "cell_type": "code", | |
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39 | "input": [ | |
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40 | "%%capture", | |
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41 | "print 'hi, stdout'", | |
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42 | "print >> sys.stderr, 'hi, stderr'" | |
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43 | ], | |
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44 | "language": "python", | |
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45 | "outputs": [] | |
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46 | }, | |
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47 | { | |
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48 | "cell_type": "markdown", | |
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49 | "source": [ | |
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50 | "If you specify `-o` or `-e`, then stdout and/or stderr will be stored in those variables in your namespace." | |
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51 | ] | |
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52 | }, | |
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53 | { | |
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54 | "cell_type": "code", | |
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55 | "input": [ | |
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56 | "%%capture -o my_stdout", | |
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57 | "print 'hi, stdout'", | |
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58 | "print >> sys.stderr, 'hi, stderr'" | |
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59 | ], | |
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60 | "language": "python", | |
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61 | "outputs": [] | |
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62 | }, | |
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63 | { | |
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64 | "cell_type": "code", | |
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65 | "input": [ | |
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66 | "my_stdout" | |
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67 | ], | |
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68 | "language": "python", | |
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69 | "outputs": [] | |
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70 | }, | |
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71 | { | |
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72 | "cell_type": "code", | |
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73 | "input": [ | |
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74 | "%%capture -o my_stdout2 -e my_stderr", | |
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75 | "print 'hi again, stdout'", | |
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76 | "print >> sys.stderr, 'hi there, stderr'" | |
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77 | ], | |
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78 | "language": "python", | |
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79 | "outputs": [] | |
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80 | }, | |
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81 | { | |
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82 | "cell_type": "code", | |
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83 | "input": [ | |
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84 | "sys.stdout.write(my_stdout2)", | |
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85 | "sys.stderr.write(my_stderr)" | |
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86 | ], | |
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87 | "language": "python", | |
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88 | "outputs": [] | |
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89 | }, | |
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90 | { | |
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91 | "cell_type": "markdown", | |
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92 | "source": [ | |
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93 | "`%%capture` only captures stdout/err, not displaypub, so you can still do plots and use the display protocol inside %%capture" | |
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94 | ] | |
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95 | }, | |
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96 | { | |
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97 | "cell_type": "code", | |
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98 | "input": [ | |
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99 | "%pylab inline" | |
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100 | ], | |
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101 | "language": "python", | |
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102 | "outputs": [] | |
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103 | }, | |
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104 | { | |
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105 | "cell_type": "code", | |
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106 | "input": [ | |
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107 | "%%capture -o wontshutup", | |
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108 | "", | |
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109 | "print \"setting up X\"", | |
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110 | "x = np.linspace(0,5,1000)", | |
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111 | "print \"step 2: constructing y-data\"", | |
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112 | "y = np.sin(x)", | |
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113 | "print \"step 3: display info about y\"", | |
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114 | "plt.plot(x,y)", | |
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115 | "print \"okay, I'm done now\"" | |
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116 | ], | |
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117 | "language": "python", | |
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118 | "outputs": [] | |
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119 | }, | |
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120 | { | |
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121 | "cell_type": "code", | |
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122 | "input": [ | |
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123 | "print wontshutup" | |
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124 | ], | |
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125 | "language": "python", | |
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126 | "outputs": [] | |
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127 | } | |
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128 | ] | |
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129 | } | |
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130 | ] | |
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131 | } No newline at end of file | |
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