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@@ -1,47 +1,62 b'' | |||
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1 | 1 | # encoding: utf-8 |
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2 | 2 | """ |
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3 | 3 | A simple utility to import something by its string name. |
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4 | 4 | |
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5 | 5 | Authors: |
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6 | 6 | |
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7 | 7 | * Brian Granger |
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8 | 8 | """ |
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9 | 9 | |
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10 | 10 | #----------------------------------------------------------------------------- |
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11 | 11 | # Copyright (C) 2008-2011 The IPython Development Team |
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12 | 12 | # |
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13 | 13 | # Distributed under the terms of the BSD License. The full license is in |
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14 | 14 | # the file COPYING, distributed as part of this software. |
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15 | 15 | #----------------------------------------------------------------------------- |
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16 | 16 | |
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17 | 17 | #----------------------------------------------------------------------------- |
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18 | 18 | # Functions and classes |
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19 | 19 | #----------------------------------------------------------------------------- |
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20 | 20 | |
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21 | 21 | def import_item(name): |
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22 |
"""Import and return bar given the string foo.bar. |
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22 | """Import and return ``bar`` given the string ``foo.bar``. | |
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23 | ||
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24 | Calling ``bar = import_item("foo.bar")`` is the functional equivalent of | |
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25 | executing the code ``from foo import bar``. | |
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26 | ||
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27 | Parameters | |
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28 | ---------- | |
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29 | name : string | |
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30 | The fully qualified name of the module/package being imported. | |
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31 | ||
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32 | Returns | |
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33 | ------- | |
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34 | mod : module object | |
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35 | The module that was imported. | |
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36 | """ | |
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37 | ||
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23 | 38 | package = '.'.join(name.split('.')[0:-1]) |
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24 | 39 | obj = name.split('.')[-1] |
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25 | 40 | |
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26 | 41 | # Note: the original code for this was the following. We've left it |
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27 | 42 | # visible for now in case the new implementation shows any problems down |
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28 | 43 | # the road, to make it easier on anyone looking for a problem. This code |
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29 | 44 | # should be removed once we're comfortable we didn't break anything. |
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30 | 45 | |
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31 | 46 | ## execString = 'from %s import %s' % (package, obj) |
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32 | 47 | ## try: |
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33 | 48 | ## exec execString |
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34 | 49 | ## except SyntaxError: |
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35 | 50 | ## raise ImportError("Invalid class specification: %s" % name) |
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36 | 51 | ## exec 'temp = %s' % obj |
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37 | 52 | ## return temp |
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38 | 53 | |
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39 | 54 | if package: |
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40 | 55 | module = __import__(package,fromlist=[obj]) |
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41 | 56 | try: |
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42 | 57 | pak = module.__dict__[obj] |
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43 | 58 | except KeyError: |
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44 | 59 | raise ImportError('No module named %s' % obj) |
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45 | 60 | return pak |
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46 | 61 | else: |
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47 | 62 | return __import__(obj) |
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