Conditional structures: Difference between revisions
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dispatcher[1]=bar |
dispatcher[1]=bar |
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dispatcher[2]=baz # foo,bar, baz, and boz are defined functions. |
dispatcher[2]=baz # foo,bar, baz, and boz are defined functions. |
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# Then later |
# Then later |
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results = dispatcher.get(x, boz)() # binding results to a name is optional |
results = dispatcher.get(x, boz)() # binding results to a name is optional |
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if x in dispatcher: |
if x in dispatcher: |
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results=dispatcher[x]()</lang> |
results=dispatcher[x]()</lang> |
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<lang python># The above, but with a dict literal |
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dispatcher = { |
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0: foo, |
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1: bar, |
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2: baz, |
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} |
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# ... |
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dispatcher.get(x, boz)()</lang> |
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<lang python># Or without the temp variable |
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# (it's up to the reader to decide how "pythonic" this is or isn't) |
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{ |
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0: foo, |
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1: bar, |
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2: baz, |
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}.get(x, boz)()</lang> |
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This can be particularly handy when using [[wp:Currying|currying]] techniques, or when lambda expressions or meta-function generators (factories) can be used in place of normal named functions. |
This can be particularly handy when using [[wp:Currying|currying]] techniques, or when lambda expressions or meta-function generators (factories) can be used in place of normal named functions. |
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