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54 lines
1.4 KiB
54 lines
1.4 KiB
#!/usr/bin/ipython -pylab
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#
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# $Id: sugar.py,v 1.2 2010-02-08 19:58:44 wirawan Exp $
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#
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# Created: 20100121
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# Wirawan Purwanto
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#
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# Syntactic sugar for python programming. May not be efficient, but many
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# of these tools are nice for quick-and-dirty programming.
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# Beware of their caveats!
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#
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#
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import sys
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def ifelse(cond, trueval, *args):
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"""An alternative to python's own ternary operator, but with multiple
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conditions to test (like chained if-else-if-else... which is found in
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e.g. m4 language).
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This is of course only a syntactic sugar with its inefficiency and
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dangers (all expressions are evaluated before choosing which one is to
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select). So, beware!"""
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if cond:
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return trueval
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else:
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i = 0
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while i+1 < len(args):
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if args[i]: return args[i+1]
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i += 2
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if i < len(args): return args[i]
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return None # Fallback solution: "None"
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if sys.version_info < (2,4):
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def sorted(List):
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rslt = [ L for L in List ] # == L.copy()
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rslt.sort()
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return rslt
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else:
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#print dir(globals())
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sorted = sorted
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#print dir(globals())
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def dict_slice(Dict, *keys):
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"""Returns a shallow copy of the subset of a given dict (or an otherwise
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hashable object) with a given set of keys.
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Example: if d = {'abc': 12, 'def': 7, 'ghi': 32, 'jkl': 98 }
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then dict_slice(d, 'abc', 'ghi') will yield {'abc': 12, 'ghi': 32 }
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"""
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return dict([ (k, Dict[k]) for k in keys ])
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