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python Programming Glossary: dict.fromkeysHow expensive are Python dictionaries to handle? http://stackoverflow.com/questions/1418588/how-expensive-are-python-dictionaries-to-handle loops best of 3 0.109 usec per loop python mtimeit s'empty dict.fromkeys range 7 ' '23 in empty' 10000000 loops best of 3 0.0933 usec.. loops best of 3 0.25 usec per loop python mtimeit s'empty dict.fromkeys range 7 ' '5 in empty' 10000000 loops best of 3 0.0921 usec..
Python Dictionary Comprehension http://stackoverflow.com/questions/14507591/python-dictionary-comprehension share improve this question You can use the dict.fromkeys class method ... dict.fromkeys range 1 11 True 1 True 2 True.. question You can use the dict.fromkeys class method ... dict.fromkeys range 1 11 True 1 True 2 True 3 True 4 True 5 True 6 True 7.. thing. Be careful using this with mutable objects though d dict.fromkeys range 10 d 1 .append 2 print d 2 # If you don't actually need..
dict.fromkeys all point to same list http://stackoverflow.com/questions/15516413/dict-fromkeys-all-point-to-same-list all point to same list This was causing me a bit of grief..... I created a dictionary from a list l 'a' 'b' 'c' d dict.fromkeys l 0 0 # initializing dictionary with 0 0 as values d 'a' is..
How to initialize a dict with keys from a list and empty value in Python? http://stackoverflow.com/questions/2241891/how-to-initialize-a-dict-with-keys-from-a-list-and-empty-value-in-python 3 None dictionary python share improve this question dict.fromkeys 1 2 3 4 This is actually a classmethod so it works for dict..
Python performance: Try-except or not in? http://stackoverflow.com/questions/3111195/python-performance-try-except-or-not-in dil.py file as follows def make percentmissing global d d dict.fromkeys range 100 percentmissing 1 def addit d k d k k def with_in dc..
Remove specific characters from a string in python http://stackoverflow.com/questions/3939361/remove-specific-characters-from-a-string-in-python string you would call something like translation_table dict.fromkeys map ord ' @# ' None unicode_line unicode_line.translate translation_table.. unicode_line unicode_line.translate translation_table Here dict.fromkeys and map are used to succinctly generate a dictionary containing..
Computing an md5 hash of a data structure http://stackoverflow.com/questions/5417949/computing-an-md5-hash-of-a-data-structure ... k i i for i in range 1000 ... random.shuffle k ... d dict.fromkeys k 1 ... p pickle.dumps d ... print hashlib.md5 p .hexdigest..
How do I write a setup.py for a twistd/twisted plugin that works with setuptools, distribute, etc? http://stackoverflow.com/questions/7275295/how-do-i-write-a-setup-py-for-a-twistd-twisted-plugin-that-works-with-setuptools _hacked_write_toplevel_names cmd basename filename pkgs dict.fromkeys _top_level_package k for k in cmd.distribution.iter_distribution_names..
Python sets are not json serializable http://stackoverflow.com/questions/8230315/python-sets-are-not-json-serializable regular lists if you convert sets to a dictionary using dict.fromkeys s the you lose the ability to recover dictionaries . A more..
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