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python Programming Glossary: keyfuncPython class to merge sorted files, how can this be improved? http://stackoverflow.com/questions/1001569/python-class-to-merge-sorted-files-how-can-this-be-improved tuple. for line in f yield key line line def standard_keyfunc line The standard key function in my application. return line.split.. .lower def mergeSortedFiles paths output_path dedup True keyfunc standard_keyfunc Does the same thing SortedFileMerger class.. paths output_path dedup True keyfunc standard_keyfunc Does the same thing SortedFileMerger class does. files map open..
http://stackoverflow.com/questions/2609518/python-nested-function-scopes updating the displayed # status of the sort. ctr 0 def keyfunc x ctr 1 status POSTCODE Sorting postcodes ctr len self.postcodes.. return x sort_res self.postcodes sort_res.sort key keyfunc But ctr responds with a NameError Traceback most recent call.. line 47 in write_postcodes sort_res.sort key keyfunc File PostcodeWriter.py line 43 in keyfunc ctr 1 UnboundLocalError..
How do I use Python's itertools.groupby()? http://stackoverflow.com/questions/773/how-do-i-use-pythons-itertools-groupby construction groups uniquekeys for k g in groupby data keyfunc groups.append list g # Store group iterator as a list uniquekeys.append..
Chunking data from a large file for multiprocessing? http://stackoverflow.com/questions/8717179/chunking-data-from-a-large-file-for-multiprocessing use reader csv.reader f chunks itertools.groupby reader keyfunc to split the file into processable chunks and groups list chunk.. your real computation # print chunk return len chunk def keyfunc row # `row` is one row of the CSV file. # replace this with.. as f reader csv.reader f chunks itertools.groupby reader keyfunc while True # make a list of num_chunks chunks groups list chunk..
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