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@kerspoon kerspoon/pymisc.py
Created Nov 16, 2009

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Python Utilities - replaced by `defaultdict` and `join`
#! /usr/bin/env python
# Python Utilities - replaced by `defaultdict` and `join`
import csv
import sys
from itertools import islice
# ---------------------------------------------------------------------------- #
# countedadd :: {set(T)=int}, set(T) -> {set(T)=int}
def countedadd(database,sample):
"""remove all duplicates by adding to a database"""
if frozenset(sample) in database:
database[frozenset(sample)] += 1
else:
database[frozenset(sample)] = 1
return database
# ---------------------------------------------------------------------------- #
# n_unique :: (set(T)), int, {set(T)=int} -> {frozenset(T)=int}
def n_unique(func,iterations,database={}):
"""grab N from the generator 'func' and remove the duplicates"""
smp = islice(func,iterations)
return reduce(countedadd,smp,database)
# ---------------------------------------------------------------------------- #
# as_csv :: [T], str -> str
def as_csv(iterable,sep = ", "):
"""a string of each item seperated by commas"""
iterable = list(iterable)
res = ""
if len(iterable) == 0:
return ""
for item in iterable[:-1]:
res += str(item) + sep
return res + str(iterable[len(iterable)-1])
# ---------------------------------------------------------------------------- #
# csv_print :: [T], str -> None
def csv_print(iterable,sep = ", "):
"""print each item seperated by commas"""
print as_csv(iterable,sep)
# ---------------------------------------------------------------------------- #
# dict_inc :: [T1 = T2], T1, T2 -> None
def dict_inc(dictionary,key,value):
"""increment a value in a dictionary
or set it if not already done"""
if key in dictionary:
dictionary[key] += value
else:
dictionary[key] = value
# ---------------------------------------------------------------------------- #
# dict_get :: [T1 = T2], T1, T2 -> T2
def dict_get(dictionary,key,default=0):
"""get a value from a dict or return default"""
if key in dictionary:
return dictionary[key]
else:
return default
# ---------------------------------------------------------------------------- #
# dict_sort_by_values :: {T1 = T2} -> [(T1, T2)]
def dict_sort_by_values(dictionary):
def by_values(first,second):
return cmp(second[1],first[1])
return sorted(dictionary.items(), by_values)
# ---------------------------------------------------------------------------- #
# each_with_each_other [T], (T, T -> None) -> None
def each_with_each_other(iterable,func):
for N,first in enumerate(iterable):
for second in iterable[N+1:]:
func(first,second)
# ---------------------------------------------------------------------------- #
# ---------------------------------------------------------------------------- #
def TEST_dict_sort_by_values():
print dict_sort_by_values(dict(a=2,b=1,c=7,d=0))
# TEST_dict_sort_by_values()
def TEST_each_with_each_other():
def testprint(first,second):
print first, second
each_with_each_other([1,2,3,4,5],testprint)
# TEST_each_with_each_other()
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