# _*_ coding:utf-8 _*_ """ This file is some operator about dict cited: https://stackoverflow.com/questions/613183/how-to-sort-a-dictionary-by-value https://stackoverflow.com/questions/72899/how-do-i-sort-a-list-of-dictionaries-by-values-of-the-dictionary-in-python http://pythoncentral.io/how-to-sort-python-dictionaries-by-key-or-value/ https://stackoverflow.com/questions/20464368/sort-a-dictionary-by-length-of-the-value """ import operator from collections import OrderedDict def lst_2_dict(): """ combine two list to dict :return: """ lst1 = ['a', 'b', 'c'] lst2 = [1, 2, 3] # d = {k: v for k, v in zip(lst1, lst2)} d = dict(zip(lst1, lst2)) print d # {'a': 1, 'c': 3, 'b': 2} # d.pop('a') del d['a'] print d def iter_dict(): """ RuntimeError: dictionary changed size during iteration iteration del error """ d_info = {'aa': -1, 'bb': 0, 'cc': 1, 'dd': 2} for key in d_info.iterkeys(): print key, d_info[key] if d_info[key] < 0: # RuntimeError: dictionary changed size during iteration d_info.pop(key) # del d_info[key] pass print 'after del' for key in d_info.iterkeys(): print key, d_info[key] def iter_dict_remove(): """remove item in dict while iteration it""" d_info = {'aa': -1, 'bb': 0, 'cc': 1, 'dd': 2} # right way # for k, v in d_info.items(): # print k, v # if v < 0: # del d_info[k] for k in d_info.keys(): print k, d_info[k] if d_info[k] < 0: del d_info[k] print 'after del' for key in d_info.iterkeys(): print key, d_info[key] def iter_dic_sort(): """iter dict by sorted keys""" d_info = {'33': 33, '88': 88, '22': 22, '44': 44} for k in sorted(d_info): print k, d_info[k] def dict_sort_by_value(): dic_num = {'first': 11, 'second': 2, 'third': 33, 'Fourth': 4} # print all the keys print dic_num.keys() print list(dic_num) # ['second', 'Fourth', 'third', 'first'] # print all the sorted keys print sorted(dic_num) # ['Fourth', 'first', 'second', 'third'] print sorted(dic_num, key=str.lower) # ['first', 'Fourth', 'second', 'third'] # print sorted values print sorted(dic_num.values()) # [2, 4, 11, 33] # sorted by value sorted_val = sorted(dic_num.items(), key=operator.itemgetter(1)) # [('second', 2), ('Fourth', 4), ('first', 11), ('third', 33)] print sorted_val # sorted by key sorted_key = sorted(dic_num.items(), key=operator.itemgetter(0)) print sorted_key # [('Fourth', 4), ('first', 11), ('second', 2), ('third', 33)] dic_k_lst = {'11': [1, 2], 'ab': [3], 'cd': [0, -1, 2]} # Sort a dictionary by length of the value print sorted(dic_k_lst.items(), key=lambda item: len(item[1])) # [('ab', [3]), ('11', [1, 2]), ('cd', [0, -1, 2])] dic_k_set = {'11': {1, 2}, 'ab': {3}, 'cd': {0, -1, 2}} # Sort a dictionary by length of the value d_val_len = sorted(dic_k_set.items(), key=lambda item: len(item[1])) print d_val_len # [('ab', set([3])), ('11', set([1, 2])), ('cd', set([0, 2, -1]))] print d_val_len[0][1] # set([3]) print len(d_val_len[0][1]) # 1 (长度为 1) def dic_to_lst(): dic_k_lst = {'11': [1, 2], 'ab': [3], 'cd': [0, -1, 2]} lst = [(k, len(dic_k_lst[k])) for k in dic_k_lst.keys()] print lst # [('11', 2), ('ab', 1), ('cd', 3)] def dic_count_value(): from collections import Counter dic_k_lst = {'11': None, 'ab': 3, 'name': 'xy', 'none': None, 'age': 26} print Counter(dic_k_lst.values()) # Counter({None: 2, 'xy': 1, 26: 1, 3: 1}) count_none = 0 count_not_none = 0 for k in dic_k_lst.keys(): if dic_k_lst[k] is None: count_none += 1 else: count_not_none += 1 print count_none, count_not_none # 2 3 def count_val_lst_len(): d = {'T1': ['eggs', 'bacon', 'sausage'], 'T2': ['spam', 'ham', 'monty', 'python']} print map(len, d.values()) # [4, 3] print sum(map(len, d.values())) # 7 def sum_dic_val(): d_info = {'33': 1, '88': 2, '22': 3, '44': 4} print sum(d_info.values()) # 10 def dict_pop(): dic_k_lst = {'11': {1, 2}, 'ab': [3], 'cd': [0, -1, 2]} s1 = dic_k_lst['11'] print s1 # set([1, 2]) # del dic_k_lst['11'] dic_k_lst.pop('11') print s1 # set([1, 2]) print dic_k_lst # {'ab': [3], 'cd': [0, -1, 2]} def dic_val_lst(): dic_k_lst = {'11': [1, 2], 'ab': [3], 'cd': [0, -1, 2]} dic_k = {} for k, v in dic_k_lst.items(): for item in v: dic_k[item] = k print dic_k def dic_probability(): p = {1: {1: 0.1, 2: 0.3}, 2: {1: 0.1, 2: 0.3}} # {1: {1: 0.1, 2: 0.3}, 2: {1: 0.1, 2: 0.3}} print p[2], p[2][2] # {1: 0.1, 2: 0.3} 0.3 if __name__ == '__main__': # dic_val_lst() # dict_pop() # sum_dic_val() # count_val_lst_len() # dic_count_value() # dic_to_lst() # dict_sort_by_value() # lst_2_dict() # iter_dict() # iter_dic_sort() iter_dict_remove() s_lst={} s_lst['worker_1'] = [1, 2, 3] s_lst['worker_2'] = [1, 2, 3] # s_lst['worker_2'] = [1, 2, 3] # print s_lst # s_lst.pop('worker_1') # print s_lst # d_info = {} # if d_info is None: # print 'none' # else: # # 0 # print len(d_info) # lst = [1, 2, 3] pass