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Python - Add new entries to dictionary while iterating over another dictionary


By : Rikikakaronaldo7
Date : July 31 2020, 05:00 AM
Any of those help I want to check if there is an overlap between points in one dictionary with another. If there is no overlap, then create a new key in the dictionary with the value. I am getting an error while implementing the following code. , I believe you are looking for dict.update():
code :
d1 = {'foo': 0,
      'bar': 1}

d2 = {'foo': 0,
      'bar': 1,
      'baz': 2}

d1.update(d2)
d1 = {'foo': 0,
      'bar': 1,
      'baz': 2}
import itertools

d1 = {"file1":[2,3],
      "file2":[11,15]}
d2 = {1:[1,5],
      2:[6,10]}

d2 = {**d2, **{max(d2.keys())+i+1: v for i, (k, v) in enumerate({k: v for k, v in d1.items() if not any(i in range(v[0], v[1]+1) for i in itertools.chain.from_iterable(range(v[0], v[1]+1) for v in d2.values()))}.items())}}
d2 = {1: [1, 5],
      2: [6, 10],
      3: [11, 15]}


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Python Dictionary of classes appending values assigns to all dictionary entries


By : Manuel Mejia
Date : March 29 2020, 07:55 AM
this one helps. These lists are created once, on class definition, and therefore are shared by all instances. You wanted:
code :
class Reaction:
    def __init__(self, bkm_id, ec_nums=None, b_ids=None, k_ids=None, m_ids=None, source = '')
        self.bkm_id = bkm_id
        self.ec_nums = ec_nums
        self.b_ids = b_ids or []
        self.k_ids = k_ids or []
        self.m_ids = m_ids or []
        self.source = source

        self.substrates = []
        self.products = []

    def add_metabolite(self, metabolite, stoichiometry, subs_prod):
        if subs_prod == 'S':
            self.substrates.append(Substrate_Product(metabolite, stoichiometry))
        elif subs_prod == 'P':
            self.products.append(Substrate_Product(metabolite, stoichiometry)) 

Iterating over a large dictionary (over 2 billion entries) using python


By : user2262574
Date : March 29 2020, 07:55 AM
This might help you I am very new to python and I want to loop through a dictionary that contains around 2 billion entries. using:
code :
for key,value in edge_dict.iteritems():
for i in range (2000000000)
for i in xrange(2000000000)

Combine dictionary entries into new dictionary entry based on similar keys with python


By : Matthew Thode
Date : March 29 2020, 07:55 AM
I wish this helpful for you I've got the following dictionaries: , You can use itertools.groupby:
code :
import itertools
d = [{'grade': '7', 'current_student_sum': 1559}, {'grade': '8', 'current_student_sum': 1638}, {'grade': 'KF', 'current_student_sum': 1588},{'grade': 'KA', 'current_student_sum': 1588}, {'grade': 'PA', 'current_student_sum': 366}, {'grade': 'PF', 'current_student_sum': 54}, {'grade': 'PP', 'current_student_sum': 384}]
new_d = [[a, list(b)] for a, b in itertools.groupby(sorted(d, key=lambda x:x['grade'][0]), key=lambda x:x['grade'][0])]
final_grade = [{'grade':a, 'current_student_sum':sum(i['current_student_sum'] for i in b)} for a, b in new_d]
[{'grade': '7', 'current_student_sum': 1559}, 
 {'grade': '8', 'current_student_sum': 1638}, 
 {'grade': 'K', 'current_student_sum': 3176}, 
 {'grade': 'P', 'current_student_sum': 804}]

conditionally adding dictionary entries from a second dictionary to a new dictionary while preserving new dictionary key


By : user3658473
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , If I understand you correctly, you want to update dict2 if the item in list1 is in dict1 using the corresponding key in list2.
You can zip the lists and iterate over the keys in both lists, setting the value using a conditional statement.
code :
dict1 = {'a':1,'b':2,'d':4}
dict2 = {'p':'blank','q':'blank','r':'blank','s':'blank'}
list1 = ['a','b','c','d']
list2 = ['p','q','r','s']

for a, b in zip(list1, list2):
    dict2[b] = dict1[a] if a in dict1 else 'blank'

print(dict2)
{'p': 1, 'q': 2, 'r': 'blank', 's': 4}
dict2.update({b : dict1[a] if a in dict1 else 'blank' for a,b in zip(list1, list2)})

Python script struck while creating dictionary as for each key of dictionary , there are multiple values( 300 entries) l


By : boreas
Date : March 29 2020, 07:55 AM
wish helps you I am a beginner. I have written a script which take input list of 10 million entries (in the form of a:b where a and b are alphanumeric). , I suspect the problem is here:
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