Python implements the merge of two dictionaries (dict), pythondict

Python implements the merge of two dictionaries (dict), pythondict

This article describes how to merge two dictionaries (dict) in Python. The specific method is as follows:

Two existing dictionaries, dict, are as follows:

dict1={1:[1,11,111],2:[2,22,222]}dict2={3:[3,33,333],4:[4,44,444]}

Merge the two dictionaries to get a similar result:

{1:[1,11,111],2:[2,22,222],3:[3,33,333],4:[4,44,444]}

Method 1:

dictMerged1=dict(dict1.items()+dict2.items())

Method 2:

dictMerged2=dict(dict1, **dict2)

Method 2 is equivalent:

dictMerged=dict1.copy()dictMerged.update(dict2)

Or:

dictMerged=dict(dict1)dictMerged.update(dict2)

Method 2 is much faster than method 1. The timeit test is as follows:

$ python -m timeit -s 'dict1=dict2=dict((i,i) for i in range(100))' 'dictMerged1=dict(dict1.items()+dict2.items())'  10000 loops, best of 3: 20.7 usec per loop$ python -m timeit -s 'dict1=dict2=dict((i,i) for i in range(100))' 'dictMerged2=dict(dict1,**dict2)'  100000 loops, best of 3: 6.94 usec per loop$ python -m timeit -s 'dict1=dict2=dict((i,i) for i in range(100))' 'dictMerged3=dict(dict1)' 'dictMerged3.update(dict2)'  100000 loops, best of 3: 7.09 usec per loop$ python -m timeit -s 'dict1=dict2=dict((i,i) for i in range(100))' 'dictMerged4=dict1.copy()' 'dictMerged4.update(dict2)'  100000 loops, best of 3: 6.73 usec per loop

I hope this article will help you with Python programming.

Combine the two dictionaries in python

Dict1 = {'1': ('A', 'B', 'C', 'D'), '2': ('F', 'w ', 'M'), '3' :( 'P', 'l', 'w ')}
Dict2 = {'1': ('B', 'w', 'q'), '2' :( 'I', 'z', 'M '), '3' :( 'P', 'w', 'O ')}

Dict = {}
For key in dict1.keys ():
Dict [key] = list (dict1 [key])

For key in dict2.keys ():
If dict. has_key (key ):
# Append
For v in dict2 [key]:
If not v in dict [key]:
Dict [key]. append (v)
Else:
Dict [key] = list (dict2 [key])

Print dict

Python combines two dictionaries into one.

Dict1 = {'1': ('A', 'B', 'C', 'D'), '2': ('F', 'w ', you probably haven't run the content in python at all, have you? Let's see the two dictionaries I have changed.