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Fixed in 2019.1.X
Fixed in 2017.4.X, 2018.1.X, 2019.2.X
Votes
14
Found in
2017.3.0f3
2019.1
Issue ID
987230
Regression
Yes
[Linux] keystrokes recorded twice
-e: when typing into input fields each letter is recorded twice for each key stroke
--works well in 2017.1.2p4., 2017.2.1p1, stops working in 2017.3.0f3
-repro:
--open attached project
--build linux standalone
--run build
--enter something into either input field
--NOTICE the letters being written twice
Comments (2252)
-
hasseebhasseeb786786
Aug 31, 2024 11:17
Using collections.ChainMap (Python 3.3+)
The ChainMap class from the collections module can also be used to merge dictionaries. It provides a view that groups multiple dictionaries together, allowing you to access keys from multiple dictionaries in a single view. However, it does not create a new dictionary but rather presents a combined view of the original dictionaries.Here's an example:
python
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from collections import ChainMapdict1 = {'a': 1, 'b': 2, 'c': 3}
dict2 = {'b': 4, 'c': 5, 'd': 6}# Merging dictionaries using ChainMap
merged = ChainMap(dict1, dict2)
print(dict(merged))
Output:python
Copy code
{'a': 1, 'b': 2, 'c': 3, 'd': 6}
In this example, ChainMap gives precedence to dict1 for duplicate keys, which might not be the desired behavior if you want the second dictionary’s values to take priority.Conclusion
Merging dictionaries in Python is a common task with several effective methods. Depending on the version of Python you're using and your specific needs, you can choose between the update() method, dictionary unpacking, the | operator, or ChainMap. Each method has its own advantages, so selecting the right one depends on your requirements for readability, performance, and compatibility.By understanding these different techniques, you can efficiently manage and combine dictionaries in your Python applications.
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hasseebhasseeb786786
Aug 31, 2024 11:17
In this example, dict1 is updated with the contents of dict2. As a result, the values for keys 'b' and 'c' in dict1 are replaced by those in dict2.
Dictionary Unpacking (Python 3.5+)
With the introduction of Python 3.5, dictionary unpacking became available. This feature allows you to merge dictionaries using the ** operator. It provides a more concise and readable syntax compared to update().Here's how you can use dictionary unpacking:
python
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dict1 = {'a': 1, 'b': 2, 'c': 3}
dict2 = {'b': 4, 'c': 5, 'd': 6}# Merging dictionaries using unpacking
merged_dict = {**dict1, **dict2}
print(merged_dict)
Output:python
Copy code
{'a': 1, 'b': 4, 'c': 5, 'd': 6}
In this case, the ** operator is used to unpack the key-value pairs from both dictionaries into a new dictionary. The values from dict2 overwrite those in dict1 if keys are duplicated.Using the dict() Constructor (Python 3.9+)
Starting from Python 3.9, you can use the | operator to merge dictionaries. This method is both intuitive and expressive, offering a clear and straightforward way to combine dictionaries.Here's an example:
python
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dict1 = {'a': 1, 'b': 2, 'c': 3}
dict2 = {'b': 4, 'c': 5, 'd': 6}# Merging dictionaries using the | operator
merged_dict = dict1 | dict2
print(merged_dict)
Output:python
Copy code
{'a': 1, 'b': 4, 'c': 5, 'd': 6}
The | operator performs a union of dictionaries, with values from the second dictionary taking precedence in case of key collisions. -
hasseebhasseeb786786
Aug 31, 2024 11:16
Merging Dictionaries in Python: A Comprehensive Guide
In Python, dictionaries are versatile data structures that store key-value pairs. Occasionally, you might need to combine two dictionaries into one. This can be particularly useful when aggregating data or updating existing records. In this article, we'll explore various methods for merging dictionaries in Python, ensuring you can choose the approach that best suits your needs.Basic Dictionary Merge: update() Method
The simplest way to merge two dictionaries is by using the update() method. This method updates the dictionary with elements from another dictionary object or from an iterable of key-value pairs. If a key is present in both dictionaries, the value from the second dictionary will overwrite the value -
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Resolution Note (fix version 2019.1):
Fixed keystrokes from being recorded twice while using text fields in play mode in the editor.