How can I merge two dictionaries in Python?
You can use the update()
method or the **
unpacking operator to merge dictionaries in Python.
Can you show me an example using both methods?
Sure! Using update()
:
dict1 = {'a': 1, 'b': 2}
dict2 = {'b': 3, 'c': 4}
dict1.update(dict2)
print(dict1) # Output: {'a': 1, 'b': 3, 'c': 4}
And using **
unpacking:
merged_dict = {**dict1, **dict2}
print(merged_dict) # Output: {'a': 1, 'b': 3, 'c': 4}
What if there are duplicate keys?
In case of duplicate keys, the values from the second dictionary will overwrite those from the first.
Is there a way to merge dictionaries without losing any data?
You can merge dictionaries and keep all values in a list for duplicate keys. Here's an example:
from collections import defaultdict
merged = defaultdict(list)
for d in [dict1, dict2]:
for key, value in d.items():
merged[key].append(value)
print(dict(merged)) # Output: {'a': [1], 'b': [2, 3], 'c': [4]}
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