Last modified on 01 Oct 2021.
Checking
# check if empty
bool(my_dict) # False if empty
Creating
# empty dict
my_dict = {}
# integer keys
my_dict = {1: "a", 2: 3}
# contains complicated types
my_dict = {1: ["1", "2"], "2": {1: 1, 2: 2}, 3: (1, 2)}
Updating
d = {1: "one", 2: "three"}
d1 = {2: "two"}
# update value of key "2"
d.update(d1)
# add new key "3"
d2 = {3: "three"}
d.update(d2)
Access elements
my_dict = {1: "a", 2: "b"}
my_dict[1]
my_dict.keys()
my_dict.values()
my_dict.items()
'a'
dict_keys([1, 2])
dict_values(['a', 'b'])
dict_items([(1, 'a'), (2, 'b')])
for key, val in my_dict.items():
print(key, val)
1 a
2 b
If the key doesn’t exist, use the default!
dct = {1: 'a', 2: 'b'}
dct.get(1)
dct.get(3, 'c')
'a'
'c'
Sorted keys
for key in sorted(my_dict.keys()):
pass
•Notes with this notation aren't good enough. They are being updated. If you can see this, you are so smart. ;)