怎么做 - python字典遍历和搜索

my_dict = {'a': 1, 'b': 2, 'c': 3}

for key, value in my_dict.items():
    print(key, value)

a 1
b 2
c 3

my_dict = {'a': 1, 'b': 2, 'c': 3}

key_to_find = 'b'

if key_to_find in my_dict:
    print(f"The value for key '{key_to_find}' is {my_dict[key_to_find]}")
else:
    print(f"Key '{key_to_find}' not found in the dictionary")

The value for key 'b' is 2

my_dict = {'a': 1, 'b': 2, 'c': 3}

value_to_find = 2

keys_with_value = [key for key, value in my_dict.items() if value == value_to_find]

if keys_with_value:
    print(f"The keys with value {value_to_find} are {keys_with_value}")
else:
    print(f"No keys found with value {value_to_find}")

The keys with value 2 are ['b']