如何使用字符串查找特定的python字典键

my_dict = {'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}
search_key = 'key2'

if search_key in my_dict:
    print(f"The key '{search_key}' is present in the dictionary.")
else:
    print(f"The key '{search_key}' is not present in the dictionary.")

my_dict = {'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}
search_key = 'key2'

value = my_dict.get(search_key)

if value is not None:
    print(f"The value of the key '{search_key}' is '{value}'.")
else:
    print(f"The key '{search_key}' is not present in the dictionary.")

my_dict = {'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}
search_key = 'key2'

try:
    value = my_dict[search_key]
    print(f"The value of the key '{search_key}' is '{value}'.")
except KeyError:
    print(f"The key '{search_key}' is not present in the dictionary.")