比较 Python 中的两个字典
Najwa Riyaz
2023年1月30日
本文将介绍如何在 Python 中比较两个字典。
在 Python 中使用 == 运算符比较两个字典
Python 中的 == 运算符可用于确定字典是否相同。
这是存在相同字典时的示例。
dict1 = dict(name="Tom", Vehicle="Benz Car")
dict2 = dict(name="Tom", Vehicle="Benz Car")
dict1 == dict2
输出：
True
这是一个例子，当有不同的字典时 -
dict1 = dict(name="John", Vehicle="Benz Car")
dict2 = dict(name="Tom", Vehicle="Benz Car")
dict1 == dict2
输出：
False
你可以比较以下示例中提到的许多字典，
dict1 = dict(name="John", Vehicle="Benz Car")
dict2 = dict(name="Tom", Vehicle="Benz Car")
dict3 = dict(name="Shona", Vehicle="Alto Car")
dict4 = dict(name="Ruby", Vehicle="Honda Car")
dict1 == dict2 == dict3 == dict4
输出：
False
编写自定义代码来比较 Python 中的两个字典
以下是如何编写代码来比较字典并确定字典之间共有多少对。下面是步骤。
-
使用
for循环遍历其中一个字典中的每个项目。根据共享索引将此字典的每个项目与另一个字典进行比较。 -
如果项目相等，则将
key:value对放入结果共享字典中。 -
遍历整个字典后，计算结果共享字典的长度以确定字典之间的公共项数。
下面是一个示例，演示了在 Python 中比较两个字典的方法。
在这种情况下，字典是相同的。
dict1 = dict(name="Tom", Vehicle="Mercedes Car")
dict2 = dict(name="Tom", Vehicle="Mercedes Car")
dict1_len = len(dict1)
dict2_len = len(dict2)
total_dict_count = dict1_len + dict2_len
shared_dict = {}
for i in dict1:
if (i in dict2) and (dict1[i] == dict2[i]):
shared_dict[i] = dict1[i]
len_shared_dict = len(shared_dict)
print("The items common between the dictionaries are -", shared_dict)
print("The number of items common between the dictionaries are -", len_shared_dict)
if len_shared_dict == total_dict_count / 2:
print("The dictionaries are identical")
else:
print("The dictionaries are non-identical")
输出：
The items common between the dictionaries are - {'name': 'Tom', 'Vehicle': 'Mercedes Car'}
The number of items common between the dictionaries are - 2
The dictionaries are identical
接下来，让我们尝试一个字典不相同的例子——
dict1 = dict(name="Tom", Vehicle="Alto Car")
dict2 = dict(name="Tom", Vehicle="Mercedes Car")
dict1_len = len(dict1)
dict2_len = len(dict2)
total_dict_count = dict1_len + dict2_len
shared_dict = {}
for i in dict1:
if (i in dict2) and (dict1[i] == dict2[i]):
shared_dict[i] = dict1[i]
len_shared_dict = len(shared_dict)
print("The items common between the dictionaries are -", shared_dict)
print("The number of items common between the dictionaries are -", len_shared_dict)
if len_shared_dict == total_dict_count / 2:
print("The dictionaries are identical")
else:
print("The dictionaries are non-identical")
输出：
The items common between the dictionaries are - {'name': 'Tom'}
The number of items common between the dictionaries are - 1
The dictionaries are non-identical