比较 Python 中的两个字典
Najwa Riyaz
2023年1月30日
2021年7月9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