Python 字典复制与 = 运算符之间的区别

在本节中，我们将通过实际示例讨论 Python 字典复制与 = 运算符之间的区别。Python 字典复制（浅拷贝）将字典项复制到一个全新的字典中。而 = 运算符则创建现有字典的一个实例。

Python 字典复制与 = 运算符之间的区别 示例 1

在此示例中，我们展示了如何使用这两个选项将字典项复制到一个新字典中。如您所见，这两个 Python 代码都给出了相同的结果。

# Difference between Python Dictionary copy and = Operator

emp = {'name': 'John', 'age': 25 , 'job': 'HR', 'Sal': 725000}

print("Dictionary: ", emp)
print("Dictionary Length: ", len(emp))

newEmp = emp.copy()
print("\nDictionary: ", newEmp)
print("Dictionary Length: ", len(newEmp))

newEmp2 = emp
print("\nDictionary: ", newEmp2)
print("Dictionary Length: ", len(newEmp2))

字典复制与 = 运算符的输出

Dictionary:  {'name': 'John', 'age': 25, 'job': 'HR', 'Sal': 725000}
Dictionary Length:  4

Dictionary:  {'name': 'John', 'age': 25, 'job': 'HR', 'Sal': 725000}
Dictionary Length:  4

Dictionary:  {'name': 'John', 'age': 25, 'job': 'HR', 'Sal': 725000}
Dictionary Length:  4

区分字典复制与 = 运算符 示例 2

在此程序中，我们使用 字典清空 函数从 字典 中删除项。如果您仔细观察，当我们从 emp 中删除项时，newEmp2 也返回一个空集。

# Difference between Python Dictionary copy and = Operator

emp = {'name': 'John', 'age': 25 , 'job': 'HR', 'Sal': 725000}

print("Dictionary: ", emp)
print("Dictionary Length: ", len(emp))

newEmp = emp.copy()
print("\nDictionary: ", newEmp)
print("Dictionary Length: ", len(newEmp))

newEmp2 = emp
print("\nDictionary: ", newEmp2)
print("Dictionary Length: ", len(newEmp2))

emp.clear()
print("\nDictionary: ", newEmp)
print("Dictionary Length: ", len(newEmp))

print("\nDictionary: ", newEmp2)
print("Dictionary Length: ", len(newEmp2))
Difference between Python Dictionary copy and = Operator Example