Python 字典清除()
clear()方法从字典中移除所有项目。
语法:
dict.clear()
参数:
The clear() method doesn't take any parameters.
返回:
The clear() method doesn't return any value.
示例:
Input : d = {1: "geeks", 2: "for"}
d.clear()
Output : d = {}
错误:
As we are not passing any parameters there
is no chance for any error.
# Python program to demonstrate working of
# dictionary clear()
text = {1: "geeks", 2: "for"}
text.clear()
print('text =', text)
输出:
text = {}
和给字典分配{}有什么不同？ 请参考下面的代码来看看区别。当我们将{}分配给字典时，会创建一个新的空字典并将其分配给引用。但是当我们清除了一个字典引用时，实际的字典内容就被删除了，所以所有引用字典的引用都变成了空的。
# Python code to demonstrate difference
# clear and {}.
text1 = {1: "geeks", 2: "for"}
text2 = text1
# Using clear makes both text1 and text2
# empty.
text1.clear()
print('After removing items using clear()')
print('text1 =', text1)
print('text2 =', text2)
text1 = {1: "one", 2: "two"}
text2 = text1
# This makes only text1 empty.
text1 = {}
print('After removing items by assigning {}')
print('text1 =', text1)
print('text2 =', text2)
输出:
After removing items using clear()
text1 = {}
text2 = {}
After removing items by assigning {}
text1 = {}
text2 = {1: 'one', 2: 'two'}
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