clear()方法从字典中删除所有项目。
用法:
dict.clear()
参数：
The clear() method doesn't take any parameters.
返回值：
The clear() method doesn't return any value.
例子：
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 = {}
与将{}分配给字典有什么不同？
请参考下面的代码以查看区别。当我们将{}分配给字典时，将创建一个新的空字典并将其分配给引用。但是，当我们确实清除字典引用时，实际的字典内容将被删除，因此所有引用字典的引用都将变为空。
# 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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注：本文由纯净天空筛选整理自pawan_asipu大神的英文原创作品 Python Dictionary clear()。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。