clear()方法從字典中刪除所有項目。
用法:
dict.clear()
參數：
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 = {}
錯誤：
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)輸出：
text = {}
與將{}分配給字典有什麽不同？
請參考下麵的代碼以查看區別。當我們將{}分配給字典時，將創建一個新的空字典並將其分配給引用。但是，當我們確實清除字典引用時，實際的字典內容將被刪除，因此所有引用字典的引用都將變為空。
# 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)輸出：
After removing items using clear()
text1 = {}
text2 = {}
After removing items by assigning {}
text1 = {}
text2 = {1:'one', 2:'two'}
相關用法
注：本文由純淨天空篩選整理自pawan_asipu大神的英文原創作品 Python Dictionary clear()。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。