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在下面的代碼,爲什麼會設置在課堂測試1的email_attachments列表「attach1」也設置在課堂test2將「attach1」的email_attachments名單?爲什麼設定一個Python 2.7列表跨階級界限
類別:
class classtest:
smtp_server = ""
smtp_port = 0
email_attachments = []
def class_print(self):
print self.smtp_server
print self.smtp_port
print self.email_attachments
腳本:
import ClassTest
def main():
test1 = ClassTest.classtest()
test1.smtp_server = "server1"
test1.smtp_port = "1"
test1.email_attachments.append("attach1")
test1.class_print()
print
test2 = ClassTest.classtest()
test2.smtp_server = "server2"
test2.class_print()
main()
結果:
server1的
[ 'attach1']
server2的
[「attach1」]