multi_row"
"where row_id < 5"
"order by age")
print(multistr)
select * from multi_rowwhere row_id <...5order by age
5、存储列表元素到新的变量
testList = [1, 2, 3]
x, y, z = testList # 变量个数应该和列表长度严格一致
print(x, y,...python中的对象
test = [1, 3, 5, 7]
print(dir(test))
['add', 'class', 'contains', 'delattr', 'delitem', 'dir...x = 1200
print(sys.getrecursionlimit())
sys.setrecursionlimit(x)
print(sys.getrecursionlimit())
24、检查一个对象的内存使用...import sys
x = 1
print(sys.getsizeof(x)) # python3.5中一个32比特的整数占用28字节
25、使用slots减少内存开支
import sys
