数据类型:
数据类型的bool值:
'''
Nonetype:
None ->False
Number:
int: 0 ->False; else->True
float: 0.0 ->Flase; else->True
bool: False ->False; else->True
complex: 0+0j ->False; else->True
String:
''->False '0'->True
List:
[]->False [0]->True
Tuple:
()->False (0,)->True
Set:
set()->False {0}->True
Dictionary:
{}->False {0:0}->True
'''