# ###Number 强制类型转换
var1 = 5
var2 = 4.85
var3 = True
var3_2 = False
var4 = 3+9j
var5 = "888777"
var6 = "sdjh24+"
#(1) int 强制转换整型
res = int(var1)
print(res)
res = int(var2)
print(res)
res = int(var3)
print(res)
res = int(var3_2)
print(res)
# res = int(var4)
# print(res)
res = int(var5)
print(res)
# res = int(var6) error
# print(res)
# (2)float 强制转换浮点型
res = float(var1)
res =float(var2)
res = float(var3)
res =float(var3_2)
#res = float(var4)error
res =float(var5)
print(res)
#(3)complex 强制转换成复数
res = complex(var1)
res = complex(var2)
res = complex(var3)
res = complex(False)
res = complex(var5)
print(res)
#(4) bool 强制转换成布尔类型,结果只有两种,要么True 要么False
"""bool 可以转换所有的数据类型 everything"""
res = bool(var1)
res = bool(var2)
res = bool(var6)
print(res)
"""
布尔类型为假的十种情况:0 ,0.0 , 0j ,False,(), [], set, {},None
"""
#None 是系统的关键字,代表什么也没有,一般用于初始化变量的时候用
res = None
print(None)